Species list, Checklist of Subfamily Sigmoopsinae for Middle Ordovician (Ordovician)

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Checklist for Subfamily Sigmoopsinae Henningsmoen, 1953
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
Family	Tetradellidae Swartz, 1936	13 13	Genera Species	Taxom
Subfamily	Sigmoopsinae Henningsmoen, 1953	2 3	Genera Species	Taxom

Genera for Middle Ordovician
2 Genera with 3 Species

Lomatobolbina Jaanusson, 1957		1	Species	Taxom
Sigmoopsis Henningsmoen, 0		2	Species	Taxom

Species list for Middle Ordovician
3 Species

Lomatobolbina craspedota Jaanusson, 1957
Sigmoopsis platyceras Öpik, 1937
Sigmoopsis schmidti