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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.
Like almost all heterobranchs, blue dragons are hermaphrodites and their male reproductive organs have evolved to be especially large and hooked to avoid their partner's venomous cerata. [8] Unlike most nudibranchs, which mate with their right sides facing, sea swallows mate with ventral sides facing. [25]
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 .
Glaucus is a genus of small blue pelagic sea slugs.They are aeolid nudibranchs, [1] ranging in size from 20 to 40 mm (0.79 to 1.57 in). [2] They feed on colonial cnidarians such as Portuguese man o' wars, blue buttons, and purple sails.
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.
Glaucus marginatus is a species of small, floating, blue sea slug; a pelagic (open-ocean) aeolid nudibranch; a marine opisthobranch gastropod mollusc in the family Glaucidae. [ 1 ] [ 2 ] This species is closely related to Glaucus atlanticus , and is part of a species complex (Informal clade Marginatus) along with Glaucus bennettae , Glaucus ...
Pteraeolidia ianthina, one of the most common aeolids found, is often called a "blue dragon" by Eastern Australian divers because of its close resemblance to a Chinese dragon. [8] It is one of the most common aeolid nudibranchs found in Eastern Australia and can inflict a painful sting to humans.
This animal can reach a total length of more than 120 mm. It is a large dark-bodied nudibranch which may have green stripes running down the length of the body or have green raised spots. The margin of the foot and head is a vivid red-orange. The rhinophores and gills may be red or green.