Tag Archives: Polygyridae

All you ever wanted to know about Patera appressa

Well almost …

Last month, Mike Oldham, Fred Schueler, and I published our paper on Patera appressa in Ontario. This species had been on our radar for some time. Fred discovered it for the first time in Ontario (and Canada) in the spring of 1994. Since that time, all of us have gone back to sites; I was there last September (2014).

Patera appressa

Patera appressa from along the Trent River, Trenton, City of Quinte West, Hastings County, Ontario, Canada; NBM 009026; maximum diameter (width), 14.3 mm.

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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.