3-6mm in diameter, 1-1.5mm thick. Rounded whorls with deep sutures and without a keel. The aperture (mouth) is very rounded but offset from the previous whorl. Despite the name, it usually has radial striae but lacks the spiral striae seen in Gyraulus albus.

Gyraulus albus is a similar size and shape but has microscopic spiral striae. It also flatter with the aperture more in line with the previous whorl (though not completely).

Unless identified by a recognised expert, photographic evidence is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used. Note the shell's size and describe the identifying characters. It is advisable to retain the specimen in case further checks are needed.

Lakes, ponds, reservoirs - rarely flowing water. It favours clean and well-vegetated water bodies.

All year.

Uncommon but widespread.

Uncommon, though possibly under-recorded.