Family Hemithirididae Rzhonsnitskaya 1956

Rhynchonellata - Rhynchonellida - Hemithirididae

Alternative spelling: Hemithyridae

Synonym: Hemithyrididae Rzhosnitskaya 1956 [replaced name]

Parent taxon: Hemithiridoidea according to C. C. Emig et al. 2013

See also Chiesa et al. 1995, Cooper 1959, Craig 2000 and Williams et al. 2002

Sister taxa: Cyclothyrididae, Notosariidae, Septirhynchiidae, Tetrarhynchiidae

Subtaxa: Hemithiris Paraplicirhynchia Patagorhynchia

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Distribution:

• Quaternary of Canada (2: Newfoundland and Labrador, Quebec collections), Greenland (5), Japan (7), United States (3: Alaska, Oregon)

• Pliocene to Pleistocene of Japan (1)

• Pliocene of Japan (1)

• Miocene of Argentina (2), Chile (1), Japan (4)

• Oligocene of United States (5: Washington)

• Eocene of Antarctica (2), United States (4: Washington)

• Paleogene of Antarctica (2)

Total: 39 collections including 45 occurrences

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