†family Sigmoopsidae Henningsmoen 1953 (ostracod)
Ostracoda - Palaeocopida - Sigmoopsidae
Full reference: G. Henningsmoen. 1953. Lower Ordovician Ostracods from the Oslo region, Norway. Norsk Geologisk Tidsskrift 33:41-68
Parent taxon: Tetradelloidea according to A. Liebau 2005
Sister taxa: Ctenoloculinidae, Ctenonotellidae, Soanellidae
Subtaxa: none
Ecology: epifaunal suspension feeder
Distribution:
• Uhaku of Sweden (2 collections)
• Chazyan of Canada (2: Northwest Territories)
• Ordovician of Canada (2: Northwest Territories, Québec), Latvia (5), Morocco (1), the Russian Federation (8), Sweden (7)
Total: 27 collections including 37 occurrences