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An updated generic classification of Cenozoic pleurotomariid gastropods, with new records from the Oligocene and early Miocene of India J. Paleontol (IF 1.653) Pub Date : 2021-03-03 Kanishka Bose; Shiladri S. Das; Subhronil Mondal
Although taxonomically distinct, the Cenozoic pleurotomariids are the bottlenecked remnants of the Mesozoic members of the family in terms of morphology, with only conical forms surviving the end-Cretaceous mass extinction. Here, we propose an updated classification scheme for the Cenozoic representatives of this group, based on data from the entire Cenozoic pleurotomariid fossil record. We consider
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Biostratigraphy and taxonomy of fusulinid foraminifera across the Upper Mississippian (upper Serpukhovian)–Lower Pennsylvanian (Bashkirian) successions from the Hadim Nappe, Central Taurides, southern Turkey J. Paleontol (IF 1.653) Pub Date : 2021-02-23 Melikan Akbaş; Cengiz Okuyucu
The Hadim Nappe, which is one of the allochthonous tectonic units in the Tauride Belt, in southern Turkey, includes a continuous stratigraphic succession from the Middle(?)–Late Devonian to Late Cretaceous. A relatively complete succession of the upper Serpukhovian to Bashkirian is exposed in the Central Taurides, where two sections (Yassıpınar and Gölbelen) have been selected for detailed biostratigraphic
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Early Cambrian (Stage 4) brachiopods from the Shipai Formation in the Three Gorges area of South China J. Paleontol (IF 1.653) Pub Date : 2021-02-22 Xiaolin Duan; Marissa J. Betts; Lars E. Holmer; Yanlong Chen; Fan Liu; Yue Liang; Zhifei Zhang
Diverse and abundant fossil taxa have been described in the lower Cambrian Shipai Formation in the Three Gorges area of Hubei Province, South China, but the taxonomy and diversity of the co-occurring brachiopod fauna are still far from clear. Here we describe the brachiopod fauna recovered from the Shipai Formation in the Three Gorges area of South China, including representatives of the subphylum
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The first record of floor plates in pinnules and the earliest record of an anitaxis in rhodocrinitid diplobathrid camerate crinoids J. Paleontol (IF 1.653) Pub Date : 2021-02-22 Thomas E. Guensburg
Restudy of Proexenocrinus inyoensis Strimple and McGinnis, 1972, shows that this earliest-known rhodocrinitid diplobathrid camerate crinoid (late Floian, Early Ordovician) expresses the only known record of ambulacral floor plates within pinnules. These pinnule floor plates are remarkably conserved plesiomorphic expressions, with anatomy similar to floor plates of some of the earliest pentaradiate
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Lower Famennian (Upper Devonian) rhynchonellide and athyride brachiopods from the South Armenian Block J. Paleontol (IF 1.653) Pub Date : 2021-02-18 Vahram Serobyan; Taniel Danelian; Catherine Crônier; Araik Grigoryan; Bernard Mottequin
The lower Famennian ‘Cyrtospirifer’ orbelianus brachiopod Zone established in Armenia by Abrahamyan (1957) (coeval to the crepida conodont Zone) contains an abundant and diverse brachiopod fauna that still remains poorly studied. In an effort to revise and update its systematic classification and to assess the brachiopod diversity in this area after the Kellwasser extinction event at the end of the
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Ediacaran metazoan fossils with siliceous skeletons from the Digermulen Peninsula of Arctic Norway J. Paleontol (IF 1.653) Pub Date : 2021-02-10 Małgorzata Moczydłowska; Benjamin P. Kear; Daniel Snitting; Lei Liu; Peter Lazor; Jarosław Majka
In this study, a new assemblage of Ediacaran metazoan fossils is reported from the basal Stáhpogieddi Formation on the Digermulen Peninsula of Arctic Norway, including Anulitubus n. gen. Moczydłowska in Moczydłowska et al., Anulitubus formosus n. gen. n. sp. Moczydłowska in Moczydłowska et al., Coniculus n. gen. Moczydłowska in Moczydłowska et al., Coniculus elegantis n. gen. n. sp. Moczydłowska in
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Glossifungites gingrasi n. isp., a probable subaqueous insect domicile from the Cretaceous Ferron Sandstone, Utah J. Paleontol (IF 1.653) Pub Date : 2021-01-25 M. Ryan King; Andrew D. La Croix; Terry A. Gates; Paul B. Anderson; Lindsay E. Zanno
A new ichnospecies, Glossifungites gingrasi n. isp., is described from multiple locations in basal sand-filled coastal plain distributary channels of the Turonian (Upper Cretaceous) Ferron Sandstone (central Utah). Glossifungites gingrasi n. isp. is attributed to the ichnogenus Glossifungites based on the presence of scratch imprints, passive fill, and a tongue-shaped structure, yet the new ichnospecies
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Three new cribrimorph bryozoans (order Cheilostomatida) from the early Miocene of Argentina, with a discussion on spinocystal shield morphologies J. Paleontol (IF 1.653) Pub Date : 2021-01-25 Juan López-Gappa; Leandro M. Pérez; Ana C.S. Almeida; Débora Iturra; Dennis P. Gordon; Leandro M. Vieira
