Ischyrotoma Raymond 1925 (trilobite)

Trilobita - Proetida - Dimeropygidae

Parent taxon: Dimeropygidae according to R. A. Fortey and D. L. Bruton 2013

See also Fortey and Droser 1999, Jell and Adrain 2002 and Sepkoski 2002

Sister taxa: Bearriverops, Chomatopyge, Dimeropyge, Dimeropygiella, Heckethornia, Ischyrophyma, Mesotaphraspidinae, Mesotaphraspis, Pseudohystricurus, Toernquistia, Tulepyge

Subtaxa: Ischyrotoma anataphra Ischyrotoma borealis Ischyrotoma juabensis Ischyrotoma parallela Ischyrotoma sila Ischyrotoma stubblefieldi Ischyrotoma twenhofeli Ischyrotoma wahwahensis

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Type: Ischyrotoma twenhofeli

Ecology: fast-moving low-level epifaunal deposit feeder

Distribution:

• Ordovician of Canada (14: Alberta, Newfoundland, Newfoundland and Labrador, Nunavut collections), China (1), Norway (4), United States (17: California, Nevada, Utah)

• Whiterockian of Canada (1: Newfoundland and Labrador), Norway (1), United States (5: Nevada, Utah)

• Cassinian of Canada (13: Newfoundland, Newfoundland and Labrador, Quebec), the United Kingdom (1), United States (7: Oklahoma)

• Arenig of United States (1: New York)

• Arenigian of Canada (1: Northwest Territories)

• Jeffersonian of Canada (3: Newfoundland, Newfoundland and Labrador), United States (22: Oklahoma)

Total: 91 collections including 99 occurrences

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Specimen images are retrieved through the ePANDDA API.


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