• Norwegian: -


The translucent, sometimes speckled, white body may reach a length of 3 cm. There may be three longitudinal, orange lines running along the body. The rhinophores, gills and papillae are orange or white tipped.


It is usually found on rocky substrate from the tidal zone and down to 30 meters. It is reported to feed on ascidians, but Bernhard Picton suggests that they feed on Entoprocta, small animals living on bryozoans.


This nudibranch is widespread across the North Atlantic, including the White Sea, Greenland, Iceland, the British Isles and Europe, as far South as the Mediterranean. There are some uncertainties regarding the similar A. pacifica. If this is the same species, it is also found on the west coast of North America.