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Cover illustration. The horseshoe shrimp Hutchinsoniella macracantha belongs to the ancient crustacean taxon of Cephalocarida. Its external morphology and neuroanatomy exhibit several plesiomorphic structures and patterns dating back to the ancestor of all Tetraconata. In this issue of the Journal of Morphology, Stegner and coauthors (pp. 269–294) studied the ventral nerve cord of adult Hutchinsoniella...
Cephalocarida are Crustacea with many anatomical features that have been interpreted as plesiomorphic with respect to crustaceans or Tetraconata. While the ventral nerve cord (VNC) has been investigated in many other arthropods to address phylogenetic and evolutionary questions, the few studies that exist on the cephalocarid VNC date back 20 years, and data pertaining to neuroactive substances in...
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