Ostracoda - Palaeocopida - Tetradellidae
Parent taxon: Hollinacea according to K. Lajblová and P. Kraft 2018
See also Bengtson 1992, Benson et al. 1961, Henningsmoen 1953, Lajblová and Kraft 2014, Liebau 2005, Mohibullah et al. 2013, Přibyl 1975 and Schallreuter and Hinz-Schallreuter 2011
Sister taxa: Chilobolbinidae, Egorovellidae, Euprimitidae, Euprimitiidae, Hithidae, Nanopsis, Oepikiumidae, Tvaerenellidae
Subtaxa: Bassleratiinae Bellornatia Fidelitella Foramenella Hippula Kiesowia Ogmoopsis Perspicillinae Piretellinae Raymondatia Reuentalina Sigmoopsinae Tetradella Tetradellinae Ushkarella Vittella
Ecology: epifaunal suspension feeder
Distribution:
• Devonian of United States (2: Pennsylvania collections)
• Silurian of Australia (1)
• Uhaku of the Russian Federation (18), Sweden (4)
• Dobrotivian of France (2), Morocco (1), Portugal (4), Spain (2)
• Letna of Czechia (1)
• Liben of Czechia (1)
• Chazyan of Canada (7: Northwest Territories)
• Hunderum of Norway (6), the Russian Federation (1)
• Billingen of Estonia (1)
• Arenig of China (1)
• Ordovician of Canada (31: Northwest Territories, Nunavut, Ontario, Quebec, Québec), Czechia (11), Estonia (3), India (1), Latvia (6), Lithuania (4), Morocco (2), Norway (10), the Russian Federation (18), Spain (3), Sweden (28), the United Kingdom (51), United States (45: Iowa, Kentucky, Michigan, Minnesota, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia)
Total: 265 collections including 479 occurrences