Chapter

Family Heterorhabdidae Sars 1902

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: http://dx.doi.org/10.1525/california/9780520098428.003.0003
Family Heterorhabdidae Sars 1902

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This chapter describes Heterorhabdidae which can be distinguished not only from the other families of the superfamily Arietelloidea but also from all other calanoid families by these three characters: the left caudal ramus is normally fused to the anal segment, and it is longer than the right ramus; the fourth marginal seta (counted from the lateral) of the left ramus is naked and greatly elongated; and finally the basis of the male right P5 has a large, plumose inner lobe, which in some taxa is extremely large. It notes that these three characters are highly pronounced in all species examined in the study except for Paraheterorhabdus (Antirhabdus) compactus, in which the left caudal ramus is only slightly longer than the other marginal setae but not greatly elongated. It further notes that these character states of this species are believed to be reductive rather than primitive because the species shows an advanced stage of evolution in all other morphological features.

Keywords: Heterorhabdidae; Arietelloidea; calanoid families; species; Paraheterorhabdus compactus; character states; evolution; morphological features

Chapter.  3317 words. 

Subjects: Zoology and Animal Sciences

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