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Recumbirostran ‘microsaurs’ are not amniotes J. Syst. Palaeontol. (IF 2.6) Pub Date : 2024-02-07 Robert R. Reisz, Tea Maho, Sean P. Modesto
Amniota is a tetrapod clade that includes extant mammals and reptiles, including birds, as well as a wealth of extinct taxa extending over 318 million years of Earth’s history. For over three decad...
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Objective identification of Lepidocyclina (Foraminifera) species from the Eocene of Cuba based on growth-invariant morphometric characters J. Syst. Palaeontol. (IF 2.6) Pub Date : 2024-02-02 Ana I. Torres-Silva, Johann Hohenegger
Megalospheric specimens of Lepidocyclina from seven localities in western and central Cuba were morphometrically investigated using 11 growth-independent characters for equatorial sections of nepio...
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A new titanosaurian sauropod, Gandititan cavocaudatus gen. et sp. nov., from the Late Cretaceous of southern China J. Syst. Palaeontol. (IF 2.6) Pub Date : 2024-01-17 Fenglu Han, Ling Yang, Fasheng Lou, Corwin Sullivan, Xing Xu, Wenjiang Qiu, Hanfeng Liu, Juan Yu, Rui Wu, Yuzheng Ke, Mengyuan Xu, Jinfeng Hu, Pikun Lu
Large quadrupedal sauropod dinosaurs of the group Titanosauria were globally distributed in the Late Cretaceous. Many titanosaurian species have been discovered in eastern Asia, but most of them ar...
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A new derived mosasaurine (Squamata: Mosasaurinae) from south-western Japan reveals unexpected postcranial diversity among hydropedal mosasaurs J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-12-11 Takuya Konishi, Masaaki Ohara, Akihiro Misaki, Hiroshige Matsuoka, Hallie P. Street, Michael W. Caldwell
Reported herein is a largely complete mosasaurine mosasaur (Squamata: Mosasauridae) skeleton from Wakayama Prefecture, south-western Japan. It is represented by many skeletal elements including the...
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Species of Inversiulidae Vigneaux, 1949 (Bryozoa: Cheilostomatida) in the early Miocene of Patagonia (Argentina), with a phylogenetic and palaeobiogeographical analysis of the family J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-12-11 Juan López-Gappa, Martín D. Ezcurra, Silviu O. Martha, Leandro M. Pérez
The family Inversiulidae, and its only genus Inversiula, are unique among cheilostome bryozoans owing to the reverse orientation of the operculum, which hinges distally instead of proximally. Inver...
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A new polyglyphanodontian lizard with a complete lower temporal bar from the Upper Cretaceous of southern China J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-12-04 Lida Xing, Kecheng Niu, Susan E. Evans
Polyglyphanodontians were a dominant terrestrial lizard group during the Cretaceous. They were mainly distributed across Laurasia but show their greatest diversity in the Upper Cretaceous deposits ...
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A new pipid from the Cretaceous of Africa (In Becetèn, Niger) and early evolution of the Pipidae J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-11-27 Alfred Lemierre, Salvador Bailon, Annelise Folie, Michel Laurin
Pipimorpha and its crown-group Pipidae possess one of the most extensive fossil records among anurans, known since the Early Cretaceous in both Laurasia and Gondwana. Pipimorph diversification may ...
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New odonatans (Odonata: Gomphaeschnidae; Synlestidae) from the Paleocene Paskapoo Formation: systematic and biogeographical implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-11-20 Corentin Jouault, Baptiste Coutret, Kurt O. Konhauser, André Nel
The Paleocene Paskapoo Formation in Alberta, Canada, offers a unique opportunity to gain insight into insect diversity at that time. This fossil insect-rich formation has yielded a variety of fossi...
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Gujaratia indica, the oldest artiodactyl (Mammalia) from South Asia: new dental material and phylogenetic relationships J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-11-03 Abhay Rautela, Sunil Bajpai
Diacodexeids are widely considered to be a paraphyletic group consisting of the oldest and most primitive artiodactyls that made their sudden appearance in all northern continents around the Palaeo...
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The origins of major sessile cirripede groups; a revision of Cretaceous Brachylepadomorpha and Verrucomorpha J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-10-27 Andy S. Gale, Steven U. Vidovic
The taxonomy of Cretaceous cirripedes referred to the sessile orders Brachylepadomorpha and Verrucomorpha is revised. New taxa include the brachylepadid genera Crithmumlepas (type species C. hoensi...
