Hermit crabs that are healthy will move their antennae in a "healthy looking" fashion. They also feed well and are about and active often. If you look at a crab’s underside, there’s a flap with a distinct shape. Male blue crabs (Jimmies) have a long, pointy apron as seen in the first picture below. Unless you can get the crab all the way out of its shell and then look on its underside, then you will be able to tell if its a boy or girl. A second way to tell the difference between males and females is by the shape of their “apron”. Don't listen to the person above me, Petco doesn't know diddly dik about hermit crabs. if there is no dot then it is male. Gonopores are tiny round openings and can be found at the base of a hermit crab's last pair of legs. Some say that hermit crabs might even be able to change their gender during their lifetimes. (Fox, S. 2000) References: Harvey, A. Text from a personal email regarding determining the gender of a land hermit crab.Shared with permission. It's very hard to know for sure what the gender of a hermit crab is. If has two holes near its mini legs, it is a girl.If it has multiple crosses, it is a boy. Male hermit crabs don't have legs on their abdomen. Hermit crabs that are limp … The female land hermit crab has … A hermit crab that is gravid (carrying eggs) will look like the drawing by Alcock, below. It is also believed that a male hermit crab has hairy legs, which is most noticeable on the 5th pair of legs. This is also where the male reproductive organ is located. If there is a small dot on each leg then it is female. This flap is referred to as the apron. It actually is really hard for the average person to be able to tell the gender of hermit crabs. the way to tell gender is to look underneath on the very last set of exposed legs. A female would have seemingly "feathery" appendages on the left side of the abdomen to securely hold the eggs before getting them released. The most reliable way to determine a hermit crab's sex is to search for the Gonopores, their presence or absence will tell you the crab's gender. here's a picture and more info on how to do it. If your crab has two gonopores it means it's a … A demonstration on determining the sex of Dungeness crabs and showing the difference between them. the underside of the hermit crab,next to the tail. All hermit crabs have a large pincer and a small pincer. Even experts have a hard time figuring … The girls will have to symmetrical dots where her eggs would come out. Most crab-care books state that it is impossible to tell the sex between male and female land hermit crabs. The colour and shapes of these claws only indicate species not gender. How Do You Know If a Hermit Crab Is a Boy or a Girl? And the boys won't have those. Actually I have found that is not that difficult, provided your hermit crab is willing to come rather far out of its shell for you. 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