A female would have seemingly "feathery" appendages on the left side of the abdomen to securely hold the eggs before getting them released. 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. A demonstration on determining the sex of Dungeness crabs and showing the difference between them. Even experts have a hard time figuring … This flap is referred to as the apron. Male hermit crabs don't have legs on their abdomen. Some say that hermit crabs might even be able to change their gender during their lifetimes. 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. Gonopores are tiny round openings and can be found at the base of a hermit crab's last pair of legs. 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. If has two holes near its mini legs, it is a girl.If it has multiple crosses, it is a boy. (Fox, S. 2000) References: Harvey, A. It's very hard to know for sure what the gender of a hermit crab is. If your crab has two gonopores it means it's a … The girls will have to symmetrical dots where her eggs would come out. This is also where the male reproductive organ is located. The female land hermit crab has … A hermit crab that is gravid (carrying eggs) will look like the drawing by Alcock, below. Hermit crabs that are limp … Male blue crabs (Jimmies) have a long, pointy apron as seen in the first picture below. 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. Most crab-care books state that it is impossible to tell the sex between male and female land hermit crabs. If there is a small dot on each leg then it is female. If you look at a crab’s underside, there’s a flap with a distinct shape. And the boys won't have those. How Do You Know If a Hermit Crab Is a Boy or a Girl? All hermit crabs have a large pincer and a small pincer. A second way to tell the difference between males and females is by the shape of their “apron”. Hermit crabs that are healthy will move their antennae in a "healthy looking" fashion. Text from a personal email regarding determining the gender of a land hermit crab.Shared with permission. "A female crab attaches her eggs to the fine setae on her pleopods using a gluelike substance." They also feed well and are about and active often. here's a picture and more info on how to do it. if there is no dot then it is male. 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