Rossia macrosoma

(delle Chiaje, 1829)

Body is firm with smooth skin, dorsal surface more densely and finely pigmented than ventral surface. Maximum mantle length 60 mm, comprising about one-third total length of animal. Dorsal anterior edge of mantle is not fused to head, with well-marked lip continuous with rest of mantle opening.
Fins are short and rounded, rather fleshy; anterior edge of fins is not reaching anterior edge of mantle.
Length of arms is about twice the length of head. Arms are more or less rounded in section; each with two rows of suckers proximally, four or more rows distally.
Club suckers are small, similar, arranged in approximately ten rows.

Shallow sublittoral and offshore.

From western Norway and the Faeroe Islands to the Mediterranean and Adriatic Seas and north-western Africa. Also recorded in the Greenland Sea off the coasts of Greenland and Iceland. Not in the southern North Sea (Distr. R. macrosoma).