Brown Brittle Star

Overview

The Brown Brittle Star (Ophioderma longicaudum) is a prominent echinoderm found in the Mediterranean Sea and parts of the eastern Atlantic Ocean. Known for its robust, snake-like appearance, this species is frequently encountered by divers in shallow coastal waters. It is a shy, light-sensitive animal that typically remains hidden during the day.

Distribution & habitat

This species is widely distributed throughout the Mediterranean and along the eastern Atlantic coast, ranging from Brittany down to the Canary Islands. It favors rocky, sandy, or coralligenous seabeds where it can find shelter. It is a photophobic, shade-loving creature that spends much of its time tucked away in rock crevices, under stones, or within holes to avoid direct light.

Appearance

Ophioderma longicaudum is a large, fleshy brittle star. It features a central, pentagonal disc that is coriaceous (leathery) and finely granulated, typically measuring about 3 cm in diameter. Its five long, muscular arms can reach 12–15 cm and are circular in cross-section. The coloration is variable, ranging from reddish-orange to dark brown, often with distinct green and dark banding along the arms. Short, flattened spines line the arms, contributing to its smooth, sleek look.

Feeding

This brittle star is an active feeder that consumes a variety of small marine organisms. Its diet primarily consists of bivalves and worms, which it captures using its highly mobile and flexible arms.