InvertebrateFreshwaterBeginnerSemi aggressive

Vampire Crab

Geosesarma notophorum

Also known as: Purple Vampire Crab

Vivid purple freshwater crab that lives on land as much as in water.

✨AI-generated illustration

About

The vampire crab (Geosesarma notophorum) is one of those species that makes you do a double-take the first time you see it in person. The combination of deep purple or violet coloring across the body with bright yellow eyes gives it an appearance that feels almost theatrical, yet completely natural. Native to the Indonesian island of Java, this small crab lives along forested stream banks and in humid coastal areas, spending much of its time out of the water entirely. That semi-terrestrial lifestyle is the key thing to understand before you set one up at home. A paludarium or vivarium setup with plenty of land area, moss, hiding spots, and only a shallow water section will suit it far better than a standard aquarium. Geosesarma notophorum is relatively small, reaching only a couple of centimeters across the carapace, which makes it manageable even in a compact enclosure. They tend to be secretive and do most of their foraging at night, so dense planting and cork bark are appreciated. Despite that somewhat mysterious reputation, they are considered a beginner-friendly choice as long as the enclosure style is right. A group setup can work well, though some territorial scrapping is possible.

At a glance

Type: Invertebrate
Water: Freshwater
Temperament: Semi aggressive

Care guide

Set up a paludarium with more land than water. These crabs spend most time out of water. Use a shallow water section (2–3 inches), dense moss, cork bark, and leaf litter for hiding and foraging. Keep substrate moist but not waterlogged. Feed small amounts of sinking pellets, dried leaves, and occasional protein (bloodworms, small shrimp) a few times weekly. They're nocturnal and reclusive, so dim lighting and patience are important; don't expect constant activity. House singly or in small groups with plenty of space to reduce territorial disputes. Maintain high humidity and good ventilation to prevent mold. Avoid copper-based treatments and pesticides entirely.

Breeding

Vampire crabs have been bred in captivity with difficulty. Breeding requires stable conditions with adequate land and water sections, high humidity, and proper nutrition. Females lay eggs in moist soil or moss; specific triggers and larval rearing requirements remain poorly documented in the hobby. Success is unpredictable and rarely attempted by beginners. Consult detailed species-specific guides before attempting.