Genus Mesorhabdus Sars 1905

Taisoo Park

in Taxonomy and Distribution of the Calanoid Copepod Family Heterorhabdidae

Published by University of California Press

Published in print April 2001 | ISBN: 9780520098428
Published online March 2012 | e-ISBN: 9780520916029 | DOI:
Genus Mesorhabdus Sars 1905

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This chapter describes the genus Mesorhabdus noting that Sars's original description of the species was based on M. annectens Sars 1905. It reports that subsequently, Sars (1925) found M. annectens to be a junior synonym of Heterorhabdus brevicaudatus Wolfenden 1905. It distinguishes Mesorhabdus from Disseta by the following features: it has antenna without a seta on the first exopodal segment; it is mandible with elongated teeth on the masticatory edge, with zero or two small setae on the basis, and only two or three setae on the first endophal segment; it contains maxillule with a reduced numbers of setae, one setae on the first inner lobe developed into a large spine, a small unsegmented endopod, and greatly elongated exopod occupying distal end of appendage; in maxilla, saberlike spines on the fifth and sixth lobes are greatly developed, endopod small, poorly segmented, with six setae; the coxa of the maxilliped with between four and six rather poorly developed setae; and they have the first leg without an outer seta on the basis.

Keywords: Mesorhabdus; M. annectens; Sars; Heterorhabdus brevicaudatus; Wolfenden; Disseta

Chapter.  9987 words. 

Subjects: Zoology and Animal Sciences

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