Atelecyclus undecimdentatus is a species of crab in the family Atelecyclidae.

[1][2][3] The body of this crab is quite hairy, and has a whitish to cream colour, with purple marks on the carapace.

However, Atelecyclus rotundatus can be distinguished by its finer granulations and narrower carapace.

[5] This species is found in the coastal Atlantic Ocean, the English Channel, and also rarely occurs in the Mediterranean Sea.

[4] Atelecyclus undecimdentatus normally lives in waters around 30 metres deep on bottoms ranging from gravel to sandy mud, sometimes under rocks.