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Psychropotes longicauda
''Psychropotes longicauda'' is a species of sea cucumber in the family Psychropotidae. It inhabits the deep sea where the adult is found on the seabed. The larva is pelagic and has an appendage shaped like a sail on its back which may enable it to move through the water.〔Knowlton, N. 2010. ''Citizens of the Sea: wondrous creatures from the Census for Marine Life'' ISBN 978-1-4262-0643-6〕
==Description==
As an adult, ''Psychropotes longicauda'' has eighteen short feeding tentacles, each with a leathery terminal disc with retractile processes projecting around the margin. Its body is very flexible and can grow to a length of between . It is approximately cylindrical but broadest and somewhat flattened near the anterior end. At the posterior end there is a dorsal, tail-like appendage up to long, either pointed or with a pair of unequal-length tips. There is a double row of small tube feet along the ventral surface and a single row of larger tube feet on each side of the body. The skin is soft and pliable and the colour is violet in preserved specimens.
The larva has ten tentacles and is transparent with a reddish hue at the anterior end. It has an unpaired gelatinous dorsal appendage. Larvae can grow to at least in length excluding the appendage which may be nearly as long as the body.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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