Somite size variation during copepodid development of podoplean copepods

In: Crustaceana
Frank D. Ferrari, 2924 NE 22nd Avenue, Portland, OR 97212, U.S.A.

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J. Carel von Vaupel Klein, Rembrandtlaan 57, NL-3723 BG Bilthoven, The Netherlands

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Reports of podoplean first copepodids with more or fewer than the ancestral two narrow somites are considered. On some poecilostomatoids, the fourth and fifth thoracic somites, and the anal somite appear narrow on the first copepodid. Further development of the body during the copepodid phase includes only transformations or additions of narrow somites. Some caligid siphonostomatoids also have the same three narrow somites on the first copepodid. Reanalysis of their copepodid development indicates not only transformations and additions of narrow somites but also the incorporation of broad somites into the cephalothorax, and a failure to form the middle and posterior limbless abdominal somites. Support for one narrow somite on the first copepodid is unconvincing.

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