Bryozoans with calcified frontal shields formed by the fusion of costae, collectively constituting a spinocyst, are traditionally assigned to the family Cribrilinidae. Today, this family is regarded as nonmonophyletic. In the Argentine Cenozoic, cribrilinids were until recently represented by only two fossil species from the Paleocene of Patagonia. This study describes the first fossil representatives
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Brachial supporting structure of Spiriferida (Brachiopoda) J. Paleontol (IF 1.653) Pub Date : 2020-12-28 Zhiwei Yuan; Wen Guo; Dan Lyu; Yuanlin Sun
The filter-feeding organ of some extinct brachiopods is supported by a skeletal apparatus called the brachidium. Although relatively well studied in Atrypida and Athyridida, the brachidial morphology is usually neglected in Spiriferida. To investigate the variations of brachidial morphology in Spiriferida, 65 species belonging to eight superfamilies were analyzed. Based on the presence/absence of the
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A new cobia (Teleostei, Rachycentridae) species from the Miocene St. Marys Formation along Calvert Cliffs, Maryland, USA J. Paleontol (IF 1.653) Pub Date : 2020-12-28 Stephen J. Godfrey; Giorgio Carnevale
The highly fossiliferous St. Marys Formation is exposed along Calvert Cliffs, Maryland, and comprises one of the best available records of late Miocene life in the northeastern United States. Rachycentron stremphaencus new species, a cobia from the late Miocene (Tortonian) of the St. Marys Formation is described herein on the basis of a single three-dimensional neurocranium. This fossil represents
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A new, giant ricinuleid (Arachnida, Ricinulei), from the Pennsylvanian of Illinois, and the identification of a new, ontogenetically stable, diagnostic character J. Paleontol (IF 1.653) Pub Date : 2020-12-23 Niall Whalen; Paul Selden
A new fossil ricinuleid, Curculioides bohemondi n. sp., from the Pennsylvanian Energy Shale of Illinois is described from a single specimen. It is the largest ricinuleid species yet described, living or extinct. The Energy Shale represents a new geographic locale for fossil ricinuleids, a sparsely distributed group. The species is distinguished from other members within the genus by the possession
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Diversity and systematics of Middle-Late Ordovician calcified cyanobacteria and associated microfossils from Ordos Basin, North China J. Paleontol (IF 1.653) Pub Date : 2020-10-19 Lijing Liu; Yasheng Wu; Hongping Bao; Hongxia Jiang; Lijing Zheng; Yanlong Chen
Calcified cyanobacteria are of considerable research value for reconstructing the ecology of Paleozoic and Mesozoic benthic communities on carbonate platforms due to their ability to produce oxygen and fix nitrogen and CO2. The diversity and abundance of calcified cyanobacteria was initially suggested to have declined in the Middle and Late Ordovician, although more recent work suggests that complex
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New insights on the Early Pleistocene equids from Roca-Neyra (France, central Europe): implications for the Hipparion LAD and the Equus FAD in Europe J. Paleontol (IF 1.653) Pub Date : 2020-12-17 Omar Cirilli; Raymond L. Bernor; Lorenzo Rook
We undertake a redescription of the equid sample from the Early Pleistocene of Roca-Neyra, France. This locality has been recently calibrated at the Pliocene/Pleistocene boundary (2.6 ± 0.2 Ma) and therefore it is of interest for the first appearance of the genus Equus and last appearance of hipparionine horses. The Roca-Neyra equid sample, re-analyzed herein using morphological, morphometrical, and
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Oriostoma (Gastropoda) with an in situ operculum from the Silurian of Indiana J. Paleontol (IF 1.653) Pub Date : 2020-12-15 David M. Rohr; Gregory P. Wahlman
A single specimen of Oriostoma globosum (von Schlotheim, 1820) from the Silurian-age (Wenlockian) Laurel Limestone in southeastern Indiana preserves a partial, multispiral operculum in situ within the aperture. Only eight specimens of in situ Oriostoma opercula have previously been illustrated from Canada and Europe, and this is the first from the United States. Oriostoma huntingtonensis Kindle, 1904
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Phylogeny and biogeography of some Cretaceous spatangoid echinoids with special emphasis on taxa from the Western Interior Seaway J. Paleontol (IF 1.653) Pub Date : 2020-12-15 Steven Byrum; Bruce S. Lieberman
Members of the echinoid order Spatangoida, a highly diverse and abundant marine invertebrate clade, were important denizens of the Cretaceous Western Interior Seaway (WIS), an epicontinental seaway that divided North America in two during an interval of greenhouse conditions between roughly 100 and 65 million years ago. A phylogenetic analysis of spatangoids was conducted using a character matrix of
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Permian millipedes from the Fort Sill fissures of southwestern Oklahoma, with comments on allied taxa and millipedes preserved in karstic environments J. Paleontol (IF 1.653) Pub Date : 2020-12-10 Joseph T. Hannibal; William J. May
