Bathy- and mesopelagic annelida from the Arctic Ocean: Description of new, redescription of known and notes on some “cosmopolitan” species

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Highlights

  • A new species of Polynoidae and a new genus of Lopadorrhynchidae are described from the Arctic Ocean.

  • 18 S rDNA barcoding shows presence of complex species instead of “cosmopolitan” species, Pelagobia cf. longicirrata Greeff (1879) (Lopadorrhynchidae).

Abstract

Pelagic polychaetes collected in the deep Arctic Ocean between 2011 and 2016 during three expeditions of R/V Polarstern were investigated using morphological taxonomic and molecular methods based on DNA sequences for portions of the mitochondrial 16S and nuclear 18S and 28S rDNA genes. A comparison of our results on arctic Pelagobia cf. longicirrata Greeff, 1879, (Lopadorrhynchidae) and Typhloscolex cf. muelleri Busch, 1851 (Typhloscolecidae) with the data on P. cf. longicirrata and T. cf. muelleri from the Atlantic, Antarctic and Pacific, suggests the presence of species complexes within each of them instead of cosmopolitan species. We infer the validity of Phalacrophorus borealis Reibisch, 1895 (Iospilidae), synonymized earlier by several authors with cosmopolitan P. pictus Greeff, 1879 as a subspecies. Also, we describe a new Lopadorrhynchidae genus, Bathypelagobia gen. nov. with a redescription of Pedinosoma polaris (Buzhinskaja, 2017). Finally, we describe a new Polynoidae species, Bathypolaria kondrashovi sp. nov. with some notes on the reproductive biology of the latter species.

Introduction

In the XIX and first half of the XX centuries, with the beginning of an active discovery of marine zooplankton, many species of pelagic invertebrates were described from different regions of the marine realm (Wagner, 1872; Greeff, 1879; Viguer, 1886, 1911; Reibisch, 1895; Southern, 1909; Bergström, 1914; Fauvel, 1916; Augener, 1922). These initial descriptions based mainly on morphological data were often brief and lacking details, and the respective holotypes were often lost (Wagner, 1872; Greeff, 1879; Viguer, 1886, 1911; Reibisch, 1895; Southern, 1909; Bergström, 1914; Fauvel, 1916; Augener, 1922). This situation was compounded in the first third of the XX century, when the idea of wide distribution areas and high intraspecific variation of pelagic animals widely disseminated among taxonomists (Kramp, 1961; Dales, 1957; Tebble, 1962; Russell, 1970; Nygren, 2014; Hutchings and Kupriyanova, 2017). Particularly, this idea was applied to pelagic polychaetes that were considered showing unusually wide geographic distributions, and, subsequently, many of closely related species from different parts of the world were synonymized (Knox, 1959; Fauvel, 1959; Dales, 1957; Tebble, 1962; Day, 1967; Nygren, 2014; Hutchings and Kupriyanova, 2017). During the last three decades, however, the widespread adoption of molecular methods in zoology has led to another increase in the species diversity, due to rediscovering of misidentificated species, having morphological variation, that not considered of inter-specific importance.

In fact, some species may be sympatric and very similar, whereas other species may be widely-distributed and morphologically variable (Kramp, 1961; Russell, 1970; Knowlton, 1993, 2000; Nygren, 2014; Kolbasova et al., 2014; Hutchings and Kupriyanova, 2017). Molecular methods help to avoid an incorrect synonymisation of different species and a needless production of new species, but as the data on pelagic polychaetes in the genetic databases are few, there is often nothing to compare to make a decision on a species status.

During this study, we focused on investigation of pelagic polychaetes collected with plankton nets in three expeditions to deep basins of the Arctic Ocean in 2011, 2015, and 2016. Our study was aimed to better document diversity of pelagic polychaetes for this region based on critical comparison with data on their diversity that has accumulated over the years of morphological-based taxonomic and systematic studies before the widespread use of molecular approaches (Burnette et al., 2005).

Section snippets

Sampling and preservation

Specimens of polychaetes examined in this study were collected during three cruises of the R/V Polarstern to the deep Arctic Ocean: PS78 in August-September 2011 in the Nansen and Makarov Basins (stations 1 and 7), PS94 in September-October 2015 in the Nansen and Amundsen Basins (stations 2, 3, 5, and 6), and PS101 in September-October 2016 in the Amundsen Basin (station 4) (Fig. 1).

During these expeditions, zooplankton was collected with vertical casts of a plankton net (0.5 m2 mouth opening,

Lopadorrhynchidae Claparède, 1870.

Bathypelagobia gen. nov. Kolbasova, 2020.

Type species. Pedinosoma polaris (Buzhinskaja, 2017) [gender: feminine].

