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RELATIONSHIP BETWEEN GROWTH, SIZE, MOLTING, AND NUMBER OF ANTENNAL SEGMENTS IN ORCHESTIA TRASKIANA STIMPSON (AMPHIPODA, TALITRIDAE) BY HENRY M. PAGE Marine Science Institute, University of California, Santa Barbara, U.S.A. . INTRODUCTION Growth in crustaceans is the result of interplay between two components: molt increment or the dimensional increase in size at molt, and intermolt interval or the frequency with which molting takes place. Because crustaceans loose all hard parts on molting, leaving no record of previous molts, it is difficult to determine directly the number of molts that a crustacean, taken from the field, has passed through to a given size. Indirect techniques have been applied to the bathy- pelagic mysid, Gnathophausia ingens (Dohrn) and the deep water majid crabs Chionoecetes opilio (0. Fabricius) and C. tanneri Rathbun (cf. Childress, in prep.; Ito, 1970; Tester, unpubl.). Studies on amphipods have suggested that some members of the semi-terrestrial and terrestrial family Talitridae add one or more articles to the flagellum of the second antennae consistently on molting (Charniaux-Cotton, 1957; Duncan, 1969; Wildish, 1972; Tamura & Koseki, 1974). If a particular amphipod species added flagellar segments (podomeres) on molting in a consistent pattern, then one might have a relatively reliable
Crustaceana – Brill
Published: Jan 1, 1979
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