Taxonomy and Distribution of the Antarctica Species Group of the Genus Euchaeta (Copepoda, Calanoida)
- Louis S. Kornicker
Published Online: 16 MAR 2013
Copyright 1988 by the American Geophysical Union.
Biology of the Antarctic Seas XIX
How to Cite
Fontaine, M. (1988) Taxonomy and Distribution of the Antarctica Species Group of the Genus Euchaeta (Copepoda, Calanoida), in Biology of the Antarctic Seas XIX (ed L. S. Kornicker), American Geophysical Union, Washington, D. C.. doi: 10.1029/AR047p0027
- Published Online: 16 MAR 2013
- Published Print: 1 JAN 1988
Print ISBN: 9780875901718
Online ISBN: 9781118666074
- Marine biology—Antarctic regions—Collected works
The five southernmost species of the genus Euchaeta (Copepoda, Calanoida) form a natural taxonomic group, here named the Euchaeta antarctica species group. Specimens of Euchaeta antarctica Giesbrecht, E. erebi (Farran) , E. similis Wolfenden, E. tycodesma Park, and E. austrina Giesbrecht were studied from 154 midwater trawl samples collected by USNS Eltanin in Antarctic and Subantarctic waters. The close relationship of the species to one another is shown by analysis of taxonomic characters of the genital segment, mandible, first maxilla, and first leg of the female and of the fifth pair of legs of the male. Differences between the group and other euchaetid copepods are also discussed. Distributions of the five species are given and discussed with respect to water movements. All five are truly Antarctic species. Euchaeta antarctica. E. erebi, E. similis. and E. tycodesma are regular inhabitants of the shelf waters near and under the Ross Ice Shelf. E. antarctica is common in all sectors of the Antarctic Ocean and also occurs north of the Antarctic Convergence in the Atlantic, Pacific, and Indian oceans. E. erebi is restricted to shelf waters of the Ross Sea. E. similis and E. tycodesma, although most abundant in Ross Sea shelf waters, are also occasionally found in Circumpolar Deep Water. E. austrina, known previously only from the Bellingshausen Sea and from deep water north of Queen Maud Land, occurs in Eltanin samples in Circumpolar Deep Water in the southwestern part of the Ross Sea and in the northern part of the Weddell Sea.