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The oldest fossil record of Bauhinia s.s. (Fabaceae) from the Tibetan Plateau sheds light on its evolutionary and biogeographic implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-10-17 Yi Gao, Ai Song, Wei-Yu-Dong Deng, Lin-Lin Chen, Jia Liu, Wei-Cheng Li, Gaurav Srivastava, Robert A. Spicer, Zhe-Kun Zhou, Tao Su
Bauhinia s.s. is a large genus in the family Fabaceae, but its evolutionary and biogeographical history is still unclear due to the scarcity of fossil records compared to the highly diverse modern ...
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The Tapirus from Camp dels Ninots (NE Iberia): implications for morphology, morphometry and phylogeny of Neogene Tapiridae J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-10-17 Luca Pandolfi, Leonardo Sorbelli, Oriol Oms, Pablo Rodriguez-Salgado, Gerard Campeny, Bruno Gómez de Soler, Federica Grandi, Jordi Agustí, Joan Madurell-Malapeira
Western Eurasian Neogene tapirids are an intriguing but poorly known and poorly documented group of mammals. As the Western Eurasian Tapiridae are mainly represented by scanty and fragmented remain...
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A new tanystropheid (Diapsida: Archosauromorpha) from the Middle Triassic of SW China and the biogeographical origin of Tanystropheidae J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-10-02 Yu-Ting Lu, Jun Liu
Tanystropheidae is a clade of early archosauromorphs with high morphological disparity and a wide geographical distribution. The origin and early radiation of Tanystropheidae are still incompletely...
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Mesozoic stem-group zoroasterid sea stars imply a delayed radiation of the crown group and adaptation to the deep seas J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-09-18 Marine Fau, Loïc Villier
The family Zoroasteridae is a clade of extant sea stars found exclusively in deep marine environments (i.e. bathyal environments deeper than 200 m). In the fossil record, seven species have been co...
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A new species of Plohophorus Ameghino (Cingulata, Glyptodontidae) from the latest Pliocene–earliest Pleistocene of the Pampean Region (Argentina): the last survivor of a Neogene lineage J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-09-18 Sofía Inés Quiñones, Francisco Cuadrelli, Martin de los Reyes, Carlos Alberto Luna, Daniel Gustavo Poiré, Alfredo Eduardo Zurita
Within xenarthrans, two large groups are recognized, Pilosa (anteaters and sloths) and Cingulata (armoured xenarthrans). The latter contains Glyptodontidae, one of the most bizarre and enigmatic gr...
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Stromatoporoids of the Katian (Upper Ordovician) Beiguoshan Formation, North China J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-09-04 Juwan Jeon, Stephen Kershaw, Kun Liang, Yuandong Zhang
North China was a key centre of Middle Ordovician stromatoporoid diversification. However, detailed studies of the subsequent Late Ordovician stromatoporoid development in this terrane are lacking; thus, the spatiotemporal development of North Chinese stromatoporoids is poorly understood. The Beiguoshan Formation (middle Katian age, Late Ordovician) contains the youngest Ordovician stromatoporoids
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Occurrence of Styxosaurus (Sauropterygia: Plesiosauria) in the Cenomanian: implications for relationships of elasmosaurids of the Western Interior Seaway J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-08-23 Elliott Armour Smith, F. Robin O’Keefe
The systematics of the elasmosaurid plesiosaurs from the Late Cretaceous of the Western Interior Seaway have been contentious, with studies supporting an endemic Elasmosaurinae clade. In this study...
