Sequential hermaphrodites, or sex changers, function as one sex early in their life, and then switch to the other (e.g. some reef fish such as angelfish, and some invertebrates such as Pandalid shrimps).
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Since the relatedness between sisters in P. exclamans is 0.39, and since P. exclamans and P. annularis have similar geographic distributions, one may presume that the sex allocation patterns of P. annularis follow that of P. exclamans.