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Obtusoecia (Halocyprida: Myodocopa: Ostracoda) a bipolar planktonic oceanic genus. Taxonomy, bathymetry and zoogeographical distribution

Obtusoecia (Halocyprida: Myodocopa: Ostracoda) a bipolar planktonic oceanic genus. Taxonomy, bathymetry and zoogeographical distribution
Obtusoecia (Halocyprida: Myodocopa: Ostracoda) a bipolar planktonic oceanic genus. Taxonomy, bathymetry and zoogeographical distribution
Full detailed descriptions of the two species of Obtusoecia, one of two planktonic halocyprid ostracod genera that are bipolar, demonstrate that the taxonomic separation of these two forms formerly considered to be conspecific, is valid. The segregation of the genus from Porroecia is also validated. The value of characters of limbs other than the first and second antennae particularly in defining halocyprid genera is emphasised. Zoogeographical distributions of the two species based on comprehensive compilations of both published and unpublished data show that O. obtusata is confined to the North Atlantic, whereas O. antarctica has an Antarctic circumpolar distribution. Detailed bathymetric profiles show that O. obtusata is a shallow mesopelagic species that is overwhelmingly dominant at depths of 50–200 m in subpolar seas, and shows limited ability to submerge at lower depths, so that it is restricted to seas that have a marked seasonal cycle of turn-over and stratification. It is postulated that the bathymetric distributions of the two species are similar, also that O. antarctica is more likely to be ancestral to O. obtusata than vice versa.
Obtusoecia, halocyprid ostracods, taxonomy, bathymetry, zoogeography, bipolarity
0003-4541
197-213
Angel, M.V.
bf0576de-ee5d-40b3-b4ca-aea7ed75863a
Blachowiak-Samolyk, K.
5e3304e0-6a91-4d06-a7be-beec0cf47112
Angel, M.V.
bf0576de-ee5d-40b3-b4ca-aea7ed75863a
Blachowiak-Samolyk, K.
5e3304e0-6a91-4d06-a7be-beec0cf47112

Angel, M.V. and Blachowiak-Samolyk, K. (2006) Obtusoecia (Halocyprida: Myodocopa: Ostracoda) a bipolar planktonic oceanic genus. Taxonomy, bathymetry and zoogeographical distribution. Annales Zoologici, 56 (1), 197-213.

Record type: Article

Abstract

Full detailed descriptions of the two species of Obtusoecia, one of two planktonic halocyprid ostracod genera that are bipolar, demonstrate that the taxonomic separation of these two forms formerly considered to be conspecific, is valid. The segregation of the genus from Porroecia is also validated. The value of characters of limbs other than the first and second antennae particularly in defining halocyprid genera is emphasised. Zoogeographical distributions of the two species based on comprehensive compilations of both published and unpublished data show that O. obtusata is confined to the North Atlantic, whereas O. antarctica has an Antarctic circumpolar distribution. Detailed bathymetric profiles show that O. obtusata is a shallow mesopelagic species that is overwhelmingly dominant at depths of 50–200 m in subpolar seas, and shows limited ability to submerge at lower depths, so that it is restricted to seas that have a marked seasonal cycle of turn-over and stratification. It is postulated that the bathymetric distributions of the two species are similar, also that O. antarctica is more likely to be ancestral to O. obtusata than vice versa.

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More information

Published date: 2006
Keywords: Obtusoecia, halocyprid ostracods, taxonomy, bathymetry, zoogeography, bipolarity

Identifiers

Local EPrints ID: 44199
URI: http://eprints.soton.ac.uk/id/eprint/44199
ISSN: 0003-4541
PURE UUID: dd5e2b96-0a12-4f85-9b11-c2e15bb46c7a

Catalogue record

Date deposited: 19 Feb 2007
Last modified: 13 Mar 2019 21:07

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