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Checklist for Order Ptychopariida Swinnerton, 1915
and region Arkansas (USA)


Class
 		Trilobita ♰
Walch, 1771
Trilobites		31
58
49		Families
Genera
Species		 
Taxom
 

Order
 		Ptychopariida ♰
Swinnerton, 1915
2
4
3		Families
Genera
Species		 
Taxom
 


List of families for Arkansas
2 Families width 3 Species
Elviniidae Kobayashi, 19352SpeciesTaxom
Norwoodiidae Walcott, 19161SpeciesTaxom


Genera for Arkansas
4 Genera with 3 Species
Cliffia Wilson, 1951
0SpeciesTaxom
Irvingella ULRICH & RESSER, 19241SpeciesTaxom
Jessievillia HOHENSEE, 19891SpeciesTaxom
Xenocheilos Wilson, 19491SpeciesTaxom


Species list for Arkansas
3 Species
Irvingella major ♰ ULRICH & RESSER, 1924
Jessievillia radiatus ♰ Hohensee, 1989
Xenocheilos minutum ♰ Wilson, 1949

Subnodes of Ptychopariida with occurrences in Arkansas
SuborderPtychopariina ♰
Richter, 1932
2
4
3		Families
Genera
Species
Taxom



Links, sources and further information
Ptychopariida at gbif.org
Ptychopariida at irmng.org