Hypselodoris katherinae

Hypselodoris katherinae is a small nudibranch that can reach a total length of 32 mm. It features a translucent pale pink mantle adorned with longitudinal red-brown lines that may be segmented and branch out. The mantle margin is decorated with small blue-purple spots that can merge into a continuous line. Its gills are white with orange lines, while the rhinophores exhibit a red to orange coloration. This species has often been confused with Hypselodoris carnea, making careful observation important for identification. This nudibranch is found in tropical regions of the Western Pacific, specifically in areas such as Hong Kong, the Philippines, Malaysia, and Indonesia. It typically inhabits benthic environments and is recorded at depths shallower than 40 meters, with most occurrences below 30 meters. The species was first described from Pulau Chebeh, located off the northwest tip of Tioman Island in eastern Malaysia. Hypselodoris katherinae feeds on small invertebrates, which it grazes on in its habitat. The reproductive habits of this species are not detailed in the sources, but nudibranchs generally exhibit hermaphroditic behavior, allowing them to mate with any other individual they encounter. Divers may encounter this species at various dive sites, where its distinctive coloration and patterns can be appreciated against the backdrop of coral reefs and rocky substrates. The conservation status of Hypselodoris katherinae has not been evaluated by the IUCN, indicating a lack of comprehensive data on its population dynamics and threats. However, it is not known to pose any danger to humans and is generally regarded as harmless.