Image of Brown box crab

Description:

The abdomens of adult males and females differ in several ways. This is the abdomen of a female, which is shown above, is broader than that of a male and is asymmetrical. The plates on the left side of the female abdomen (to the right above) are larger than those on the left. The right side of the female abdomen also has a row of small marginal plates but the left side does not. The female also has pleopods on her abdomen, which cannot be seen without pulling the abdomen away from the thorax.