Galápagos Blue Beauty

Tambja mullineri

Tambja mullineri is a small nudibranch that can grow to a maximum length of about 20 millimetres. It features light blue longitudinal stripes on a blue background, with five dark blue gill lamellae that have light blue outer faces. This coloration can help divers identify it among other similar species in the region. The species is endemic to the Galapagos Islands, where it inhabits rocky areas on wall faces, making it a common sight for divers exploring these underwater landscapes. This nudibranch is a simultaneous hermaphrodite, meaning it possesses both male and female reproductive organs. During mating, individuals will engage in a unique behavior where they attempt to penetrate each other's body wall, with the dominant individual acting as the male. After mating, eggs are deposited on a suitable substrate, where they develop into planktonic larvae before maturing into adults. Encounters with the Galápagos Blue Beauty can be rewarding for divers, as they may spot these creatures clinging to the rocky surfaces. Their colors and patterns make them a captivating subject for underwater photography. While the conservation status of this species has not been evaluated, it is important for divers to observe and appreciate these creatures without disturbing their natural habitat.