Ostracoda - Hollinocopida - Tetradellidae
Parent taxon: Hollinacea according to K. Lajblová and P. Kraft 2018
See also Bengtson 1992, Benson et al. 1961, Henningsmoen 1953, Mohibullah et al. 2013 and Schallreuter and Hinz-Schallreuter 2011
Sister taxa: Chilobolbinidae, Egorovellidae, Euprimitidae, Euprimitiidae, Hithidae, Nanopsis, Oepikiumidae, Piretellidae, Tvaerenellidae
Subtaxa: Bassleratiinae Bellornatia Fidelitella Foramenella Hippula Kiesowia Ogmoopsis Perspicillinae Piretellinae Raymondatia Reuentalina Sigmoopsinae Tetradella Tetradellinae Ushkarella Vittella
Ecology: epifaunal
Distribution:
• Devonian of United States (2: Pennsylvania collections)
• Silurian of Australia (1)
• Dobrotivian of France (1), Morocco (1), Portugal (4), Spain (2)
• Uhaku of the Russian Federation (18), Sweden (4)
• Letna of the Czech Republic (1)
• Chazyan of Canada (7: Northwest Territories)
• Volkhov of Lithuania (2), Norway (3)
• Hunderum of Norway (6), the Russian Federation (1)
• Arenig of China (1)
• Ordovician of Canada (31: Northwest Territories, Nunavut, Ontario, Quebec, Québec), the Czech Republic (7), Estonia (4), India (1), Latvia (6), Lithuania (2), Morocco (2), Norway (7), the Russian Federation (10), Spain (3), Sweden (28), the United Kingdom (51), United States (45: Iowa, Kentucky, Michigan, Minnesota, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia)
Total: 251 collections including 452 occurrences