Permian millipedes are rare, especially so considering the relative abundance of millipedes in Carboniferous rocks. We report an early Permian millipede fauna containing three new genera and species of millipedes (Oklahomasoma richardsspurense new genus new species, Karstiulus fortsillensis new genus new species, and Dolesea subtila new genus new species) found in fossil-producing pockets of the Fort
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A new dissorophoid temnospondyl from the Allegheny Group (late Carboniferous) of Five Points, Mahoning County, Ohio (USA) J. Paleontol (IF 1.653) Pub Date : 2020-12-07 Rainer R. Schoch; Amy C. Henrici; Robert W. Hook
A small temnospondyl skull from the upper Carboniferous Allegheny Group of Five Points, Ohio, is referred to a new dissorophoid, Palodromeus bairdi n. gen n. sp. The complete skull with mandibles is preserved in counterparts. It is characterized by, (1) elongated slit-like choana; (2) postfrontal, postorbital, and supratemporal bearing a distinct ridge; and (3) reduced parietal only two-thirds the
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New Thylacocephala (Crustacea) assemblage from the Spathian (Lower Triassic) of Majiashan (Chaohu, Anhui Province, South China) J. Paleontol (IF 1.653) Pub Date : 2020-12-03 Cheng Ji; Andrea Tintori; Dayong Jiang; Ryosuke Motani; Federico Confortini
Here we report and describe a new assemblage of Thylacocephala (Crustacea) from the late Spathian (Early Triassic) of Chaohu, Anhui Province, South China. The assemblage consists of at least three species from different genera: the small-sized Microcaris rectilineatus n. sp. appears the most abundant, while the large-sized Ankitokazocaris sp. and Diplacanthocaris chaohuensis n. gen. n. sp. are rare
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Spiracarneyella, a new carneyellid edrioasteroid from the Upper Ordovician (Katian) of Kentucky and Ohio and comments on carneyellid heterochrony J. Paleontol (IF 1.653) Pub Date : 2020-12-03 Colin D. Sumrall; Daniel Phelps
A new genus and species of carneyellid edrioasteroid, Spiracarneyella florencei n. gen. n. sp., is described from the Upper Ordovician (Kaitian) Point Pleasant Formation of northern Kentucky and southern Ohio. Spiracarneyella n. gen. is characterized by having all five ambulacra curving clockwise around the theca, having small node-bearing interambulacral plates in the distal interambulacra, and having
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Arnebolagus, the oldest eulagomorph, and phylogenetic relationships within the Eocene Eulagomorpha new clade (Mammalia, Duplicidentata) J. Paleontol (IF 1.653) Pub Date : 2020-11-23 Alexey V. Lopatin; Alexander O. Averianov
Arnebolagus leporinus Lopatin and Averianov, 2008, known previously from a single tooth (P3) from the early Eocene Bumban Member of Naran Bulak Formation at Tsagan-Khushu locality in Mongolia, is redescribed based on additional specimens from the type locality. Phylogenetic relationships of Eocene stem lagomorphs from Asia and North America are reconstructed for the first time based on a parsimony
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Cribrilinid bryozoans from Pleistocene Mediterranean deep-waters, with the description of new species J. Paleontol (IF 1.653) Pub Date : 2020-11-23 Antonietta Rosso; Emanuela Di Martino; Andrew N. Ostrovsky
Cribrilinid bryozoans originating from Pleistocene deep-water sediments from two localities near Messina (Sicily, Italy)—Capo Milazzo (Gelasian) and Scoppo (Calabrian)—were examined. Five cribrilinid species were found, three in each locality and time interval, with only one species shared. Three species, Cribrilaria profunda n. sp., Glabrilaria transversocarinata n. sp., and Figularia spectabilis
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A probable skeleton of Isisfordia (Crocodyliformes) and additional crocodyliform remains from the Griman Creek Formation (Cenomanian, New South Wales, Australia) J. Paleontol (IF 1.653) Pub Date : 2020-11-20 Lachlan J. Hart; Phil R. Bell; Elizabeth T. Smith; D. Rex Mitchell; Tom Brougham; Steven W. Salisbury
The sparse record of Cretaceous crocodyliforms in Australia comprises only three species, all within the genus Isisfordia. Isisfordia duncani Salisbury et al., 2006 is from the Albian–Turonian Winton Formation of Queensland, and both Isisfordia molnari Hart et al., 2019 and Isisfordia selaslophensis Etheridge, 1917 have been described from opalized material from the Cenomanian Griman Creek Formation
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Bryozoans from the lower Silurian (Telychian) Hanchiatien Formation from southern Chongqing, South China J. Paleontol (IF 1.653) Pub Date : 2020-11-16 Andrej Ernst; Qi-Jian Li; Min Zhang; Axel Munnecke
Eight bryozoan species are described from the Hanchiatien Formation (lower Silurian, Telychian) of southern Chongqing, South China. Four species are new: the trepostomes Asperopora sinensis n. sp., Trematopora jiebeiensis n. sp., and Trematopora tenuis n. sp., and the fenestrate Moorephylloporina parvula n. sp. One species, the cystoporate Hennigopora sp. indet., is described in open nomenclature.
