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Bathydevius is a bizarre nudibranch with a highly unusual appearance, ecology, and taxonomy. It is the first known nudibranch to inhabit the bathypelagic zone, and only one of very few pelagic, free-swimming genera within this generally benthic group.
Of the approximately 3000 species of nudibranch, the vast majority are benthic, only a couple are neustonic, and Cephalopyge trematoides is very unusual in that it is pelagic. [6] [7] It is estimated to be one of only five planktonic nudibranch species (another epipelagic example is Phylliroe bucephala). [8] Further information (including photos):
Phylliroe is a genus of average sized (up to 5.5 centimetres or 2.2 inches), highly transparent pelagic nudibranchs, marine gastropod molluscs in the order Opisthobranchia, that consists of two known species. [2] It is notable for being an open-ocean hunter that resembles a fish in body plan and locomotion, an example of convergent evolution. [2]
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 .
The Phylliroidae are a family of nudibranch sea snails, highly adapted to a pelagic lifestyle and occurring in tropical surface waters around the globe. The two species of the genus Phylliroe and Cephalopyge trematoides that have been assigned to this family are small to average in size (up to 5.5 centimetres or 2.2 inches), slender and highly transparent.
Dendronotus iris, also known as the rainbow nudibranch, is a species of sea slug, a dendronotid nudibranch, a shell-less marine gastropod mollusc in the family Dendronotidae. [ 2 ] [ 3 ] Distribution
The rhinophores of the frilled nudibranch. The frilled nudibranch is a large (up to 90 mm) smooth-bodied nudibranch with a frilled appearance. Margins of the body have a bright bluish edge, and the body may have pink or brown pigmentation. The rhinophores are elongated and smooth, and emerge from a scrolled sheath. [4]
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