Gymnodoris De Ceylan

Overview

Gymnodoris ceylonica is a large, striking dorid nudibranch widely distributed across the Indo-Pacific region. Known for its translucent white body and vibrant coloration, this species is a voracious predator that plays an active role in its marine ecosystem.

Distribution & habitat

This species is found throughout the Indo-Pacific, including the Red Sea, the Indian Ocean, and across various Pacific archipelagos. It typically inhabits shallow environments such as sandy bottoms, seagrass beds, and areas with algae, where it may occasionally be seen in groups.

Appearance

The body of G. ceylonica is translucent white, allowing internal organs to be partially visible. It is characterized by prominent orange to bright red spots scattered across its back, often raised on small pustules. The rhinophores and the edge of the foot are highlighted by a distinct yellow-orange marginal line, and the large, circular gills feature strong red or orange-red markings along the rachis.

Biology & behavior

Primarily nocturnal, these nudibranchs are known for their aggressive hunting behavior. They are "slugivores," meaning they actively track and consume other opisthobranchs by following their slime trails. They are also known to exhibit cannibalistic tendencies, sometimes attacking members of their own species. During reproductive events, they may gather in large numbers to mate and deposit their eggs in loosely spiraled, light-yellow masses.

Feeding

As active predators, they hunt other sea slugs, such as the sea hare Stylocheilus striatus. They lack eyes and rely on chemical cues to locate prey, often engulfing smaller victims whole or biting into them to feed.