Dende as Illas Británicas ata Canarias, e Mediterráneo
Snout long, bifid; cephalic tentacles long, slender with eyes on prominent bulge at base. Mantle edge broadly lobed; foot long, narrow, with doubled-edged anterior margin; large opercular lobe projects posteriorly from below oval operculum.
On soft substrata, associated with Zostera and other weeds; from LWST to 250 m.
Locally abundant. Widely distributed from Canaries to Lofoten Isles; absent from continental shores of the southern North Sea and east Channel (Distr. B. reticulatum