Abstract
ABSTRACT Phronima, Lycaea, and Vibilia are 3 different genera of hyperiid amphipods that differ greatly in external morphology, ecology, and possibly phyletic history. These 3 genera have 4 distinct morphological types of sensilla arranged in bilaterally symmetrical, serially homologous sets on successive body segments. Vibilia has all 4 morphological types and the greatest density of sensilla. Phronima has 2 morphological types but the fewest number of sensilla. Lycaea has only 1 type that is distributed on every segment. One sensilla type (fluted hair on Vibilia) has not been previously reported. The probable functions of these sensory hairs is discussed in relation to other crustacean sensilla.
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