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The dorsal integument of nearly all species of Peripatidae—one of the two major subgroups of Onychophora (velvet worms)—typically exhibits 12 plicae (=annuli) per segment. The only exception might occur in Plicatoperipatus jamaicensis, from which 24 putative plicae per segment have been reported. Hence, the number of plicae might have been duplicated in this species. If so, one would expect that the...
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