Common name: Yellowline Arrow Crab

General information

The Yellowline Arrow Crab, Stenorhynchus lanceolatus, is a distinctive and fascinating invertebrate commonly found in the marine aquarium trade. Known for its long, spider-like legs and triangular body, this species adds a unique visual interest to any reef tank. Its body is typically tan or brown with striking yellow lines running the length of its legs, which can span up to 10 inches in a mature adult.

Care

Arrow Crabs are generally easy to care for, but they do require stable water conditions and plenty of hiding spaces. They are nocturnal scavengers, feeding on detritus and small organisms within the aquarium. It's important to ensure they have enough food, as they may prey on small, slow-moving fish or other invertebrates if underfed.

Reproduction

In the home aquarium, breeding Yellowline Arrow Crabs can be a challenge. They have a complex life cycle that includes a planktonic larval stage, which requires specific conditions to survive. However, successful breeding has been reported by experienced hobbyists with well-established systems.

Symbiosis

While not known for any specific symbiotic relationships, Arrow Crabs can contribute to the tank's cleanliness by consuming detritus and uneaten food, which helps maintain a healthy environment for other tank inhabitants.

Habitat

Stenorhynchus lanceolatus is found in the Western Atlantic, from North Carolina to Brazil, including the Gulf of Mexico and the Caribbean. They inhabit various marine environments, from seagrass beds to coral reefs, typically hiding during the day and emerging at night to feed.