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A new elasmothere genus and species from the middle Miocene of Tongxin, Ningxia, China, and its phylogenetic relationship J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-08-18 Danhui Sun, Tao Deng, Xiaokang Lu, Shiqi Wang
The elasmotheres were well diversified and widespread throughout the Neogene in Eurasia and East Africa. Here we report a new elasmothere genus and species, Tongxinotherium latirhinum gen. et sp. nov., from the Zhang’enbao Formation (middle Miocene) of Tongxin, Ningxia, China. The new genus is characterized by a broad and thick nasal bone, the ‘U’-shaped nasal notch located at the level of P3, the
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A new tiny eutherian from the Late Cretaceous of Alaska J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-08-05 Jaelyn J. Eberle, William A. Clemens, Gregory M. Erickson, Patrick S. Druckenmiller
A new eutherian, Sikuomys mikros gen. et. sp. nov., is described from Upper Cretaceous (upper Campanian) strata of the Prince Creek Formation cropping out along the lower Colville River in northern Alaska, USA. The taxon represents the northernmost occurrence of a Mesozoic eutherian (palaeolatitude 80–85°N). The Alaskan taxon differs morphologically from Gypsonictops in having: weak pre- and postcingula
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An Eocene fossil plutoniumid centipede: a new species of Theatops from Baltic Amber (Chilopoda: Scolopendromorpha) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-07-19 Gregory D. Edgecombe, Susan E. Strange, George Popovici, Taylor West, Varpu Vahtera
Four specimens of the same species of scolopendromorph centipede from Eocene Baltic amber provide the first fossil occurrence of the family Plutoniumidae, a clade represented by seven extant species. The fossil material, documented by light microscopy and computed microtomography, is assigned to the genus Theatops Newport, 1844 Newport, G. (1844). [Conclusion of the monograph on the Myriapoda Chilopoda]
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A new Mesozoic teleost of the subfamily Albulinae (Albuliformes: Albulidae) highlights the proto-Gulf of Mexico in the early diversification of extant bonefishes J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-07-11 Marleni L-Recinos, Kleyton M. Cantalice, Carmen Caballero-Viñas, Jesús Alvarado-Ortega
We present a new fossil species of the order Albuliformes, †Macabi tojolabalensis gen. et sp. nov., from Campanian outcrops of Chiapas state, south-eastern Mexico. The number of branchiostegal rays, a fusion of the lower hypural elements in the caudal-fin skeleton, and the two types of cycloid scales over the body are features that separate this new taxon from other members of the order. Its inclusion
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The early Cambrian Emu Bay Shale radiodonts revisited: morphology and systematics J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-07-10 John R. Paterson, Diego C. García-Bellido, Gregory D. Edgecombe
Two species of Radiodonta (stem-group Euarthropoda) from the Emu Bay Shale (Cambrian Series 2, Stage 4), Kangaroo Island, South Australia, are revised based on new field collections and insights from recent phylogenetic analyses and advances in knowledge of radiodonts globally. Anomalocaris briggsi Nedin, 1995 Nedin, C. (1995). The Emu Bay Shale, a Lower Cambrian fossil Lagerstätten, Kangaroo Island
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A new cryptodire from the Eocene of the Na Duong Basin (northern Vietnam) sheds new light on Pan-Trionychidae from Southeast Asia J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-06-22 Tobias Massonne, Felix J. Augustin, Andreas T. Matzke, Madelaine Böhme
Striatochelys baba gen. et sp. nov. is a new pan-trionychid from the middle–upper Eocene (late Bartonian–Priabonian, 39–35 Ma) of the Na Duong Basin in northern Vietnam. It represents one of the best documented and most completely known Palaeogene pan-trionychid species from Asia. Striatochelys baba can be diagnosed by: (1) its relatively small size; (2) the absence of a preneural; (3) the presence
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Tentacular nature of the ‘column’ of the Cambrian diploblastic Xianguangia sinica J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-06-19 Yang Zhao, Xian-guang Hou, Pei-yun Cong
Unveiling the body architectures of Cambrian problematic fossils would provide novel insights into the radiation of metazoan body plans during the ‘Cambrian Explosion’ and the ancestral traits of major living animal clades. Xianguangia sinica, from the celebrated Chengjiang biota (∼518 Ma), is a typical Cambrian problematicum with disputable body architecture, particularly about its ‘column’ part.