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New cynodonts (Therapsida, Eucynodontia) from the Late Triassic of India and their significances J. Paleontol (IF 1.653) Pub Date : 2020-11-16 Mohd Shafi Bhat; Sanghamitra Ray; P. M. Datta
The Upper Triassic Tiki Formation of India has yielded several new cynodont taxa, which are described on the basis of multiple isolated teeth and a jaw fragment. A new species of dromatheriid, Rewaconodon indicus, is defined by a tri- and tetracuspid asymmetric crown, long anterior edge of the major cusp a, cingular cusps d and f, and marked constriction at the crown-root junction. Another new dromatheriid
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A new early-diverging sphenodontian (Lepidosauria, Rhynchocephalia) from the Upper Triassic of Virginia, U.S.A. J. Paleontol (IF 1.653) Pub Date : 2020-11-10 Hans-Dieter Sues; Rainer R. Schoch
A new taxon of sphenodontian reptile, Micromenodon pitti new genus new species is described from the Upper Triassic (Carnian) Vinita Formation of the Richmond basin of the Newark Supergroup in Virginia. It is diagnosed by a dorsoventrally deep facial process of the maxilla that extends for almost the entire anteroposterior length of the bone and by obtusely conical, strongly ribbed additional teeth
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Articulated trilobite ontogeny: suggestions for a methodological standard J. Paleontol (IF 1.653) Pub Date : 2020-11-05 Nigel C. Hughes; Jonathan M. Adrain; James D. Holmes; Paul S. Hong; Melanie J. Hopkins; Jin-Bo Hou; Alessandro Minelli; Tae-Yoon S. Park; John R. Paterson; Jin Peng; Mark Webster; Xi-Guang Zhang; Xing-Liang Zhang; Giuseppe Fusco
In order to maximize the utility of future studies of trilobite ontogeny, we propose a set of standard practices that relate to the collection, nomenclature, description, depiction, and interpretation of ontogenetic series inferred from articulated specimens belonging to individual species. In some cases, these suggestions may also apply to ontogenetic studies of other fossilized taxa.
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Ediacaran diversity and paleoecology from central Iran J. Paleontol (IF 1.653) Pub Date : 2020-11-05 Seyed Hamid Vaziri; Mahmoud Reza Majidifard; Simon A.F. Darroch; Marc Laflamme
The late Ediacaran (Nama) Fossil Assemblage from the Kushk Series in the Kushk and Chahmir areas of Central Iran highlights a diverse community of globally distributed, soft-bodied (non-skeletonized) Ediacara biota coexisting with skeletonized tubular forms of likely metazoan affinities. Several biostratigraphically and biogeographically important taxa are reported (i.e., erniettomorphs, rangeomorphs
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Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms J. Paleontol (IF 1.653) Pub Date : 2020-11-03 Thomas E. Guensburg; James Sprinkle; Rich Mooi; Bertrand Lefebvre
Twelve specimens of Eumorphocystis Branson and Peck, 1940 provide the basis for new findings and a more informed assessment of whether this blastozoan (a group including eocrinoids, blastoids, diploporites, rhombiferans) constitutes the sister taxon to crinoids, as has been recently proposed. Both Eumorphocystis and earliest-known crinoid feeding appendages express longitudinal canals, a demonstrable
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Codium-like taxa from the Silurian of North America: morphology, taxonomy, paleoecology, and phylogenetic affinity J. Paleontol (IF 1.653) Pub Date : 2020-10-29 Steven T. LoDuca; Anthony L. Swinehart; Matthew A. LeRoy; Denis K. Tetreault; Shawn Steckenfinger
A 1901 report by the Smithsonian Custodian of Paleozoic Plants noted that the nonbiomineralized taxa Buthotrephis divaricata White, 1901, B. newlini White, 1901, and B. lesquereuxi Grote and Pitt, 1876, from the upper Silurian of the Great Lakes area, shared key characteristics in common with the extant green macroalga Codium. A detailed reexamination of these Codium-like taxa and similar forms from
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Symbiotic embedment structures in Silurian Caryocrinites (Echinodermata, Rhombifera, Hemicosmitida) J. Paleontol (IF 1.653) Pub Date : 2020-10-21 James R. Thomka; Carlton E. Brett; Donald L. Bissett
A variety of pits representing symbiotic embedments, sometimes associated with pathological deformation in the host, are known from the skeletons of Paleozoic stalked echinoderms. These structures are well known from multiple genera of crinoids and a limited number of blastozoans but have not previously been described in detail from the skeletons of rhombiferans. This is surprising given the abundance
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New Triassic Aviculopectinoidea (Bivalvia), with notes on the taxonomic concept of the superfamily J. Paleontol (IF 1.653) Pub Date : 2020-10-09 Michael Hautmann; Evelyn Friesenbichler; Eugen Grădinaru; Romain Jattiot; Hugo Bucher
