Cabangus regius

Cabangus regius is a small dendronotid nudibranch that can grow up to 30 mm in length. This species features a translucent white body, often tinged with milky white to pink. Its dorsal appendages and rhinophore sheath processes are dark brown, and the body is adorned with rounded spots of the same color. The rhinophore clubs are bright orange, and some specimens may exhibit extensive orange pigmentation. It can be distinguished from similar species by its lack of raised, pointed tubercles on the body. Originally described from Bunaken Island in the Celebes Sea, this species has a distribution that includes the Philippines, various locations in Indonesia, and Sabah in Malaysia. It is typically found in shallow waters, with 86% of recorded occurrences at depths shallower than 40 meters and 90% below 50 meters. This nudibranch inhabits coral reefs and other related marine environments. As a sea slug, Cabangus regius feeds on small invertebrates, although specific dietary preferences are not detailed in the sources. Breeding behaviors are not explicitly mentioned, but nudibranchs are generally known for their hermaphroditic reproduction. Encounters with this species during dives may be intriguing due to its distinctive coloration and form, though it is not noted for any particular behaviors that would attract divers. The conservation status of Cabangus regius is not evaluated in the sources, indicating a lack of specific information regarding its population trends and threats.