Circle-Marked Brittle Star

Ophioderma cinereum

The Circle-marked Brittle Star is identifiable by its distinct appearance, featuring a central disc with long, slender arms that can be easily mistaken for other brittle star species. It typically adopts a cryptic posture among coral reefs, seagrass beds, and rubble, making it adept at blending into its surroundings. This species is found in the Western Central Atlantic, particularly in Belize and Costa Rica, and inhabits a depth range from 0 to 173 meters, although most occurrences are shallower than 40 meters. In its natural habitat, the Circle-marked Brittle Star is often seen in exposed positions on mangrove peat banks or hidden within reef structures. Its diet primarily consists of small invertebrates, which it captures using its long, flexible arms. The species reproduces through lecithrotrophic larvae, a method that allows for a unique developmental process in the marine environment. Diving encounters with the Circle-marked Brittle Star can be intriguing, as divers may spot it nestled among corals or moving gracefully across the substrate. While not evaluated by the IUCN, its conservation status remains uncertain, and it is essential for divers to observe and document their encounters to contribute to ongoing marine research.