Nudibranch – Dermatobranchus pustulosus

Dermatobranchus pustulosus, commonly known as the Dermatobranchus pustulosus, is a species of colorful sea slug, a nudibranch, belonging to the Arminidae family. These marine gastropods are known for their striking appearance and fascinating adaptations.

Description & Characteristics

Dermatobranchus pustulosus is a relatively small nudibranch, reaching a maximum size of about 20 millimeters. Its body is typically white or cream-colored, adorned with numerous brown or reddish-brown pustules, giving it a distinctive, bumpy texture. These pustules are often arranged in rows along the back, contributing to its unique appearance. The species has a pair of rhinophores (sensory organs) at the head, which are club-shaped and bear numerous small papillae. Dermatobranchus pustulosus also possesses a pair of cerata (projections along the back) that are lined with cnidosacs, which store stinging cells obtained from its prey.

Habitat and Occurrence

Dermatobranchus pustulosus is primarily found in the Indo-Pacific region, where it is a common sight in tropical and subtropical waters. It is typically observed on shallow reefs, often clinging to the surfaces of various hard corals. The species is primarily a shallow-water dweller, with a depth range extending from the intertidal zone down to approximately 10 meters. This distribution makes Dermatobranchus pustulosus a common sight in the neritic zone, the marine environment that lies over the continental shelf.

Taxonomy

Dermatobranchus pustulosus is a member of the Gastropoda class, belonging to the Nudibranchia order, and the Arminidae family. This classification places it within the diverse and fascinating group of marine snails, characterized by their lack of shells and often striking appearances.

Feeding

Dermatobranchus pustulosus is a specialist feeder, known to prey on specific types of coral polyps. This corallivorous diet makes it an important part of the coral reef ecosystem. The nudibranch uses its radula (a chitinous ribbon with teeth) to scrape and consume the polyps, extracting nutrients and energy from their tissues. By preying on coral polyps, Dermatobranchus pustulosus plays a role in regulating the population dynamics of these important reef-building organisms.