Common name: Urchin Spine Snail

General information

The Urchin Spine Snail, Echinostrephus aciculatus, is a unique gastropod that has adapted to live in close association with sea urchins. Its shell is elongated and pointed, resembling the spines of its urchin hosts, which provides camouflage and protection from predators. This species is not commonly found in the aquarium trade but can be a fascinating addition to a reef tank with a focus on biodiversity and natural symbiotic relationships.

Care

Caring for Urchin Spine Snails requires an environment that mimics their natural habitat. They are best suited for established reef aquariums with ample live rock and a stable population of sea urchins. These snails are scavengers, feeding on detritus and leftover food, which helps keep the tank clean. They are sensitive to water quality, so regular water changes and monitoring of water parameters are essential.

Reproduction

Little is known about the reproductive habits of Echinostrephus aciculatus in the aquarium. In the wild, they are likely to have a similar reproductive strategy to other marine snails, laying eggs in a gelatinous mass that will develop into free-swimming larvae before settling down and metamorphosing into their adult form.

Symbiosis

Echinostrephus aciculatus exhibits a fascinating form of commensalism with sea urchins. The snail's shell shape and coloration allow it to blend in with the spines of its host, providing a form of camouflage against predators. While the snail benefits from this association, the sea urchin does not seem to be affected positively or negatively.

Habitat

This species is typically found in the Indo-Pacific region, from the Red Sea to the Western Pacific. They inhabit coral reefs and are often associated with sea urchins in the genera Diadema and Echinothrix, among others.