We describe two new genera of Triassic Aviculopectinoidea: Cristaflabellum n. gen., which is biconvex and has a strongly plicate shell, and Globodiscus n. gen., which is equiconvex and externally smooth or nearly so. Globodiscus contains the new species G. kiliani n. gen. n. sp. and G. vinzenti n. gen. n. sp. In order to make the taxonomic concept of the superfamily Aviculopectinoidea more consistent
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New onychochilid mollusks from the Middle and Upper Ordovician of Baltica and Laurentia J. Paleontol (IF 1.653) Pub Date : 2020-10-09 Jan Ove R. Ebbestad; Dennis R. Kolata; Mare Isakar
A new sinistrally coiled univalved mollusk Catalanispira n. gen. is described with two species; Catalanispira reinwaldti (Öpik, 1930) from the Middle Ordovician Kõgekallas Formation (Darriwilian) of Estonia and Catalanispira plattevillensis n. gen. n. sp. from the Upper Ordovician Platteville Formation (Sandbian) of northern Illinois, USA. Morphological features include a large, low-trochiform shell
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An elongate hadrosaurid forelimb with biological traces informs the biogeography of the Lambeosaurinae J. Paleontol (IF 1.653) Pub Date : 2020-10-08 Chase Doran Brownstein; Immanuel Bissell
Although the fossil record of the Late Cretaceous eastern North American landmass Appalachia is poor compared to that from the American West, it includes material from surprisingly aberrant terrestrial vertebrates that may represent relictual forms persisting in relative isolation until the end of the Mesozoic. One intriguing question is to what extent eastern and western North American faunas interspersed
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Redescription of †Yanosteus longidorsalis Jin et al., 1995 (Chondrostei, Acipenseriformes, †Peipiaosteidae) from the Early Cretaceous of China J. Paleontol (IF 1.653) Pub Date : 2020-10-08 Eric J. Hilton; Lance Grande; Fan Jin
The family †Peipiaosteidae contains the genera †Peipiaosteus, †Stichopterus, †Spherosteus, †Yanosteus, and †Liaosteus, all from Late Jurassic to Early Cretaceous deposits of China, Russia, Kazakhstan, and Mongolia. Although the family has taxonomically expanded since it was first established for †P. pani Liu and Zhou, 1965, the amount of detailed comparative data for many of the taxa involved is lacking
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Intravital damage to the body of Dickinsonia (Metazoa of the late Ediacaran) J. Paleontol (IF 1.653) Pub Date : 2020-09-02 Andrey Ivantsov; Maria Zakrevskaya; Aleksey Nagovitsyn; Anna Krasnova; Ilya Bobrovskiy; Ekaterina Luzhnaya (Serezhnikova)
Several specimens of Dickinsonia cf. D. menneri, originating from a single burial event at the Lyamtsa locality of the late Ediacaran (Vendian) in the southeastern White Sea area, Russia, represent deviations from normal morphology: a reduction in the total length of the body; the loss of portions of the body; various deformations of the transverse elements, called isomers; and splitting of the longitudinal
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A new crocodylid from the middle Miocene of Kenya and the timing of crocodylian faunal change in the late Cenozoic of Africa J. Paleontol (IF 1.653) Pub Date : 2020-09-08 Adam P. Cossette; Amanda J. Adams; Stephanie K. Drumheller; Jennifer H. Nestler; Brenda R. Benefit; Monte L. McCrossin; Frederick K. Manthi; Rose Nyaboke Juma; Christopher A. Brochu
Brochuchus is a small crocodylid originally based on specimens from the early Miocene of Rusinga Island, Lake Victoria, Kenya. Here, we report occurrences of Brochuchus from several early and middle Miocene sites. Some are from the Lake Victoria region, and others are in the Lake Turkana Basin. Specimens from the middle Miocene Maboko locality form the basis of a new species, Brochuchus parvidens,
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A new species of the gopher Gregorymys (Rodentia, Geomyidae) from the early Oligocene (Arikareean 1) of southern Mexico J. Paleontol (IF 1.653) Pub Date : 2020-08-20 Elizabeth Ortiz-Caballero; Eduardo Jiménez-Hidalgo; Victor M. Bravo-Cuevas
A new species of gopher, Gregorymys mixtecorum n. sp., is described from the Arikareean 1 (early Oligocene) of Oaxaca, southern Mexico. Phylogenetic analysis indicates that it is the sister species of G. veloxikua, which was also recently described from southern Mexico. Both species were collected from sediments of the Chilapa Formation that crop out in northwestern Oaxaca. Gregorymys mixtecorum n
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Early Miocene marsupialiforms, gymnures, and hedgehogs from Ribesalbes-Alcora Basin (Spain) J. Paleontol (IF 1.653) Pub Date : 2020-07-28 Vicente D. Crespo; Francisco J. Goin; Plini Montoya; Francisco J. Ruiz-Sánchez
Materials from the localities of Araia d'Alcora in the Ribesalbes-Alcora Basin (Spain, early Miocene, Biozone C, MN4) have yielded an assemblage of erinaceids and metatherians, relatively rich for an Iberian site. The most common erinaceid is the gymnure Galerix symeonidisi Doukas, 1986, present in almost all of the studied sites. Other erinaceids in the faunal list are possibly an indeterminate species
