Ianiropsis breviremis (G. O. Sars, 1883)


Janira breviremis G. O. Sars, 1883, Janiropsis breviremis Sars, 1899

ID Difficulty



Similar in appearance to Janira maculosa, this species is somewhat more elongate and has relatively shorter antennae and uropods. It also has a smoother outline, and the male preoperculum is distinctive. Males grow to 6 mm, females to 4 mm.

J. breviremis has similar habitat preferences to Janira maculosa, being found in and among sponges, bryozoans, Laminaria holdfasts, etc. It is mostly a sublittoral species, but occasionally turns up intertidally (e.g. it has been recorded amongst Halidrys seaweed at Cullercoats in north-east England; see Foster-Smith 2000).


Foster-Smith, J. 2000. The Marine Fauna and Flora of the Cullercoats District: Marine Species Records for the North East Coast of England (Volume 1). Sunderland: Penshaw Press.

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.

BRC code