The families of British non-marine molluscs (slugs, snails and mussels)


L. Watson and M. J. Dallwitz


Morphology. Snails, with a conspicuous, spiral, univalve shell.

The animal with two pairs of tentacles. Eyes at the tips of the posterior tentacles.

The shell inoperculate; rising-spiral; 8.5–10 whorled; typically dextral; higher than wide; 6–8.5(–11) mm high; 2.3–2.8 mm wide; height about 2.76 x the width; high-spired and tapered gradually from the body whorl. The height of the spire about 0.64 x that of the shell. The spire fairly acute. The shell fusiform, or tear-shaped; rather shallowly sutured. The body whorl moderately convex. The whorls of the spire feebly convex to moderately convex. The whorls neither shouldered nor keeled. The shell conspicuously and regularly striated across the whorls (with very regular, fine ribbing). The aperture bearing teeth (usually with about 9 teeth). The shell without an umbilicus (?). The shell fairly thick-lipped (and deflected); opaque; brown; plain.

General biology, ecology. Terrestrial. In dry, stony situations, mainly on chalk or limestone.


Classification. Gastropoda; Pulmonata.

British representation. Abida (1).

Illustrations. • Abida secale, with Clausiliidae, Cochlicopidae, Enidae, Ferussaciidae and Pupillidae (Ellis). • Abida secale, with Enidae, Pupillidae and Vertiginidae (Adams).

To view the illustrations with detailed captions, go to the interactive key. This also offers full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa.

Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2005 onwards. The families of British non-marine molluscs (slugs, snails and mussels). Version: 4th January 2012.’.