Abstract
Sensory and ambulatory appendages were compared between epigeal and cave species of prawn and crayfish from Mexico. The cave prawn Macrobrachium villalobosi was compared with the epigeal M. totonacum. The cave crayfish Procambarus cavernicola and P. oaxacae reddelli were compared with the epigeal P. olmecorum. In both Macrobrachium and Procambarus the antennules and antennae of the cave species were longer in proportion to carapace length than in epigeal species. In the crayfish the cave species had a longer and narrower first pereiopod, and also showed a greater development of setation on the antennules, antennae, and carapace. These are all considered examples of progressive troglomorphism. They will improve non‐visual sensory capability in the aphotic and resource‐poor cave environment.
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