Habitat: it can be found in remarkable depths (300-400 m) into muddy-detrital sediments, but even in the infra-circalittoral zones (=M. costata, a low depth form).
Distribution: it can be found in a large part of the Mediterranean, but never common.
Notes: there are different opinions concerning this species synonymy with M. costata (Donovan, 1804, non Pennant. 1777). Recently CLEMAM granted Giribet & Penas' opinion who. examining hundreds specimens of the two forms, consider these two ones as eco-types of different bathymetry of a taxon only. This species is slim in form, with very narrow and sinuous axial ribs (7-8), with very wide interspaces. Sculpture made by numerous spiral lines incised. Whorls not much convex, suture broad and lip thickened. Low depth form has one large band either brown in colour or chestnut-coloured, while deep water form is uniform light hazel-brown in colour. Protoconch, made by three whorls the last one of which with one clear axial rib oblique, is vitreous and dirty white in colour. Juvenile specimens have not whorls more convex than the adult ones, differently from M. attenuata. The differences between these two similar species are stated in this last species description. The adult specimens average measures are around 8-9 mm in height.