Males are larger than females, and have a much larger claw. Color translucent whitish, some internal colored organs visible (pink, orange, or yellow the reproductive organs are coral-colored). The larger chela, when closed, has a gap between the propodus and dactyl (photo) and the carpus of the smaller chela is substantially wider than the merus (photo). The eyestalks are flattened and pointed, and the cornea of the eye is mid-dorsal on the flattened eyestalk (photo). Neotrypaea californiensis has a bluntly rounded rostrum (photo) and a smooth carapace. As a member of family Callianassidae, its rostrum is a small tooth, not hairy and its chelipeds are chelate and unequal in size. As a Thalassinidean, Neotrypaea has a broad, extended abdomen and well-developed tail fan (photo).
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