Nudibranch – Hypselodoris melanesica

Hypselodoris melanesica, commonly known as the “Hypselodoris melanesica”, is a captivating species of sea slug belonging to the family Chromodorididae. These vibrantly colored nudibranchs are a fascinating example of the diversity found in the ocean’s depths.

Description & Characteristics

Hypselodoris melanesica is characterized by its striking appearance. The body is typically elongated and oval-shaped, with a smooth, almost velvety texture. The dorsal surface, or back, is a brilliant blend of bright orange, yellow, and black. A distinctive black line runs along the mantle, dividing the bright orange portion from the more yellowish area. This pattern, combined with its relatively large size, makes it a standout in the marine environment.

Habitat and Occurrence

Hypselodoris melanesica thrives in a variety of marine zones, ranging from the lower limit of the intertidal zone to the shelf edge at about 200 meters depth. This broad range allows it to inhabit subtidal, sublittoral, infralittoral, and deep zones, making it a common sight in neritic environments. They can be found on rocky reefs, coral formations, and even in sandy areas, demonstrating their adaptability to diverse marine landscapes.

Taxonomy

Hypselodoris melanesica belongs to the Class Gastropoda, which encompasses a vast array of mollusks. It is further classified within the Order Nudibranchia, a group of marine gastropods known for their striking coloration and lack of a protective shell. The specific family, Chromodorididae, is characterized by members that possess brightly colored bodies and often have a distinctive “mantle” that extends over their gills.

Feeding

Hypselodoris melanesica is a specialized feeder, relying on sponges for sustenance. This dietary preference is reflected in the nudibranch’s ability to extract and utilize the sponges’ defensive chemicals for its own protection. This strategy allows Hypselodoris melanesica to avoid predation by deterring potential attackers with the unpleasant or toxic substances it acquires from its sponge diet.