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⌕
Checklist for Subfamily Tvaerenellinae Jaanusson, 1957
and region USA (North America)


Class
 		Ostracoda
Latreille, 1802
Mussel shrimps, Ostracods, Seed Shrimps		131
993
4403		Families
Genera
Species		 
Taxom
 

Order
 		Beyrichicopida
Pokorny, 1954
20
113
417		Families
Genera
Species		 
Taxom
 

Suborder
 		Palaeocopa
Henningsmoen, 1953
12
83
247		Families
Genera
Species		 
Taxom
 

Superfamily
 		Hollinacea
Swartz, 1936
3
24
114		Families
Genera
Species		 
Taxom
 
FamilyTvaerenellidae
Jaanusson, 1957
5
20		Genera
Species		 
Taxom
 
SubfamilyTvaerenellinae
Jaanusson, 1957
1
1		Genus
Species		 
Taxom
 


Genera for USA
1 Genera with 1 Species
Piretia Jaanusson, 19821SpeciesTaxom


Species list for USA
1 Species
Piretia shawi ♰ Copeland, 1982