Ptychagnostus Jaekel 1909 (artiopod)

Artiopoda - Agnostida - Ptychagnostidae

Alternative spelling: Agnostus (Ptychagnostus)

Synonyms: Aristarius Öpik 1979, Canotagnostus Rusconi 1951, Triplagnostus (Aristarius) Öpik 1979, Zeteagnostus Opik 1979

Parent taxon: Ptychagnostidae according to H. B. Whittington et al. 1997

See also Ergaliev and Ergaliev 2008, Jell and Adrain 2002, Kobayashi 1935, Öpik 1979, Palmer 1954, Sepkoski 2002 and Westrop et al. 1996

Sister taxa: Acidusus, Allobodochus, Aotagnostus, Goniagnostus, Lejopyge, Myrmecomimus, Onymagnostus, Pseudophalacroma, Tomagnostus, Triplagnostus, Yakutiana

Subtaxa: Ptychagnostus (Acidusus) Ptychagnostus (Ptychagnostus) Ptychagnostus acidusus Ptychagnostus affinis Ptychagnostus akanthodes Ptychagnostus aksayensis Ptychagnostus atavus Ptychagnostus convexus Ptychagnostus cuyanus Ptychagnostus intermedius Ptychagnostus karatauensis Ptychagnostus punctuosus Ptychagnostus richmondensis Ptychagnostus seminula Ptychagnostus sinicus Ptychagnostus spinosus Triplagnostus (Aristarius) aristarius Zeteagnostus incautus Zeteagnostus scarifatus

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Ecology: nektonic suspension feeder

Distribution:

• Marjumian of Canada (5: Newfoundland and Labrador collections), United States (10: New York, South Carolina, Utah)

• Cambrian of Antarctica (1), Argentina (3), Australia (20), Canada (14: British Columbia, New Brunswick, Newfoundland and Labrador), China (30), Denmark (2), Greenland (3), Italy (1), Kazakhstan (20), Mexico (1), Norway (3), Sweden (1), the United Kingdom (5), United States (27: Alaska, Montana, Nevada, Utah, Vermont)

Total: 146 collections including 220 occurrences

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