Max Size: 5cm

Red Devil Crab (Geosesarma Hagen)

The Red Devil Crab is a semi-terrestrial species that is attractively marked. These Crabs do well in a semi-aquatic environment, and they thrive in captivity. Red Devil Crabs are an excellent choice for nano aquariums or paludariums.

Red Devil Crabs get on well with their own kind and can be kept in groups and are generally peaceful, although males may, on occasion, clash for territory. While it gets on with its own species, it is often aggressive with other types of Crabs, including other Vampire Crab species. You can house these Crabs with small fish, Crayfish, Frogs, and other Amphibians. They have fascinating behaviours and are pretty active during the day, very hardy and easy to keep.

Red Devil Crabs are a dark brown colour with the claws and parts of the carapace being bright orangey-red on the adults. They have bright yellow eyes, which contrast distinctly with their orange abdomens. They have two small claws that are similar in size. The claws do not open very wide, so they are not able to pinch you.


Red Devil Crab
Red Devil Crab
Red Devil Crab
Red Devil Crab
Quick Facts
Scientific NameGeosesarma Hagen
Other NamesGeosesarma Red Devil, Geosesarma sp "rot"
Aquarium LevelBottom
DifficultyBeginner - Intermediate
Best kept asGroups 5+
Lifespan2 - 3 years
Water Parameters
Water TypeFreshwater
PH7.0 - 8.5
GH4 - 16
KH0 - 10
75 - 82℉
23.9 - 27.8℃


Red Devil Crabs are omnivorous scavengers and eager hunters on occasion. It feeds on detritus and filamentous algae in the aquarium and readily accepts high-quality dry foods rich in plant material, including sinking flakes and pellets.

Dried and fresh vegetables are also excellent food sources, as well as other invertebrates, worms and insects. The Red Devil Crab may eat other ornamental invertebrates and fish because of its opportunistic nature, so you must choose their tankmates wisely.

Sexual Dimorphism

It is relatively straightforward to distinguish male from female Red Devil Crabs. Males are usually larger than females and have much larger claws, and the shaded part of the abdomen in males is narrower than the females.

Other Crabs of interest

Date Added: 22/04/2021 10:07:28 - Updated: 17/11/2021 03:32:08