†family Sphenotretidae Savage 1996 (lamp shell)

Rhynchonellata - Rhynchonellida - Sphenotretidae

Parent taxon: Ancistrorhynchoidea according to A. Williams et al. 2002

Sister taxa: Ancistrorhynchidae, Niorhynicidae, Oligorhynchiidae

Subtaxa: Altaethyrella Dorytreta Sphenotreta

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Type: Sphenotreta

Ecology: stationary epifaunal suspension feeder


• Ordovician of Canada (4: Quebec collections), China (25), Kazakhstan (8), Norway (1), the Russian Federation (2), the United Kingdom (1), United States (13: Nevada, Tennessee, Virginia)

• Chazy of Canada (2: Ontario, Quebec), United States (25: New York, Vermont)

• Whiterockian of United States (1: Nevada)

Total: 82 collections including 83 occurrences

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