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Vectipelta barretti, a new ankylosaurian dinosaur from the Lower Cretaceous Wessex Formation of the Isle of Wight, UK J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-06-15 Stuart Pond, Sarah-Jane Strachan, Thomas J. Raven, Martin I. Simpson, Kirsty Morgan, Susannah C. R. Maidment
The Wealden Group of southern England was deposited by rivers, on floodplains and in lagoons during the Early Cretaceous. Two historically significant ankylosaurs, Polacanthus and Hylaeosaurus, are currently known from its deposits; Hylaeosaurus from the ‘lower Wealden fauna’ and Polacanthus from the ‘upper Wealden fauna’. Here, we describe a new genus and species of ankylosaur from the Wessex Formation
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A new ‘archaeohyracid’ (Notoungulata, Typotheria) from the Eocene of north-western Argentina: anatomy, phylogenetic relationships and evolutionary implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-06-15 Agostina Ferro, Daniel A. García-López, Luis S. Saade, Pablo J. Alonso-Muruaga, Agustín Scanferla
Here we describe a new notoungulate taxon, Pascualhyrax irqi sp. nov., from Eocene levels of north-western Argentina. The materials studied include cranial and dental remains and were exhumed in sediments of the Quebrada de los Colorados Formation, corresponding to the late middle Eocene (Bartonian). General traits of the referred specimens (e.g. hypsodont postcanines, nasal bulge) point to a close
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The phylogenetic relationships and evolutionary history of the armoured dinosaurs (Ornithischia: Thyreophora) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-05-18 Thomas J. Raven, Paul M. Barrett, Chris B. Joyce, Susannah C. R. Maidment
The armoured dinosaurs (Thyreophora) were a significant component of Mesozoic terrestrial ecosystems, appearing in the earliest Jurassic and surviving until the latest Cretaceous, and fossils of the group have been found on all continents, including Antarctica. However, a patchy fossil record and highly modified anatomy has hindered reconstruction of their evolutionary history. For example, the relationships
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New material of Miotragocerus (Bovidae, Artiodactyla) from northern China and its systematic implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-04-26 Qin-Qin Shi, Zhao-Qun Zhang
Late Miocene tragoportacins are widespread in Eurasia and Africa and are important members of the Hipparion fauna. The phylogenetic relationships within the tragoportacins are debatable due to the large number of species, fragmentary materials, and large intraspecific variations. The Chinese tragoportacins are rare and poorly studied in previous work. Recently, a dozen well-preserved skulls were excavated
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X-ray microtomography of the late Carboniferous whip scorpions (Arachnida, Thelyphonida) Geralinura britannica and Proschizomus petrunkevitchi J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-04-04 Russell J. Garwood, Jason A. Dunlop
Whip scorpions (Thelyphonida) and schizomids (Schizomida) are closely related arachnid orders, whose low species diversity compared to other arachnid groups is reflected in a limited fossil record. Here we investigate two key fossil whip scorpions from the British Middle Coal Measures of Coseley, Staffordshire (late Carboniferous, c. 315 Ma), UK, using X-ray microtomography, and incorporate the taxa
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Silurian phyllocarid crustaceans (Phyllocarida, Archaeostraca) from South China J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-04-04 Yilong Liu, Markus J. Poschmann, Ruoying Fan, Ruiwen Zong, Yiming Gong
In the Silurian, the suborder Caryocaridina of the phyllocarids was replaced by the suborder Ceratiocaridina as the dominant group. The latter did not achieve a global distribution until the late Silurian. In the early Silurian, ceratiocarids were a little-diversified group and palaeogeographically restricted mainly to Laurussia. Although previous studies have mentioned phyllocarid fossils from the
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A new entelodont (Artiodactyla, Mammalia) from the late Eocene of China and its phylogenetic implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-03-31 Yang Yu, Hongyan Gao, Qiang Li, Xijun Ni
We report a new genus and species of Entelodontidae, Entelodontellus zhouliangi gen. et sp. nov. The new taxon is represented by a pair of mandibular halves which belong to the same individual. The left mandible preserves three molars and the right half preserves p4–m3. It can be distinguished from other entelodonts by presenting a large robust posterior mandibular tubercle, and a primitive dental
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First fossil evidence for a new frog from the Early Cretaceous of the Jiuquan Basin, Gansu Province, north-western China J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-03-20 Jing Zhang, Liping Dong, Baoxia Du, Aijing Li, Xiangtong Lei, Mingzhen Zhang, Sen Wang, Guorong Ma, Jianguo Hui
Based on a well-preserved incomplete skeleton, a new frog, Gansubatrachus qilianensis gen. et sp. nov., is described from the Lower Cretaceous Zhonggou Formation of Jiuquan Basin, Gansu Province, n...
