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Characteristics, distribution and ecology
Taxonomische classification
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Heller, 1868

Description
Body fusiform, attenuating at the ends, but the posterior end is not drawn into a long, tail-like prolongation; up to 150 mm in length; coloured pinkish.

Tentacles
There are 10, tree-shaped tentacles.

Tube-feet
Numerous small tube-feet are scattered over the body.

Skin
The skin is thin and transparent, with calcareous deposits only at the posterior end of the animal. These deposits consist of small, more or less regular disks, with a spire composed of 2 rods.

Habitat
This species has been recorded from depths of 30-180 m.

Distribution
In the North Sea, this species is only known from the Shetland Islands. It is likely that this species is also generally distributed on the western British coasts. Elsewhere it is found southwards down to the Azores and the Mediterranean.

Remarks
Several Thyone species are very similar in shape and some species names could turned out to be synonyms.

Thyone inermis