Common name: willey's halgerda

General information

Halgerda willeyi is a striking species of sea slug, specifically a dorid nudibranch, known for its intricate pattern and vibrant coloration. This species is a favorite among nudibranch enthusiasts and is often sought after for its unique appearance, which includes a white body with orange to yellow ridges and black lines.

Care

In the home aquarium, Halgerda willeyi requires a well-established system with plenty of live rock and a stable environment. They are sensitive to water quality and require pristine conditions with low nitrate levels. They feed on sponges, so it's essential to ensure that their dietary needs are met, which can be challenging in captivity.

Reproduction

Like many nudibranchs, Halgerda willeyi is a hermaphrodite, possessing both male and female reproductive organs. They can lay spiral ribbons of eggs, which hatch into free-swimming larvae. These larvae will eventually settle and metamorphose into the adult form.

Symbiosis

While not known for any specific symbiotic relationships, nudibranchs like Halgerda willeyi play a role in the reef ecosystem by controlling sponge populations, which can otherwise overgrow and smother corals.

Habitat

Halgerda willeyi is found in the tropical Indo-Pacific region, typically on coral reefs or rocky substrates where sponges are abundant. They are usually observed at depths ranging from the intertidal zone down to about 30 meters.