Common name: yellowline arrow crab

General information

The Yellowline Arrow Crab, scientifically known as Stenorhynchus seticornis, is a distinctive and fascinating invertebrate commonly found in the marine aquarium trade. Its long, spider-like legs and triangular body give it a unique appearance that can add intrigue to any reef tank. This species is known for its beneficial role in controlling bristle worm populations, which can sometimes become pests in reef aquariums.

Care

Arrow Crabs are relatively easy to care for, but they do require stable water conditions and plenty of hiding spaces. They are nocturnal, so they prefer to have a dimly lit tank or areas where they can retreat from the light during the day. They are opportunistic feeders, scavenging for detritus and consuming small, unwanted pests.

Reproduction

In the home aquarium, breeding Yellowline Arrow Crabs can be challenging. 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.

Symbiosis

While not involved in the classic symbiotic relationships seen with some fish and corals, Arrow Crabs can be considered beneficial tank members due to their pest control abilities. They are particularly adept at hunting down bristle worms, which can be a nuisance in reef tanks.

Habitat

Stenorhynchus seticornis is typically found in the Atlantic Ocean, from the Carolinas in the United States, down to Brazil, including the Gulf of Mexico and the Caribbean Sea. They inhabit a range of depths, often associating with coral reefs, rocky substrates, and seagrass beds.