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Re-assessment of the Late Jurassic eusauropod Mamenchisaurus sinocanadorum Russell and Zheng, 1993, and the evolution of exceptionally long necks in mamenchisaurids J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-03-15 Andrew J. Moore, Paul M. Barrett, Paul Upchurch, Chun-Chi Liao, Yong Ye, Baoqiao Hao, Xing Xu
The sauropod genus Mamenchisaurus, from the Late Jurassic–Early Cretaceous of East Asia, has a convoluted taxonomic history. Although included in the first cladistic analysis of sauropods, only recently has the monophyly of Mamenchisaurus, and the anatomical diversity of the many penecontemporaneous East Asian eusauropods, been evaluated critically. Here, we re-describe the holotype and only specimen
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Double-armoured herrings (Clupeomorpha: Ellimmichthyiformes) from the Lower Cretaceous of Pietraroja (Southern Italy) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-03-09 Giuseppe Marramà, Giorgio Carnevale
The Lower Cretaceous (Albian) clupeomorph fishes of the Pietraroja Plattenkalk were among the first fishes described for this celebrated Italian Konservat-Lagerstätte. However, a detailed anatomical and phylogenetic study has never been carried out on these fishes in order to clarify their taxonomic status, systematic position, and relationships within the Clupeomorpha. The specimens examined herein
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An earliest Paleocene squirrelfish (Teleostei: Beryciformes: Holocentroidea) and its bearing on the timescale of holocentroid evolution J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-03-03 James V. Andrews, Jason P. Schein, Matt Friedman
The record of articulated marine fish fossils during the latest Cretaceous and earliest Cenozoic is sparse. The oldest-known definitive squirrelfishes and soldierfishes, like the first examples of many extant reef-dwelling clades, are known from early Eocene deposits of Europe. Here, we describe a new genus and species of holocentroid (Teleostei: Beryciformes: Holocentroidea) based on material from
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Fossils from the Montceau-les-Mines Lagerstätte (305 Ma) shed light on the anatomy, ecology and phylogeny of Carboniferous millipedes J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-02-16 Mickaël Lheritier, Maëva Perroux, Jean Vannier, Gilles Escarguel, Thomas Wesener, Leif Moritz, Dominique Chabard, Jérome Adrien, Vincent Perrier
Arthropods constitute a highly diverse group of animals dominated by insects, arachnids, crustaceans and myriapods, the latter consisting of two important classes: Chilopoda and Diplopoda. Diplopods are remarkable for their diversity and disparity and have a long and rich fossil record going back to the Silurian. Here, X-ray microtomography (µCT) reveals the detailed morphology of two diplopods from
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A new Caloneurodea family (Insecta, Archaeorthoptera) increases the insect palaeodiversity of the middle Permian Salagou Formation (southern France) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2023-01-31 André Nel, Jean-Paul Kundura, Jean-Marc Pouillon, Romain Garrouste, Corentin Jouault
A new genus and species of the archaeorthopteran order Caloneurodea are described and illustrated from the Salagou Formation (France) as Lodevogramma pumilia gen. et sp. nov. The particular wing venation of this species precludes its placement within one of the already described families of Caloneurodea. Consequently, the family Lodevogrammatidae fam. nov. is created to accommodate this specimen. A
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Phylogeny of the Ordovician and Silurian members of the order Atrypida J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-12-19 B. Gudveig Baarli, Bing Huang, Luana S. Maroja
Brachiopods belonging to order Atrypida originated in the Middle Ordovician and went extinct in the Late Devonian. Few cladistic studies have been undertaken for this group. Here we investigate their early evolution through Silurian time. We present a parsimony-based phylogenetic analysis of 41 characters and 70 genera representing all the early taxonomic groups within the order. The stratigraphical
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A new small-bodied ankylosaurian dinosaur from the Upper Cretaceous of North Patagonia (Río Negro Province, Argentina) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-12-01 Facundo Riguetti, Xabier Pereda-Suberbiola, Denis Ponce, Leonardo Salgado, Sebastián Apesteguía, Sebastián Rozadilla, Victoria Arbour
The most representative ankylosaurian remains from Argentina have been found in sediments of the Allen Formation (Campanian–Maastrichtian) in Salitral Moreno, Río Negro Province. Several authors have discussed the identity and history of these remains. In this study, we review all published material along with some new remains in order to summarize all the knowledge about these ankylosaurs. Previously
