Vampire Crab: Species Profile

The Vampire Crab (Geosesarma dennerle) is a captivating semi-terrestrial crustacean known for its vibrant purple coloration and striking yellow eyes. Originating from the dense forests of Java, Indonesia, these crabs have gained popularity among aquarists for their unique appearance and intriguing behaviors.

Species Overview

• Common Names: Vampire Crab
• Scientific Name: Geosesarma dennerle
• Adult Size: Approximately 1 inch (2.5 cm) carapace width; leg span up to 2 inches (5 cm)
• Life Expectancy: Up to 2 years

Characteristics

• Family: Sesarmidae
• Origin: Java, Indonesia
• Social: Semi-social; can be kept in groups with adequate space
• Tank Level: Primarily terrestrial; requires both land and water areas
• Minimum Tank Size: 10 gallons
• Diet: Omnivore
• Breeding: Direct development; juveniles resemble miniature adults
• Care Level: Intermediate
• pH: 7.5 to 8.0
• Hardness: 4 to 16 dGH
• Temperature: 75–82°F (24–28°C)

Origin and Distribution

Vampire Crabs are endemic to the island of Java in Indonesia. They inhabit humid forest floors near freshwater streams and rivers, often seeking shelter among rocks and dense vegetation.

Colors and Markings

These crabs are distinguished by their deep purple carapace and legs, contrasted with bright yellow eyes. The vivid coloration makes them a standout species in any terrarium or paludarium setup.

Tankmates

Vampire Crabs can coexist with certain species, provided their specific habitat needs are met. Suitable tankmates include:

• Small, non-aggressive fish that thrive in similar water conditions
• Snails
• Shrimp

It’s essential to avoid housing them with larger or aggressive species that might pose a threat.

Habitat and Care

To replicate their natural environment:

• Tank Setup: Create a paludarium with approximately 80% land and 20% water. Use a substrate mix of sand and soil to facilitate burrowing. Incorporate hiding spots using rocks, driftwood, and live plants to provide cover and climbing opportunities.
• Water Parameters: Maintain clean, dechlorinated freshwater with a pH between 7.5 and 8.0. Regular water changes are crucial to prevent the buildup of harmful substances.
• Humidity and Temperature: Ensure ambient humidity levels are around 75% or higher. Keep the temperature between 75–82°F (24–28°C) to support their health and activity.

Diet and Feeding

Vampire Crabs are omnivorous scavengers. A balanced diet includes:

• Commercial crab pellets
• Fresh vegetables like spinach and zucchini
• Protein sources such as bloodworms, brine shrimp, and earthworms

Feed them once daily, removing any uneaten food to maintain water quality.

Gender Differences

Males typically have a narrower, more pointed abdominal flap, while females possess a broader, rounded flap. Males may also exhibit slightly larger claws compared to females.

Breeding

Breeding Vampire Crabs in captivity can be challenging but is achievable with proper conditions:

• Mating: Occurs on land, with the male climbing onto the female to fertilize the eggs.
• Egg Carrying: Females carry fertilized eggs under their abdomen for about a month.
• Hatching: Juveniles emerge as miniature versions of adults, bypassing a larval stage. Providing ample hiding spots and a nutrient-rich environment supports their growth.

Further Research

For those interested in similar species, consider exploring:

• Red Devil Crab (Geosesarma hagen)
• Panther Crab (Parathelphusa pantherina)
• Thai Micro Crab (Limnopilos naiyanetri)

These species share comparable care requirements and can offer unique additions to a semi-aquatic setup.

FAQ

• How many Vampire Crabs can be kept together? A group of up to six can be housed in a 10-gallon tank, provided there are sufficient hiding spots and territory to minimize aggression.
• Are Vampire Crabs suitable for beginners? They require specific habitat conditions and attentive care, making them more suitable for aquarists with some experience.
• Can Vampire Crabs live fully aquatic lives? No, they are semi-terrestrial and need both land and water areas to thrive. A fully aquatic environment would not meet their physiological needs.

By providing a habitat that closely mimics their natural environment and attending to their specific care requirements, Vampire Crabs can be a fascinating and rewarding addition to a semi-aquatic terrarium or paludarium.