Common name: whitestripe urchin shrimp

General information

Stegopontonia commensalis is a fascinating species of shrimp that has garnered attention for its unique symbiotic relationship. This small, cryptic shrimp is part of the Palaemonidae family and is often found living within the branches of certain sea urchins, specifically those of the genus Diadema. Its coloration and patterns are well-suited for camouflage among the urchin's spines, providing it with protection from predators.

Care

In the aquarium, Stegopontonia commensalis requires a setup that mimics its natural habitat. This includes the presence of a suitable sea urchin host, such as @species:diadema-setosum, to provide the necessary shelter and protection. Hobbyists should ensure a stable environment with high water quality, moderate to strong water flow, and plenty of live rock for additional hiding places.

Reproduction

Little is known about the reproductive habits of Stegopontonia commensalis in the wild or in captivity. However, like many marine shrimps, they are likely to have a planktonic larval stage that disperses into the water column before settling down and finding a host.

Symbiosis

The most notable aspect of Stegopontonia commensalis is its symbiotic relationship with sea urchins, particularly Diadema species. The shrimp benefits from the protection offered by the urchin's spines, while the urchin may gain from the shrimp's cleaning services, as it removes parasites and detritus from the urchin's body.

Habitat

Stegopontonia commensalis is typically found in the Indo-Pacific region, residing within the protective spines of sea urchins in coral reef environments. They are adapted to a life of commensalism, which allows them to thrive in areas where their host urchins are present.