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Journal of Micropalaeontology An open-access journal of The Micropalaeontological Society
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Volume 32, issue 2
J. Micropalaeontol., 32, 109–122, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 4.0 License.
J. Micropalaeontol., 32, 109–122, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 4.0 License.

  01 Jul 2013

01 Jul 2013

Challenging deep-sea cosmopolitanism: taxonomic re-evaluation and biogeography of ‘Cythere dasyderma Brady, 1880’ (Ostracoda)

Simone N. Brandão1,2 and Moriaki Yasuhara3 Simone N. Brandão and Moriaki Yasuhara
  • 1Senckenberg am Meer, Deutsches Zentrum für Marine Biodiversitätsforschung (DZMB), Südstrand 44, Wilhelmshaven, 26382, Germany
  • 2Biozentrum Grindel und Zoologisches Museum, Universität Hamburg, Martin-Luther-King-Platz 3, Hamburg, 20146, Germany
  • 3School of Biological Sciences, Swire Institute of Marine Science, and Department of Earth Sciences, University of Hong Kong, Hong Kong SAR, China

Keywords: cosmopolitanism, geographical distribution, bathymetric distribution, taxonomy

Abstract. Cythere dasyderma Brady, 1880 was described from samples collected from all the world’s oceans during the HMS Challenger expedition in the 1870s. Subsequently, Cythere dasyderma (or Echinocythereis dasyderma, or Henryhowella dasyderma) has been recorded from the Late Eocene to Recent, from Atlantic, Arctic, Indian, Pacific and Southern oceans, and from intertidal to deep abyssal environments. However, even cursory inspection of illustrations from over 50 publications shows that several species have been included in ‘Cythere dasyderma’. Here, all syntypes of Cythere dasyderma Brady, 1880 archived in the Natural History Museum, London have been re-studied. This species is re-described, re-diagnosed and illustrated with scanning electron microscope images. Cythere dasyderma is assigned to Ayressoleberis gen. nov., which is described here. The geographical distribution of Ayressoleberis dasyderma (Brady, 1880) comb. nov. is no longer cosmopolitan, and includes only the type locality in the abyssal southeastern Pacific. Most of the specimens previously identified as Cythere dasyderma, or its synonyms, belong to other trachyleberidid genera (e.g. Henryhowella, Legitimocythere, Pennyella) and not to Ayressoleberis dasyderma comb. nov. A new species of Ayressoleberis, very similar to Ayressoleberis dasyderma comb. nov., is described and illustrated from specimens previously included amongst the syntypes of ‘Cythere acanthoderma Brady, 1880’. These latter specimens were collected from the continental slope of the southwestern Indian Ocean. This new species is left in open nomenclature herein because only two left valves are currently available.

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