Nature Field Guide
Black Spiny Brittle Star
- Spanish name
- Ofiura negra espinosa
- Scientific name
- Ophiocoma aethiops
What Do Pico & Tati Think?
A thin arm at the edge of a shelter can be an entire discovery. Pico waits quietly; Tati draws only what is visible.
Species overview
About the Black Spiny Brittle Star
Ophiocoma aethiops is a brittle star with a distinct central disc and long, flexible, spiny arms. Brittle stars belong to a different class from ordinary sea stars. This species uses rocky marine settings, where much of an individual may be hidden. A partly hidden animal should stay that way.
Identification
Key Features of the Black Spiny Brittle Star
A central disc distinct from the arms
Long slender arms with visible spines
Only part of the animal may be visible naturally
Habitat & range
Suitable underwater coastal habitat. Use a permitted guided snorkeling or viewing activity appropriate to your family; do not enter the sea just to find this animal.
Local observations
Documented in Guanacaste. Also recorded at Isla del Coco (Oceanic Pacific); the museum checklist uses Ophiocoma alexandri for Ophiocomella alexandri. Region tags represent documented locations, not an exhaustive range or a promise of occurrence at every beach. Additional regional assignments require locality evidence.
When to observe
Visibility depends on the site, conditions and the animal. Ask a local guide about an appropriate visit; no fixed encounter season is promised.
Conservation & care
Watch without touching, lifting, feeding or collecting. Keep fingers and equipment away from spines and other surface structures. Leave the animal submerged and its habitat undisturbed.
Observation activity
Draw a shelter with one visible arm. Label the hidden part with a question mark rather than trying to uncover it.