Diagnosis. Prostomium and peristomium fused; two antennae and two palps. Nine segments. Eyes absent, pharyngeal jaws present. Two pairs of tentacular cirri on one segment, chaetae and aciculae present on tentacular segment. Second segment without dorsal cirri. Parapodia uniramous, acicular; dorsal and ventral cirri shorter then parapodial lobes; all chaetae compound spinigers with

Discussion

Pelagic polychaetes represent a common component of zooplankton, but their diversity, taxonomy, and biology are still poorly documented (Dales, 1962; Day, 1967; Dales and Peter, 1972; Ushakov, 1972, 1974; Yingst, 1974a, b; Hartman, 1991; Støp-Bowitz, 1991, 1992; Halanych et al., 2007; Struck and Halanych, 2010). To date, about 140 species from seven holopelagic families (Alciopidae Ehlers, 1864, Lopadorrhynchidae, Iospilidae, Pontodoridae, Tomopteridae Grube, 1850, Typhloscolecidae,

Conclusions

We examined five polychaetes species from families Polynoidae, Lopadorrhynchidae, Typhloscolecidae and Iospilidae collected in the deep basins of the Arctic Ocean. Polynoidae is one of the three largest polychaetes families, and the number of polynoid species increases every year (Read and Fauchald, 2020). Here we described one more new pelagic (or semi-pelagic) polynoid species, Bathypolaria kondrashovi sp. nov. Based on results of our molecular examinations and recent data from Bonifácio and

Funding

The ship time during the PS101 expedition was funded by AWI Grant No. AWI_PS101_01. This study was performed in the framework of the state assignment of IO RAS (theme No. 0149–2019–0008), and partially supported by Russian Science Foundation grant№ 16–14–10173 and by Russian Foundation for Basic Research grants 18–05–60158, 19-04-00501 and 19-04-00955.

Ethical approval

This article does not contain any studies with animals performed by any of the authors.

Sampling and field studies

All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities.

Data availability

All data generated or analyzed during this study are included in this published article.

Declaration of competing interest

The authors declare that they have no conflict of interest.

Acknowledgements

We would like to thank Captain S. Schwarze, his crew of the RV “Polarstern” and the chief scientists Dr. Ursula Schauer and Dr. Antje Boetius for their efforts and support during PS78, PS94 and PS101 expeditions; Drs. Nicole Hildebrandt, Barbara Niehoff and Hans-Jürgen Hirche (AWI) for their contribution to organization and implementation of the zooplankton sampling during these expeditions. We acknowledge support of Scientific Committee on Oceanic Research (SCOR) and its Working Group 157

References (144)

  • E. Berkeley et al.

    On some pelagic Polychaeta from the northeast Pacific north of Latitude 40 N and east of Longitude 175 W

    Can. J. Zool.

    (1957)
  • E. Berkeley et al.

    Notes on some pelagic and some swarming Polychaeta taken off the coast of Peru

    Can. J. Zool.

    (1964)
  • M. Bilbao et al.

    First records of pelagic polychaetes in southern Chile (Boca del Guafo – Elefantes Channel)

    Lat Am J Aquat Res

    (2008)
  • P. Bonifácio et al.

    New genera and species from the Equatorial Pacific provide phylogenetic insights into deep-sea Polynoidae (Annelida)

    Zool. J. Linn. Soc.

    (2019)
  • A. Bonifazi et al.

    New records of old species: some pelagic polychaetes along the Italian coast

    Ital. J. Zool.

    (2016)
  • A.B. Burnette et al.

    Holopelagic Poeobius meseres ("Poeobiidae," Annelida) is derived from benthic flabelligerid worms

    Biol. Bull.

    (2005)
  • W. Busch

    Beobachtungen liber Anatomie und Entwicklung einiger wirbellosen Seethiere

    (1851)
  • G.N. Buzhinskaja

    Descriptions of Pedinosoma curtum Reibisch from North-West Pacific and a late larva of Pedinosoma polaris sp. nov. From the Arctic Basin

    Polychaeta: Phyllodocida: Lopadorhynchidae) Zoosyst Ross

    (2017)
  • J. Castresana

    Selection of conserved blocks from multiple alignments for their use in phylogenetic analysis

    Mol. Biol. Evol.

    (2000)
  • R. Chamberlin

    The Annelida polychaeta

    Rep. Sci. Res. Exp. “Albatross”. Mem. Mus. Comp. Zool.

    (1919)
  • É. Claparède

    Les annélides chétopodes du Golfe de Naples

    Suppl Mém Soc Phys d'Hist Nat Genève

    (1870)
  • R.P. Dales

    Pelagic polychaetes of the Pacific ocean

    Bull of the Scr Inst Ocean

    (1957)
  • R.P. Dales et al.

