Ectoparasit in, at least, the circalittoral.
Original taxon: Parthenia ventricosa.
Synonyms: gracilis, turritellata…
The species is larger than many other european members of the genus. Protoconch of type A, rather small; whorls less flat than in acicula; growth lines slightly prosocline. The shape varies a little, with whorls more or less convex, but never flat.
Large dead adult specimen from 160m deep, detritic bottom,
off Ras ir-Raħeb, NW. Malta. 2,7mm.