Abstract
ABSTRACT The estuarine cumacean Almyracuma proximoculi is found year-round in the immediate vicinity of intertidal fresh-water springs in the northeastern United States. Each of two intensively studied populations of A. proximoculi synchronously produce two generations per year. The following developmental stages occur: first manca, second manca, juvenile, juvenile male, mature male, juvenile female, preparatory female, marsupial female, and intermediate female. There are minor differences in life history parameters between populations and major differences between generations. Compared to the overwintering generations the summer generations have more rapid intramarsupial and extramarsupial developmental rates, have markedly lower fecundities, are shorter-lived, and produce smaller adults. These differences are apparently due to the influence of ambient temperature. Life history parameters and extramarsupial development patterns of other cumaceans are compared to those of A. proximoculi.
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