Common name: black gilled phestilla

General information

The Melanobrachia Nudibranch, scientifically known as Phestilla melanobrachia, is a striking species of sea slug within the nudibranch family. These creatures are known for their distinctive coloration and patterns, which can make them a visually appealing addition to a reef aquarium. However, they are not commonly kept in home aquariums due to their specialized dietary requirements.

Care

Caring for Phestilla melanobrachia in a home aquarium is challenging due to their specific feeding habits. They feed exclusively on certain species of corals, particularly those belonging to the genus Porites. This obligate coralivorous behavior means that unless a hobbyist can provide a steady supply of these corals, the nudibranchs may starve. Therefore, they are typically not recommended for most hobbyists, especially those with mixed reef tanks that contain a variety of coral species.

Reproduction

Like many nudibranchs, Phestilla melanobrachia is a hermaphrodite, possessing both male and female reproductive organs. They can engage in reciprocal mating, where both individuals exchange sperm to fertilize their eggs. The eggs are laid in gelatinous spirals or ribbons and are often deposited on the coral they feed upon.

Symbiosis

While not a form of symbiosis that benefits the aquarium inhabitants, Phestilla melanobrachia has a parasitic relationship with its coral prey. It feeds on the tissues of Porites corals, which can lead to significant damage or even the death of the coral if the nudibranch population is not controlled.

Habitat

Phestilla melanobrachia is found in the Indo-Pacific region, typically in shallow reef environments where their preferred Porites coral prey is abundant. They are adapted to life on the reef and require similar conditions in captivity, including clean, well-circulated water and appropriate lighting to maintain the health of their coral food source.