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Osteology of Dashanpusaurus dongi (Sauropoda: Macronaria) and new evolutionary evidence from Middle Jurassic Chinese sauropods J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-11-18 Xin-Xin Ren, Shan Jiang, Xu-Ri Wang, Guang-Zhao Peng, Yong Ye, Logan King, Hai-Lu You
The Middle Jurassic lower Shaximiao Formation in Sichuan Province of south-western China has yielded a diverse terrestrial vertebrate fauna dominated by sauropod dinosaurs. However, many of these sauropods lack detailed descriptions or explicit phylogenetic diagnoses. Here, we present a comprehensive redescription of Dashanpusaurus dongi, a species of sauropod found only in the lower Shaximiao Formation
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Silicified cupulate seed-bearing structures from the Early Cretaceous of eastern Inner Mongolia, China: rethinking the corystosperm concept J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-11-15 Gongle Shi, Fabiany Herrera, Patrick S. Herendeen, Elizabeth G. Clark, Peter R. Crane
The group referred to informally as the corystosperms, described initially based on compression fossils from the Triassic of Gondwana, have long been considered critical extinct plants for understanding seed plant phylogeny, the evolution of seed plant reproductive structures and the relationships of angiosperms. Here we describe a new genus and species of corystosperm seed-bearing structure, Jarudia
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A new proterochampsid (Archosauriformes: Proterochampsia) from the Late Triassic of southern Brazil and the emergence of archosaurian hind limb traits J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-11-03 Rodrigo Temp Müller, Mauricio Silva Garcia, André de Oliveira Fonseca
Characterized by an elongated snout, proterochampsids are carnivorous non-archosaur archosauriforms. The clade is endemic to South America and its fossil record extends from the early Carnian to the late Carnian/early Norian. Nesting close to Archosauria, it is a key clade for understanding the origin and evolution of archosaurian traits. Unfortunately, hind limb elements are usually poorly preserved
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Description of Acheronauta gen. nov., a possible mandibulate from the Silurian Waukesha Lagerstätte, Wisconsin, USA J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-10-10 Mikaela A. Pulsipher, Evan P. Anderson, Lauren S. Wright, Joanne Kluessendorf, Donald G. Mikulic, James D. Schiffbauer
The Silurian Waukesha Lagerstätte of Wisconsin, USA, hosts a fauna of distinctive soft-bodied organisms, including a range of graptolites, worms, trilobites and uncommon arthropods, but otherwise lacks most of the shelly fauna typical of contemporaneous deposits. While several species have been described, much of the Waukesha biota remains understudied. Here, we examine numerous specimens of a previously
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Careful amendment of morphological data sets improves phylogenetic frameworks: re-evaluating placement of the fossil Amiskwia sagittiformis J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-10-05 Nicolas Bekkouche, Ludwik Gąsiorowski
The Cambrian fossil Amiskwia sagittiformis has puzzled palaeontologists for more than a century, but recent re-investigation of its morphology suggested a close relationship with the bilaterian clade Gnathifera, comprising Rotifera, Gnathostomulida and Micrognathozoa. Since Amiskwia has already been considered closely related to Chaetognatha, this new interpretation of its morphology supports recent
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Phylogeny of the amphibamiform temnospondyls: the relationship of taxa known by adults, larvae and neotenes J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-10-05 Rainer R. Schoch
The Amphibamiformes, small temnospondyls from late Palaeozoic rocks, have been increasingly considered as the stem-group of some or all extant amphibians (Lissamphibia). Their relationships have become intensely studied after the discovery of new taxa and the revision of poorly known ones, but understanding is hampered by the fact that amphibamiforms fall into two very distinct groups: (a) terrestrial
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Re-description and phylogenetic relationships of †Protosyngnathus sumatrensis (Teleostei: Syngnathoidei), a freshwater pipefish from the Eocene of Sumatra, Indonesia J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-09-30 Alison M. Murray
†Protosyngnathus sumatrensis is known from six specimens from Eocene lacustrine deposits of the Sangkarawang Formation of Sumatra, Indonesia. The fish was named almost 150 years ago, but has never been well described or figured. Probably because of this, it has not been included in phylogenies of extant pipefishes and seahorses (Syngnathiformes). A detailed description is provided, along with a new
