Nudibranch spp.
Chromodoris / Hypselodoris spp.
Sighting evidence at Hilutungan Channel, Mactan Island
Hilutungan Channel hosts a diverse nudibranch assemblage — Chromodoris, Hypselodoris, and Phyllidiella species are found on virtually every dive, with electric-blue, orange, and spotted specimens visible on coral rubble and sponge surfaces from 8 m down. Nudibranchs are key indicator species for reef health and chemical diversity — their bright aposematic colours advertise toxins sequestered from sponge prey. The channel's sanctuary-protected rubble zones and sponge gardens support one of the highest nudibranch species densities on Mactan Island.
Evidence at this site
No confirmed records on file at this site
Nudibranch spp. is listed as a curated species here based on historical reports.