Tiny risso snail (Rissoa parva)
|Researched by||Ken Neal||Refereed by||Admin|
|Authority||(da Costa, 1778)|
|Other common names||-||Synonyms||Pusillinia parva , Turboella parva (da Costa, 1778)|
Rissoa parva is a small snail up to 5 mm high and 3 mm wide. There are 7-8 whorls, which have a convex profile. It occurs in two forms, one with smooth whorls (var. interrupta) and one with vertical ridges (costae) on and after the 5th whorl. The shell is cream coloured to pale brown and has a lilac tint around the aperture. The body of the snail is yellow with black streaks and has long slender tentacles with an eye at the base of each.
Recorded distribution in Britain and IrelandCommon on all coasts of Britain and Ireland.
HabitatOn rock from mean tide level to 15 m depth but most common around mean low water springs. Also found on algae, in kelp holdfasts and under rocks.
- Small snail up to 5 mm high.
- Shell with raised spire of several whorls.
- Aperture not wider than widest part of the shell.
- Shell dextral.
- Largest whorl makes up less than three quarters of the shell height.
- Shell without ornament apart from growth lines.
- Whorls of shell have a slightly concave, swollen appearance and bear vertical ridges, known as costae.
- Dark comma shaped mark on the last whorl adjacent to the lip of the aperture.
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Last Updated: 19/08/2004