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Challenging deep-sea cosmopolitanism; taxonomic re-evaluation and biogeography of "Cythere dasyderma Brady, 1880" (Ostracoda)

Simone N. Brandao and Moriaki Yasuhara
Challenging deep-sea cosmopolitanism; taxonomic re-evaluation and biogeography of "Cythere dasyderma Brady, 1880" (Ostracoda)
Journal of Micropalaeontology (July 2013) 32 (2): 109-122

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.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 32
Serial Issue: 2
Title: Challenging deep-sea cosmopolitanism; taxonomic re-evaluation and biogeography of "Cythere dasyderma Brady, 1880" (Ostracoda)
Affiliation: Deutsches Zentrum fuer Marine Biodiversitaetsforschung, Wilhelmshaven, Germany
Pages: 109-122
Published: 201307
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 70
Accession Number: 2013-077583
Categories: Invertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 plates
Secondary Affiliation: University of Hong Kong, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201346
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