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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.
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.
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 .
Felimare californiensis, common name the California blue dorid, is a species of colourful sea slug or dorid nudibranch, a marine gastropod mollusk in the family Chromodorididae that eats dysideid sponges.
Pteraeolidia ianthina is a sea slug, an aeolid nudibranch in the family Facelinidae. [ 2 ] [ 3 ] It is known as a blue dragon , [ 4 ] a name it shares with Glaucus atlanticus and Glaucus marginatus .
This nudibranch grows to about 13 cm (5.1 in) long and feeds on sponges of the genus Dysidea. They are typically large animals, often reaching 50–80 mm. The background colour is dark blue, almost black in some Atlantic specimens, while in the Mediterranean the oldest specimens are usually discoloured, becoming pale blue, somewhat violet. [4]
This is a large species growing to at least 115 mm. It can be distinguished by its numerous (3 to 6), longitudinal, tuberculate notal ridges. The ridge and bases of the tubercles are a blue-grey colour. The tubercles are capped in yellow. The foot sole has a black longitudinal foot stripe. The rhinophoral clavus possesses 27 to 30 lamellae. [4]