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Checklist for Subfamily Tetradellinae Swartz, 1936
and region Middle Ordovician (Ordovician)


Class
 		Ostracoda
Latreille, 1802
Mussel shrimps, Ostracods, Seed Shrimps		27
105
71		Families
Genera
Species		 
Taxom
 

Order
 		Beyrichicopida
Pokorny, 1954
14
44
39		Families
Genera
Species		 
Taxom
 

Suborder
 		Palaeocopa
Henningsmoen, 1953
6
31
32		Families
Genera
Species		 
Taxom
 

Superfamily
 		Hollinacea
Swartz, 1936
2
20
23		Families
Genera
Species		 
Taxom
 
FamilyTetradellidae
Swartz, 1936
13
13		Genera
Species		 
Taxom
 
SubfamilyTetradellinae
Swartz, 1936
6
4		Genera
Species		 
Taxom
 


Genera for Middle Ordovician
6 Genera with 4 Species
Ceratopsis Ulrich, 1894
0SpeciesTaxom
Ctenobolbina Ulrich, 1890
0SpeciesTaxom
Dilobella Ulrich, 1894
0SpeciesTaxom
Ogmoopsis Hessland, 19591SpeciesTaxom
Polyceratella Öpik, 19401SpeciesTaxom
Tetradella Ulrich, 02SpeciesTaxom


Species list for Middle Ordovician
4 Species
Ogmoopsis variabilis Sarv, 1959
Polyceratella bonnemai Thorslund, 1940
Tetradella complicata
Tetradella perplexa