All hermit crabs have a large pincer and a small pincer. Female hermit crabs have two small spots called gonopores that will be visible when you look at the top of your hermit crab's back walking legs. How Do You Know If a Hermit Crab Is a Boy or a Girl? The girls will have to symmetrical dots where her eggs would come out. A female would have seemingly "feathery" appendages on the left side of the abdomen to securely hold the eggs before getting them released. the underside of the hermit crab,next to the tail. (Fox, S. 2000) References: Harvey, A. Some say that hermit crabs might even be able to change their gender during their lifetimes. Don't listen to the person above me, Petco doesn't know diddly dik about hermit crabs. 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. It is also believed that a male hermit crab has hairy legs, which is most noticeable on the 5th pair of legs. Hermit crabs that are healthy will move their antennae in a "healthy looking" fashion. If you look at a crab’s underside, there’s a flap with a distinct shape. Most crab-care books state that it is impossible to tell the sex between male and female land hermit crabs. here's a picture and more info on how to do it. And the boys won't have those. If has two holes near its mini legs, it is a girl.If it has multiple crosses, it is a boy. Gonopores are tiny round openings and can be found at the base of a hermit crab's last pair of legs. If there is a small dot on each leg then it is female. Even experts have a hard time figuring … Text from a personal email regarding determining the gender of a land hermit crab.Shared with permission. The colour and shapes of these claws only indicate species not gender. 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. the way to tell gender is to look underneath on the very last set of exposed legs. Male blue crabs (Jimmies) have a long, pointy apron as seen in the first picture below. The female land hermit crab has … A demonstration on determining the sex of Dungeness crabs and showing the difference between them. It actually is really hard for the average person to be able to tell the gender of hermit crabs. If your crab has two gonopores it means it's a … This flap is referred to as the apron. A second way to tell the difference between males and females is by the shape of their “apron”. It's very hard to know for sure what the gender of a hermit crab is. This is also where the male reproductive organ is located. Male hermit crabs don't have legs on their abdomen. They also feed well and are about and active often. 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