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The oldest bifoliate cystoporate and two other bryozoan taxa from the Dapingian (Middle Ordovician) of north-western Russia J. Paleontol (IF 1.653) Pub Date : 2020-09-25 Anna V. Koromyslova; Petr V. Fedorov
Bryozoans from the Dapingian (Middle Ordovician) of the Baltic paleobasin remain poorly studied and their taxonomic composition is unclear. In this paper, three bryozoan taxa, a bifoliate cystoporate Planopora volkhovensis n. gen. n. sp., a trepostome Hemiphragma insolitum n. sp., and an esthonioporate Esthoniopora clara Koromyslova, are described from Dapingian deposits of an unusual clayey-calcareous
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Atopidae (Trilobita) in the upper Marianian (Cambrian Series 2, Stage 4) of Iberia J. Paleontol (IF 1.653) Pub Date : 2020-09-22 Luis Collantes; Eduardo Mayoral; Eladio Liñán; Rodolfo Gozalo
New atopid trilobites are described from the early Cambrian Cumbres beds and Herrerías shale of northern Huelva Province (Andalusia, Spain) and are dated as middle–late Marianian (Cambrian Series 2, Stage 4). New specimens of Atops calanus Richter and Richter, 1941 are described and the Laurentian species Pseudatops reticulatus (Walcott, 1890b) is recognized for the first time in the Mediterranean
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First evidence of Lower–?Middle Ordovician (Floian–?Dapingian) brachiopods from the Peruvian Altiplano and their paleogeographical significance J. Paleontol (IF 1.653) Pub Date : 2020-09-22 Jorge Colmenar; Eben Blake Hodgin
The lower strata of the Umachiri Formation from the Altiplano of southeast Peru have yielded a brachiopod-dominated assemblage, containing representatives of the brachiopod superfamilies Polytoechioidea, Orthoidea, and Porambonitoidea, as well as subsidiary trilobite and echinoderm remains. Two new polytoechioid genera and species, Enriquetoechia umachiriensis new genus new species and Altiplanotoechia
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Plectatrypinae and other ribbed atrypides succeeding the end Ordovician extinction event, Central Oslo Region, Norway J. Paleontol (IF 1.653) Pub Date : 2020-09-22 B. Gudveig Baarli
Strata of the Solvik Formation in the central Oslo Region (upper Hirnantian through most of Aeronian) are very fossiliferous and provide a good record relating to the survival and recovery faunas after the end-Ordovician mass extinctions. The ribbed atrypide fauna is especially rich with 21 species present. Samples from most of these taxa have been sectioned to reveal internal structures for taxonomic
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Crinoids from the Lower (Pragian–Emsian) and Middle (early Eifelian) Devonian of Bolivia (Icla and Belén formations, Malvinokaffric Realm) J. Paleontol (IF 1.653) Pub Date : 2020-09-21 Sandro M. Scheffler
Two new families and three new genera and species of Crinoidea from the Icla and Belén formations, Bolivian Devonian, are described. The material is identified as Meperocrinus angelina n. gen. n. sp., from the Icla Formation of the Sub-Andina region, Tuberocrinus lapazensis n. gen. n. sp. and Aenigmaticumcrinus rochacamposi n. gen. n. sp., both from the Belén Formation of the Bolivian Altiplano. Meperocrinus
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First report of acrotretoid brachiopod shell beds in the lower Cambrian (Stage 4) Guanshan Biota of eastern Yunnan, South China J. Paleontol (IF 1.653) Pub Date : 2020-09-09 Xiaolin Duan; Yue Liang; Lars E. Holmer; Zhifei Zhang
Brachiopod shell accumulations are abundant and diverse in the lower Cambrian strata of Yunnan Province, South China, but most commonly they are composed of linguloid and acrotheloid brachiopods. Here, we describe the first record of shell beds with high-density accumulations of microscopic acrotretoid brachiopods (usually <2 mm in width) in the muddy deposits of the Wulongqing Formation (Guanshan
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Late Miocene remains from Venta del Moro (Iberian Peninsula) provide further insights on the dispersal of crocodiles across the late Miocene Tethys J. Paleontol (IF 1.653) Pub Date : 2020-08-19 Massimo Delfino; Àngel H. Luján; Juan Abella; David M. Alba; Madelaine Böhme; Alejandro Pérez-Ramos; Emanuel Tschopp; Jorge Morales; Plini Montoya
The dispersal of Crocodylus from Africa to Europe during the Miocene is not well understood. A small collection of cranial fragments and postcranial elements from the latest Miocene (6.2 Ma) site of Venta del Moro (Valencia, Spain) have previously been referred to Crocodylus cf. C. checchiai Maccagno, 1947 without accompanying descriptions. Here we describe and figure for the first time the crocodylian
