Diagnosis
Aegopinella nitidula differs from species of Oxychilus by the presence of microscopic spiral striae. Also, there is a somewhat more opaque, whitish area around the slightly larger umbilicus.
Shell
Small (maximum width, 8-10 mm), disc-shaped, dull brownish with the area around the umbilicus more opaque and whitish; growth lines and close, microscropic spiral lines.
Animal
Body dark grey, slightly bluish dorsally, paler on the sides, and with a pale sole. No garlic-like odour when irritated.