Tiger Butterfly Sea Slug

Cyerce nigra

Cyerce nigra is a distinctive sea slug characterized by its unique shape and coloration. It features a flattened body adorned with bold patterns that can help divers identify it among similar species. This species is typically found in tropical waters, particularly in the Central Pacific region, including the Philippines and French Polynesia. It inhabits benthic environments, often residing on coral reefs and rocky substrates at depths generally shallower than 40 meters, with many occurrences noted at depths around 20 meters or less. The diet of Cyerce nigra primarily consists of algae, which it grazes from the surfaces of its habitat. This herbivorous diet is typical for many sea slugs, allowing them to thrive in their ecological niche. Breeding behaviors and reproductive strategies for this species are not well-documented, but like many gastropods, they likely engage in some form of external fertilization, laying eggs in clusters on suitable substrates. Encountering a Tiger Butterfly Sea Slug while diving can be an intriguing experience. Divers may observe it slowly grazing on algae, often blending in with the surrounding environment due to its coloration. Conservation status for Cyerce nigra remains unassessed by the IUCN, meaning that its population trends and potential threats are not currently evaluated.