Tag Archives: Triodopsis

Triodopsis vulgata

Dished Threetooth

Triodopsis vulgata

Triodopsis vulgata, Big Otter Creek, Bayham, Elgin Co., Ontario (Forsyth collection, 07.190.596; width, 14.5 mm).

This is one of two species of Triodopsis (family Polygyridae) in Canada. Triodopsis vulgata is restricted in Canada to Southwestern Ontario, where it is known from Pelee, Middle and Middle Sister islands, Essex County, and on the mainland in south and west of Wellington County. This somewhat worn shell was retrieved from stream drift but in Canada the species is known from often dry, open or sandy woods with Hackberry or Sugar Maple.