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Biostratigraphy, taxonomy and paleobiogeography of the upper Cisuralian (upper Yakhtashian–Bolorian) foraminifers from east-central Iran, with clarification of the taxonomy of the fusulinid genera Cuniculinella and Cuniculina pre-occupied J. Paleontol (IF 1.653) Pub Date : 2020-08-18 Safoora Yasbolaghi Sharahi; Bizhan Yousefi Yeganeh; Sakineh Arefifard; Daniel Vachard; Mohammad Mehdi Farahpour
Detailed studies of upper Cisuralian (i.e., upper lower Permian) fusulinids make it possible to decipher the paleobiogeographic relations of central Iran, as part of the Cimmerian terranes, with other Paleotethyan regions. Two sections, Bagh-e Vang and Shesh Angosht, located in east-central Iran, are revised. Four local fusulinid biozones are distinguished: upper Yakhtashian Pamirina darvasica and
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A new marine woodground ichnotaxon from the Lower Cretaceous Mannville Group, Saskatchewan, Canada J. Paleontol (IF 1.653) Pub Date : 2020-08-17 Scott Melnyk; Stephen Packer; John-Paul Zonneveld; Murray K. Gingras
A new wood-boring ichnospecies is described from transgressive (lagoonal) deposits of the Lower Cretaceous Sparky Formation (Mannville Group) in west-central Saskatchewan, Canada. Apectoichnus lignummasticans new ichnospecies is a trace fossil that occurs in a thin coal bed and that was emplaced in an in situ xylic substratum (woodground). The ichnofossil is thin, elongate, unbranched, and straight
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Arceoaster hintei n. gen. n. sp., a late Silurian homeomorphic asteroid (Echinodermata, Hudsonasteridae) J. Paleontol (IF 1.653) Pub Date : 2020-08-03 Daniel B. Blake; James Sprinkle
The late Silurian Arceoaster hintei new genus new species (Asteroidea, Echinodermata) is based on a single complete specimen from the lower Hunton Group of southern Oklahoma. Overall ossicular arrangement enables assignment of the new genus to the Paleozoic stem-family Hudsonasteridae; however, Arceoaster n. gen. is homeomorphic with members of the post-Paleozoic crown-group Goniasteridae. Because
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First record of a shore bug (Insecta, Hemiptera, Saldidae) from Gondwana J. Paleontol (IF 1.653) Pub Date : 2020-07-28 Dionizio A. Moura-Júnior; Sandro M. Scheffler; Felipe F. F. Moreira; André Nel; Gabriel Mejdalani
A new Saldidae (MCT 6959-I) from the Crato Formation (Lower Cretaceous, late Aptian), Santana Group, Araripe Basin (northeastern Brazil) is described and illustrated. Olindasalda gondwanica n. gen. n. sp. is the first fossil Saldidae recorded from the Gondwanan supercontinent. The new genus can be distinguished from other members of the subfamily Chiloxanthinae by its small (4.49 mm) and oval-elongated
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The Ediacaran frondose fossil Arborea from the Shibantan limestone of South China J. Paleontol (IF 1.653) Pub Date : 2020-07-20 Xiaopeng Wang; Ke Pang; Zhe Chen; Bin Wan; Shuhai Xiao; Chuanming Zhou; Xunlai Yuan
Bituminous limestone of the Ediacaran Shibantan Member of the Dengying Formation (551–539 Ma) in the Yangtze Gorges area contains a rare carbonate-hosted Ediacara-type macrofossil assemblage. This assemblage is dominated by the tubular fossil Wutubus Chen et al., 2014 and discoidal fossils, e.g., Hiemalora Fedonkin, 1982 and Aspidella Billings, 1872, but frondose organisms such as Charnia Ford, 1958
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A comprehensive anatomical and phylogenetic evaluation of Dilophosaurus wetherilli (Dinosauria, Theropoda) with descriptions of new specimens from the Kayenta Formation of northern Arizona J. Paleontol (IF 1.653) Pub Date : 2020-07-07 Adam D. Marsh; Timothy B. Rowe
Dilophosaurus wetherilli was the largest animal known to have lived on land in North America during the Early Jurassic. Despite its charismatic presence in pop culture and dinosaurian phylogenetic analyses, major aspects of the skeletal anatomy, taxonomy, ontogeny, and evolutionary relationships of this dinosaur remain unknown. Skeletons of this species were collected from the middle and lower part
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Taxonomy and functional morphology of the Urasterellidae (Paleozoic Asteroidea, Echinodermata) J. Paleontol (IF 1.653) Pub Date : 2020-07-07 Daniel B. Blake; Joseph Koniecki
Family-level taxonomic concepts for Paleozoic Asteroidea are problematic; data availability for the family Urasterellidae, however, is judged sufficient for familial reappraisal. The survey cannot be fully comprehensive because certain available names are founded on very limited material, with specimens widely scattered among collections. Recognized urasterellid genera include Urasterella Schuchert
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Marsupials (Mammalia, Metatheria) from the Brule Formation (Whitneyan, Oligocene) North Dakota J. Paleontol (IF 1.653) Pub Date : 2020-07-03 William W. Korth; Clint A. Boyd; Robert J. Emry; Jeff J. Person
