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Checklist for Superfamily Ptychoparioidea Matthew, 1887
and region Severn (Simcoe County, Ontario, Canada)


Class
 		Trilobita ♰
Walch, 1771
Trilobites		10
15
12		Families
Genera
Species		 
Taxom
 

Order
 		Ptychopariida ♰
Swinnerton, 1915
1
3
2		Family
Genera
Species		 
Taxom
 

Suborder
 		Ptychopariina ♰
Richter, 1932
1
3
2		Family
Genera
Species		 
Taxom
 

Superfamily
 		Ptychoparioidea ♰
Matthew, 1887
1
3
2		Family
Genera
Species		 
Taxom
 


List of families for Severn (Simcoe County)
1 Family width 2 Species
Alokistocaridae (Resser, 1939)2SpeciesTaxom


Genera for Severn (Simcoe County)
3 Genera with 2 Species
Alokistocare Lorenz, 19511SpeciesTaxom
Elrathia Walcott, 1924
0SpeciesTaxom
Elrathina Resser, 18871SpeciesTaxom


Species list for Severn (Simcoe County)
2 Species
Alokistocare paranotatum ♰ Rasetti, 1951
Elrathina cordillerae ♰ (ROMINGER, 1887)⇒ Ptychoparella cordillerae ROMINGER, 1887

Subnodes of Ptychoparioidea with occurrences in Severn (Simcoe County)
FamilyAlokistocaridae ♰
Resser, 1939
3
2		Genera
Species
Taxom