Contact Blog Project Noah Facebook Project Noah Twitter

A global citizen science platform
to discover, share and identify wildlife

Join Project Noah!

Common Woodlouse / Kopneni račić

Oniscus asellus L.


Oniscus asellus is one of the largest native woodlice in Britain, at up to 16 mm long. It is relatively flat, and is a shiny grey in color, although juveniles are rougher. Pale patches are often visible on the back of Oniscus asellus; these are areas that store calcium, which is then used to reinforce the exoskeleton after a moult. Moulting occurs in two halves, with the rear half molting before the front half. The exuvia is often consumed by the animal after molting.


It is not known from the Mediterranean Basin, but is widespread in Northern and Western Europe, as far east as the Ukraine, as well as in the Azores and Madeira; it has also been widely introduced in the Americas. Oniscus asellus occurs in a wide range of habitats, including some with little available calcium. It is chiefly found under stones, and on rotting wood. It is the only woodlouse regularly found on heather moors and blanket bogs, where it lives around items such as rotting fenceposts.

Species ID Suggestions

Sign in to suggest organism ID


injica 7 years ago

Hvala, da, malo sam ga škakljala pa se prevrnuo :D

Jopy 7 years ago

odlično! :D super su ti ove fotke, dobro je pa se okrenuo na leđa da mu vidim nogice, odmah sam ga prepoznala :D

injica 7 years ago

Je je :)

Jopy 7 years ago

ovo bi mogao biti kopneni račić (Isopoda), evo ti link pa vidi:

Spotted by

Zagreb, Croatia

Spotted on Apr 12, 2013
Submitted on Apr 12, 2013

Spotted for Mission

Related Spottings

Oniscus asellus Oniscus asellus Oniscus asellus Common Woodlouse

Nearby Spottings

Blunt-tailed Snake Millipede Spotting Common Glow-worm Larva / Larva krijesnice Cockroach nymph ?