Abstract
Comparatively large ova, low fecundity and low per capita egg production are adaptations to terrestrial habits in Uca subcylindrica. An unusual morphology of the genitalia appears to have co-evolved with the necessity for a lecithotrophic egg. Isolated populations are apparently sustained by rapid larval development. The crab stage population has a bimodal size-frequency distribution with an intermediate sex ratio pattern. Initially the sexes are equal, but males are more common in the larger size classes. Survival into the crab stage is relatively low. There is an increased rate of mortality with size. Only 30% of the individuals grow to modal carapace size; even fewer appear to participate in reproduction.
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