Five marsupial species are recognized from the Brule Formation at two localities in southwestern North Dakota: Fitterer Ranch and Obritsch Ranch (middle Oligocene; Whitneyan North American Land Mammal Age [NALMA]). The herpetotheriids Herpetotherium fugax Cope, 1873a, Copedelphys superstes new species, and the peradectid Nanodelphys hunti (Cope, 1873b) are represented at both localities. A fourth species
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Using three-dimensional geometric morphometric and dental topographic analyses to infer the systematics and paleoecology of fossil treeshrews (Mammalia, Scandentia) J. Paleontol (IF 1.653) Pub Date : 2020-07-03 Keegan R. Selig; Eric J. Sargis; Stephen G.B. Chester; Mary T. Silcox
Treeshrews are small, Indomalayan mammals closely related to primates. Previously, three-dimensional geometric morphometric analyses were used to assess patterns of treeshrew lower second molar morphology, which showed that the positions of molar landmarks covary with intraordinal systematics. Another analysis used dental topographic metrics to test patterns of functional dental morphology and found
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Microconchus cravenensis n. sp.: a giant among microconchid tubeworms J. Paleontol (IF 1.653) Pub Date : 2020-07-02 Michał Zatoń; David J.C. Mundy
A new species of microconchid tubeworm, Microconchus cravenensis is described from the Mississippian Cracoean reefs of North Yorkshire, United Kingdom. Despite the fact that some other microconchid species could have attained large tube length, the new species possesses the largest recorded diameter (to 7.7 mm) of the planispirally-coiled (attachment) tube and the largest recorded aperture diameter
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Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia J. Paleontol (IF 1.653) Pub Date : 2020-04-17 Jisuo Jin; Robert B. Blodgett
A Late Ordovician brachiopod fauna from the Black River quadrangle (D-1 1:63,360 scale) of east-central Alaska comprises taxa typical of the Late Ordovician brachiopod fauna in the pericratonic epeiric seas of Laurentia, including Hesperorthis pyramidalis (Twenhofel, 1928), Plaesiomys occidentalis (Okulitch, 1943), Eoplectodonta sp., Holtehdalina sp., Leptaena sp., Brevilamnulella minuta n. sp., Tcherskidium
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New fossil stilt-legged mites of Neophyllobius Berlese, 1886 (Acariformes, Camerobiidae) from Eocene Baltic amber J. Paleontol (IF 1.653) Pub Date : 2020-04-20 Mateusz Zmudzinski
The fossil record of the family Camerobiidae has been represented by only one species, Neophyllobius succineus Bolland and Magowski, 1990, described from Eocene Baltic amber. These prostigmatan mites are distinguishable by their distinctly long and slender stilt-like legs, and they are associated with aboveground vegetation where they hunt for other small invertebrates. This paper enhances the knowledge
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First articulated stalked crinoids from the Mesozoic of South America: two new species from the Lower Cretaceous of the Neuquén Basin, west-central Argentina J. Paleontol (IF 1.653) Pub Date : 2020-04-23 Darío G. Lazo; Graciela S. Bressan; Ernesto Schwarz; Gonzalo D. Veiga
Two new isocrinids are described from the Lower Cretaceous Agrio Formation of the Neuquén Basin, west-central Argentina. Isocrinus (Chladocrinus) covuncoensis new species is based on several beautifully preserved specimens from Valanginian beds of the Pilmatué Member. It is characterized by a small size, multiramose crown with six arm divisions, 240 arm tips, mostly isotomous branching, seven (or rarely
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The last pteraspids (Vertebrata, Heterostraci): new material from the Middle Devonian of Alberta and Idaho J. Paleontol (IF 1.653) Pub Date : 2020-04-17 David K. Elliott; Linda S. Lassiter; Kathryn E. Geyer
This report documents the last pteraspids, (armored, jawless members of the Heterostraci), which are otherwise only known from the Early Devonian of the Old Red Sandstone Continent. Tuberculate pteraspid heterostracans are described from the Middle Devonian beds of two formations in western North America. The late Givetian Yahatinda Formation of Alberta and British Columbia consists of channels cut
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The Eocene ischyromyid rodent Thisbemys from the Washakie Formation, Wyoming (early Eocene, late Bridgerian) with comments on the systematics of the genus J. Paleontol (IF 1.653) Pub Date : 2020-06-18 William W. Korth
A large sample (>100 specimens) of the fossil rodent Thisbemys Wood, 1959, from the early Eocene (late Bridgerian; Br3) Washakie Formation of Wyoming is described. Two species are recognized: a new species, T. intermedius n. sp., and Thisbemys cf. T. uintensis (Osborn, 1895). The large sample size of the former has allowed for a detailed study of variation in size and morphology within the species
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