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Bathydevius (Greek for "deep-living deviation") is a monotypic genus of unusual, highly distinctive nudibranch native to deep waters of the North Pacific Ocean.It contains a single species, B. caudactylus ("finger tail"), and is the only known member of the monotypic family Bathydeviidae.
This species has a maximum size of 70 mm. [2] The background color is deep black. The margin of the parapods and body are marked with a thin electric blue line. The two rather long "tails" at the end of the animal are characteristic of the genus Chelidonura, the left one is always longer.
The greatest diversity of nudibranchs is seen in warm, shallow reefs, although one nudibranch species was discovered at a depth near 2,500 m (8,200 ft). [10] This nudibranch, described in 2024 as Bathydevius, is the only known nudibranch with a bathypelagic lifestyle and is one of the very few to be bioluminescent. [11] [12]
Bertsch and Gosliner (1989) [2] erected the name Hypselodoris andersoni for the locust nudibranch, unaware of Bergh's earlier name. However, Rudman (2000) recognized that C. peasei matched the description of H. andersoni and Epstein et al., (2018) formalized the priority of Hypselodoris peasei over H. andersoni .
This polycerid nudibranch is translucent orange in colour with black tips to the rhinophores and gills. The rhinophore sheaths are edged with black with a patch of blue at the widest part. This blue colour is also present at the tip of the tail and at the tip of the lateral papillae beside the gills, separated from the orange of the body by a ...
Godiva quadricolor is a slender pale-bodied nudibranch with many cerata striped in bands of blue, yellow and orange. Its head is orange with rugose orange rhinophores and has a pair of orange oral tentacles with a white central stripe.
Notobryon wardi is a medium-sized (up to 50 mm) smooth-bodied nudibranch. The body is reddish-brown with iridescent blue-green spots on its sides and back. The smooth rhinophores are surrounded by cup-like sheaths. Two sets of wispy gills are flanked by flattened lobes extending from the body. [4]
Tambja morosa, also known as Tambja kushimotoensis or gloomy nudibranch, [3] is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the subfamily Nembrothinae [4] within the family Polyceridae.