C. cylindracea has an elongated, smooth, rounded shape, up to about 14 mm. The peduncle of the uropods is extended, equalling the length of the triangular pleotelson (which is finely serrated and setose). It has small eyes and short antennae, and is typically mottled with orange on a white background.
Distribution and Habitat
This species is a sublittoral scavenger which lives in shell gravel. It is commonly found on the bait in crab and lobster pots.
Naylor, E. & A. Brandt. 2015. Intertidal Marine Isopods. Synopses of the British Fauna (New Series), No. 3. Field Studies Council, for The Linnean Society of London.