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Two new species of Cossura (Cossuridae, Annelida) from the terminal lobes of the Congo River deep-sea fan

Published online by Cambridge University Press:  15 February 2017

Anna Zhadan
Anna Zhadan*
Affiliation:
Biological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow 19421, Russia
*
Correspondence should be addressed to: A. Zhadan, Biological Faculty, M.V. Lomonosov Moscow State University, Leninskie Gory 1-12, Moscow 19421, Russia email: azhadan@wsbs-msu.ru
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Abstract

Two new species of Cossura Webster & Benedict, 1887 were found in material collected during sampling from the terminal lobes of the Congo deep-sea fan. They were described using light and scanning electron microscopy. Cossura platypus sp. nov. has 15–17 thoracic chaetigers, a prostomium longer than it is wide, with a widely rounded anterior margin, an abruptly expanded posterior prostomial ring the same length as the peristomium, without a mid-ventral notch, a branchial filament attached to the midlength of chaetiger 3, and a pygidium with three anal cirri. Cossura platypus sp. nov. is similar to C. brunnea Fauchald, 1972 but differs in the shape of the prostomium, which is widely rounded anteriorly in C. platypus sp. nov. and is broadly triangular in C. brunnea; furthermore, C. platypus sp. nov.is uniformly pale, whereas C. brunnea has dark pigmentation. Cossura candida Hartman, 1955 differs from C. platypus sp. nov. in the conical shape of the prostomium and 24–35 thoracic chaetigers. Cossura flabelligera sp. nov. has 16–19 thoracic chaetigers, a conical prostomium, and a branchial filament arising from the posterior part of chaetiger 2; the entire body, including the chaetae, is covered by a thick mucous sheath similar to the tunic of flabelligerids. Cossura flabelligera sp. nov. resembles C. longocirrata Webster & Benedict, 1887 in the position of the branchial filament, the shape of the prostomium, and the number of thoracic chaetigers; it differs in having a thick mucous sheath. This character seems to be unique for the Cossuridae.

Keywords

AnnelidapolychaetesCossuridaeCossuraCossura platypusCossura flabelligeraWest AfricaCongo lobesdeep sea fan
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 97 , Special Issue 5: Proceedings of the 12th International Polychaete Conference Amgueddfa Cymru - National Museum Wales Cardiff, Wales, UK, 1-5 August 2016 , August 2017 , pp. 881 - 888
Copyright
Copyright © Marine Biological Association of the United Kingdom 2017 

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Footnotes

Zoobank identifier:LSID urn:lsid:zoobank.org:pub:ED1510A9-8963-4B97-9F2F-B2E201526098

References

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