HOW TO SEX VAMPIRE CRABS - IDENTIFYING MALE & FEMALE VAMPIRE CRABS
How to sex vampire crabs - a complete guide
Learn how to sex Geosesarma Vampire Crabs
Determining the sex of crab species can vary depending on the specific species and their characteristics. However, here are some general guidelines that can help in identifying the sex of crabs, especially when it comes to Vampire Crabs (Geosesarma)
External Morphology (MALE)
Male crabs typically have a narrower, triangular-shaped abdomen and male crabs often have larger claws or pincers, which they use for fighting and attracting mates.
Male Geosesarma Vampire Crab Bottom View
Male Geosesarma Vampire Crab Front View
External Morphology (FEMALE)
Females on the other hand have broader, more rounded abdomens and smaller claws or pincers.
Female Geosesarma Vampire Crab Bottom View
Female Geosesarma Vampire Crab Front View
Female crabs have a wider abdominal flap, which is used to carry and protect eggs.
Size and Shape
Males are usually larger than females,
The shape of the carapace (the hard upper shell) may differ between sexes, with males having a more angular or elongated carapace compared to females. Though this is usually quite subtle.
Secondary Sexual Characteristics
During the mating season, male crabs may develop secondary sexual characteristics such as minor colouration changes
Female crabs may exhibit signs of carrying eggs on their abdomen, appearing as a mass of small spheres attached to the underside of the abdomen.
How to tell the difference between male and female vampire crabs