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Appendicular osteology of Skorpiovenator bustingorryi (Theropoda, Abelisauridae) with comments on phylogenetic features of abelisaurids J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-09-22 Mauricio A. Cerroni, Mattia A. Baiano, Juan I. Canale, Federico L. Agnolín, Alejandro Otero, Fernando E. Novas
Skorpiovenator bustingorryi is a derived abelisaurid theropod represented by a fairly complete skeleton from the Late Cretaceous sedimentary beds of north-western Patagonia. Although some features were described in the original paper, mainly related to the skull, the appendicular anatomy remains undescribed. The aim of the present contribution is to provide a detailed description and analysis of the
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The first evidence of Heosminthus from North America and the phylogenetics of Sminthidae (Mammalia, Rodentia, Dipodoidea): biogeographical implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-09-22 J. J. M. Calede, Y. T. Tse, K. D. Cairns
The Eurasian fossil record is rich with the remains of sminthid rodents, a clade today represented by a single genus, Sicista. In contrast, the North American record of the family is sparse and exclusively composed of species of Plesiosminthus, an animal bearing a grooved incisor, during the Oligocene. This fossil record is the product of dispersal events from Eurasia. We here present the first occurrence
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A nearly complete skeleton of a new eusphenodontian from the Upper Jurassic Morrison Formation, Wyoming, USA, provides insight into the evolution and diversity of Rhynchocephalia (Reptilia: Lepidosauria) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-09-15 David G. DeMar Jr., Marc E. H. Jones, Matthew T. Carrano
We describe a new, small-bodied rhynchocephalian reptile, Opisthiamimus gregori gen. et sp. nov., from the Upper Jurassic Morrison Formation of Wyoming, USA. Whereas many fossil rhynchocephalians are based on isolated incomplete jaws, the holotype of O. gregori includes most of the skull and postcranium and therefore represents one of the most complete specimens of Rhynchocephalia known from North
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Xinjiangchelyid turtles from the Middle Jurassic of the Berezovsk coal mine (Krasnoyarsk Territory, Russia): systematics, skeletal morphology, variation, relationships and palaeobiogeographic implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-09-07 Ekaterina M. Obraztsova, Sergei A. Krasnolutskii, Vladimir B. Sukhanov, Igor G. Danilov
This paper is devoted to the description of a new species of xinjiangchelyid turtle – Annemys variabilis sp. nov. – represented by thousands of isolated bones and several more complete specimens from the Middle Jurassic (Bathonian) Itat Formation of the Berezovsk coal mine, Krasnoyarsk Territory, western Siberia, Russia. The description is based on a sample of the best-preserved specimens. The new
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A new aetiocetid (Cetacea, Mysticeti, Aetiocetidae) from the late Oligocene of Mexico J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-30 Atzcalli Ehécatl Hernández-Cisneros
The aetiocetids are a well-known extinct taxon of Oligocene toothed mysticetes in the North Pacific. They display a high degree of diversity contrasting with that of other tooth-bearing mysticetes such as mammalodontids, llanocetids and Coronodon spp. The disparate developmental patterns (heterochrony) and origin of the first kelp forests in the North Pacific during the Eocene–Oligocene transition
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Unravelling the identity of the platanistoid Notocetus vanbenedeni Moreno, 1892 (Cetacea, Odontoceti) from the early Miocene of Patagonia (Argentina) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-24 Mariana Viglino, Mónica Romina Buono, Yoshihiro Tanaka, José Ignacio Cuitiño, Robert Ewan Fordyce
Platanistoidea remains one of the most evolutionarily intriguing lineages of toothed whales (Odontoceti). The clade comprises mostly extinct species from the late Oligocene–early Miocene onward and a single extant riverine genus (Platanista). There is an ongoing debate as to the membership of Platanistoidea and the causes of their near extinction. In Patagonia (Argentina), the most abundant platanistoid
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Phylogenetic analysis of the gastropod genus Calliotropis Seguenza, 1902 (Vetigastropoda: Calliotropidae), including fossil and living species J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-24 Damián Eduardo Pérez, Mariel Ferrari, Martín Daniel Ezcurra
