Fisheries Queensland - Do you know how to identify a mud or blue swimmer crab's gender? Inspect the shape of the abdominal flap on the underside of the crab. A female mud
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sexing vampire crabs by the belly! didn't see a lot online and no color pics so here is my attempt: : r/VampireCrabs
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Female and male triangle crabs – Crabs, crayfish and other crustaceans – Te Ara Encyclopedia of New Zealand
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Shorelines » Blog Archive Female Blue Crabs Are Running Low On Sperm—Unless They Die Young - Shorelines
![A & D; The ventral view of the male and female blue swimmer crab (P.... | Download Scientific Diagram A & D; The ventral view of the male and female blue swimmer crab (P.... | Download Scientific Diagram](https://www.researchgate.net/publication/367117568/figure/fig1/AS:11431281112996599@1673639338762/A-D-The-ventral-view-of-the-male-and-female-blue-swimmer-crab-P-pelagicus.png)