    A synopsis of the pelagic polychaeta

    J. Nat. Hist.

    (1972)
  • J.H. Day

    Polychaeta of Southern Africa Part 1. Errantia

    (1967)
  • H. Ditlevsen

    Polychaeta annelider. Conspectus ectus faune groenlandicae

    Meddelelser om Granland

    (1914)
  • N.V. Druzhkov et al.

    New records of the carnivorous pelagic polychaete, Phalacrophorus pictus borealis Reibisch, 1895 in the Arctic Ocean

    Sarsia

    (2000)
  • R.C. Edgar

    MUSCLE: multiple sequence alignment with high accuracy and high throughput

    Nucleic Acids Res.

    (2004)
  • E.H. Ehlers

    Die Borstenwürmer (Annelida Chaetopoda) nach systematischen und anatomischen Untersuchungen dargestellt

    (1864)
  • E. Ehlers

    Die Polychaetern-sammlungen der Deutschen sudpolar-expedition 1901–1903

    Deut Sudpolar Exp

    (1913)
  • K. Fauchald

    The Polychaete Worms. Definitions and Keys to the Orders, Families and Genera

    (1977)
  • P. Fauvel

    Aphroditiens pelagiques des Campagnes de I’Hirondelle, de la Princess-Alice et de I’Hirondelle II

    Bull. Inst. Ocean. Monaco

    (1914)
  • P. Fauvel

    Annelides polychetes des Iles Falkland recueilles par M. Rupter Vallentin Esqre (1902–1910)

    Arch. Zool. Exp. Gen.

    (1916)
  • P. Fauvel

    Polychetes Resultats du voyage de la Belgica en 1897-1899, Zoologie

    Exp Antarct Belge Anv (Buschmann)

    (1936)
  • P. Fauvel

    Classes des annélides polychètes. Distribution géographique

    Traité de Zoologie

    (1959)
  • M.A. Fernández-Álamo

    Holoplanktonic polychaetes from Gulf of California: August-september 1977

    Cal C O Fi Rep

    (1991)
  • M.A. Fernández-Álamo

    Holoplanktonic polychaetes off the southwestern coast of Baja California, México, in March, 1977

    An Inst Biol UNAM, Ser Zool

    (1996)
  • M.A. Fernández-Álamo

    Tomopterids (Annelida: polychaeta) from the eastern tropical Pacific ocean

    Bull. Mar. Sci.

    (2000)
  • M.A. Fernández-Álamo

    Distribution of holoplanktonic typhloscolecids (Annelida-Polychaeta) in the eastern tropical Pacific Ocean

    J. Plant Res.

    (2004)
  • M.A. Fernández-Álamo et al.

    Holoplanktonic polychaetes from the Gulf of Tehuantepec, Mexico

    Cah. Biol. Mar.

    (2005)
  • M.A. Fernández-Álamo et al.

    Polychaeta

  • H. Friedrich

    Lebensformtypen bei pelagischer Polychaeten

    Zool. Anz.

    (1949)
  • H. Friedrich

    Vorkommen und Verbreitung der pelagischen Polychaeten im Atlantischen Ozean. Auf Grund der Fänge der Meteor Expedition

    Kiel. Meeresforsch.

    (1950)
  • S.Yu. Gagaev et al.

    Species composition and distribution of pelagic polychaetes in the Arctic Basin

    Zool. Zh.

    (2012)
  • G. Giribet et al.

    First molecular evidence for the existence of a Tardigrada+Arthropoda clade

    Mol. Biol. Evol.

    (1996)
  • G. Giribet et al.

    Internal phylogeny of the Chilopoda (Myriapoda, Arthropoda) using complete 18S DNA and partial 28S DNA sequences

    Phil Trans R Soc Ser B

    (1999)
  • D. Glez Pena et al.

    ALTER: program-oriented format conversion of DNA and protein alignments

    Nucleic Acids Res.

    (2010)
  • B.C. Gonzalez et al.

    Anophthalmia and elongation of body appendages in cave scale worms (Annelida: Aphroditiformia)

    Zool. Scripta

    (2018)
  • C. Gravier

    Expédition Antarctique Française du "Pourquoi-Pas", dirigée par le Dr. J.-B. Charcot (1908–1910). Espèces nouvelles d'annélides polychètes

    Bull Mus d'Hist Nat

    (1911)
  • R. Greeff

    Ueber pelagische Anneliden von der Küste der Canarischen Inseln

    Zeits Wiss Chaft Zool

    (1879)
  • A.E. Grube

    Die Familien der Anneliden

    Arch. Naturgesch.

    (1850)
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