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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 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.
In the case of the diamondback tritonia, these nudibranchs are typically light pink, orange or white in color [7] and have an intricate pattern along their back. This pattern can vary amongst individuals. [8] They also possess a vestigial girdle of chitinous ridges that separates them from other nudibranch species. [9]
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 .
Janolus fuscus, head end towards the top. The bodies of nudibranchs in this species are semi-translucent and whitish-grey, and reach lengths of about 35mm. The body is covered in short cerata with brown cores, and the exterior fades to orange and then white at the tip.
Although some references [3] [4] state that Berghia coerulescens and other members of Berghia will feed on Aiptasia sp. (sea anemones that are usually considered pests in the marine aquarium hobby), the species most mentioned in Internet forums and articles for the control of Aiptasia anemones is now known to be Berghia stephanieae.
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 .
Berghia is a genus of sea slugs, aeolid nudibranchs. They are shell-less marine gastropod molluscs in the family Aeolidiidae. [2] They are covered in cerata which give them their unique tentacle look and color. Berghia are commonly found in shallow waters and their diet consists of strictly Aiptasia Anemone. This genus is now commonly used ...