Triopha catalinae is a species of sea slug, specifically a nudibranch, belonging to the family Polyceridae. These colorful marine creatures are commonly known as Catalina triophas, and are predominantly found along the Pacific Coast of North America, from Alaska to central California.
Triopha catalinae is characterized by its distinct physical traits. It has a soft, elongated body reaching a length of up to 6 centimeters, with a tapered anterior portion and a broader posterior end. The coloration of its mantle is highly variable, but typically encompasses shades of orange, red, or yellow, often with striking patterns or markings. The body is adorned with numerous finger-like structures called cerata, which serve as respiratory organs. These cerata are usually colorful and can feature bands or spots, enhancing the overall vibrant appearance of the species.
Like other nudibranchs, Catalina triophas are marine carnivores, primarily feeding on bryozoans. They are often observed grazing on these colonial organisms, slowly moving along the surfaces of rocks or other substrates. Triopha catalinae employs chemical defenses to deter potential predators by secreting toxic compounds derived from the bryozoans they consume.
Due to their abundance and striking appearance, Triopha catalinae is favored among underwater photographers and divers. The species also serves as an important component of marine ecosystems, contributing to the natural balance and biodiversity of its habitat.
