Ecrobia ventrosa
Ecrobia ventrosa, common name spire snail, is a European species of small brackish water snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae. Distribution. This species occurs on the coasts of: The distribution type is coastal Mediterranean–Atlantic. Description. For terms see gastropod shell The 3–4 x 1.5–2 mm. shell has 5–7 convex whorls which are slightly more convex than those of "Hydrobia acuta neglecta". Smaller shells with 5 whorls are slightly less slender than those of Hydrobia neglecta. The suture is deep. The aperture is rounded upside (or only slightly pointed ) and attached to the last whorl. The lip is weakly developed. The shell is very finely striated and in colour translucent, glossy yellow-brown, usually hidden by a matt deposit. Certain identification requires dissection. The penis has a pointed tip, not a blunt tip as in "Hydrobia acuta neglecta".