Abstract
ABSTRACT Two distinct types of calceoli are reported from Gammarellus angulosus. The small "gammarellid type" is found on the peduncle and encircles the flagellar segments of the first and second antennae of immature and mature animals. The large "pontogeneiid type" calceoli are found singly on the flagellar segments of mature males. The presence of two types of calceoli on one species indicates that calceolar morphology should be used with caution in the higher classification of gammaridean amphipods.
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