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GROWTH IN UCA, 1. ONTOGENY OF ASYMMETRY IN UCA PUGILATOR (BOSC) (DECAPODA, OCYPODIDAE) BY DON CURTIS MILLER Department of Biological Sciences, Union College, Schenectady, New York 12308, U.S.A.1) INTRODUCTION The striking asymmetry in male fiddler crabs is the consequence of disproportionate growth and alteration of form of one of the chelipeds. The resulting heterochelate condition is a characteristic feature of this genus, although sexual dimorphism with regards to crustacean appendages is certainly not uncommon in this class (Teissier, 1960). This paper describes the morphological development of the major cheliped and differential growth within adjacent pairs of walking legs in an ontogenetic series of Uca pugilator. Heterochely in the Brachyura has been much studied by investigators interested in problems of relative growth and development of form. Accordingly, it is not surprising that Uca has received some attention by these workers, although to date only the adult stage has been considered. Yerkes (1901) published a morphometric description of heterochely in U. pugilator and, significantly, reported asymmetrical growth in several other features, namely in the first several pairs of walking legs, which are slightly longer on the major chelar side, and a slight antero-lateral enlargement of the carapace on the same side.
Crustaceana – Brill
Published: Jan 1, 1973
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