The taxonomic content of the genus Calliotropis and the systematic positions of the fossil species referred to this genus have been under debate because of the striking resemblance they bear to their extant counterparts in terms of general shell morphology and ornament pattern. In a recent contribution, two subgenera of Calliotropis were preliminarily distinguished and considered to be a result of
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Towards a unifying systematic scheme of fossil and living billfishes (Teleostei, Istiophoridae) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-19 Carlos De Gracia, Alex Correa-Metrio, Mónica Carvalho, Jorge Velez-Juarbe, Tomáš Přikryl, Carlos Jaramillo, Jürgen Kriwet
Extant istiophorids are open ocean apex predators that are extensively studied due to their ecological importance and high values for fisheries. Nevertheless, little is known about their evolution because of a fragmentary fossil record and extremely difficult taxonomy of fossil species. Here, we present a new phylogenetic hypothesis covering fossil and living istiophorids. Our results demonstrate that
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New allotherian specimens from the Middle Jurassic Woodeaton Quarry (Oxfordshire) and implications for haramiyidan diversity and phylogeny J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-19 Fangyuan Mao, Philippa Brewer, Jerry J. Hooker, Jin Meng
We report new allotherian tooth specimens from the Middle Jurassic White Limestone Formation at Woodeaton Quarry (Oxfordshire), United Kingdom. Two teeth are assigned to Kermackodon (=Eleutherodon) oxfordensis, a taxon whose original generic name (Eleutherodon) was preoccupied and is here assigned to Kermackodon to form a new binomial combination for the species name. Butlerodon quadratus gen. et sp
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New rodents shed light on the age and ecology of late Miocene ape locality of Tapar (Gujarat, India) J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-08-05 Rajeev Patnaik, Ningthoujam Premjit Singh, K. Milankumar Sharma, Nongmaithem Amardas Singh, Deepak Choudhary, Y. Priyananda Singh, Rohit Kumar, Wasim Abass Wazir, Ashok Sahni
The Miocene ape (Sivapithecus) locality of Tapar in Kutch (Gujarat, India) has yielded a diverse rodent assemblage that includes: a new murine Progonomys prasadi sp. nov., a new gerbilline Myocricetodon gujaratensis sp. nov., a new rhizomyne Kanisamys kutchensis sp. nov. and a new sciurine Tamias gilaharee sp. nov., beside additional remains of Progonomys morganae, Dakkamys asiaticus, Prokanisamys
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A new podocnemidid (Pleurodira: Pelomedusoides) from the Eocene of north-western Argentina, with comments on its evolutionary relationships and palaeoenvironmental settings J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-07-25 Marcelo S. de la Fuente, Ignacio J. Maniel, Pablo González Ruiz, Jonathan Ledesma, Maria V. Deraco, Cecilia del Papa, Claudia Herrera
We report a new small podocnemidid, Gestemys powelli gen. et sp. nov., based on one nearly complete skull, lower jaw, two shells, and remains of the appendicular skeleton belonging to two specimens from the Eocene Geste Formation of the San Antonio de la Cobres Basin, Salta Province, north-western Argentina. As in other podocnemidid genera, Gestemys exhibits a fully developed and medially extensive
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Editorial J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-07-19 Sue Greene, Paul Barrett, Zerina Johanson
Published in Journal of Systematic Palaeontology (Vol. 20, No. 1, 2022)
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The fossil record of sabre-tooth characins (Teleostei: Characiformes: Cynodontinae), their phylogenetic relationships and palaeobiogeographical implications J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-06-24 Gustavo A. Ballen, Jorge W. Moreno-Bernal, Carlos Jaramillo
The family Cynodontidae is composed of freshwater fishes inhabiting drainages east of the Andes in South America. Its fossil record is mostly represented by isolated teeth that are difficult to identify. Here we describe fossil cranial remains of the extant species Hydrolycus scomberoides as well as isolated teeth that were identified as Hydrolycus and cf. Rhaphiodon in sediments of the late Pliocene
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Redescription, taxonomy and phylogenetic relationships of Boavus Marsh, 1871 (Serpentes: Booidea) from the early–middle Eocene of the USA J. Syst. Palaeontol. (IF 2.6) Pub Date : 2022-06-07 Silvio Onary, Annie S. Hsiou, Michael S. Y. Lee, Alessandro Palci
The extinct fossil snake Boavus occurs in early–middle Eocene localities in the United States. Four species are currently recognized, but until now, no formal phylogenetic analyses have been conducted to test its relationships within snakes. Here, we provide an osteological redescription and systematic revision of the genus, accompanied by phylogenetic analyses using multiple methods. Based on new