†family Polyplacognathidae Bergström 1981 (conodont)

Conodonta - Prioniodontida - Polyplacognathidae

Parent taxon: Prioniodontacea according to A. Mestre and S. Heredia 2013

See also Clark et al. 1981, Stouge and Bagnoli 1999, Sweet 1988 and Zhen et al. 2011

Sister taxa: Icriodontidae, Oepikodontidae, Phragmodontidae

Subtaxa: Baltoplacognathus Cahabagnathus Eoplacognathus Polonodus Polyplacognathus Yangtzeplacognathus

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Ecology: nektonic carnivore

Distribution:

• Aluoja of Sweden (8 collections)

• Chazyan of United States (1: Tennessee)

• Whiterockian of United States (5: Nevada)

• Arenig of Argentina (2)

• Ordovician of Argentina (16), Canada (5: British Columbia, Newfoundland, Northwest Territories), China (7), Estonia (2), Kazakhstan (3), Lithuania (1), the Russian Federation (12), Sweden (3), United States (13: Iowa, Minnesota, Missouri, New York, Oklahoma)

Total: 78 collections including 92 occurrences

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