Artiopoda - Agnostida - Spinagnostidae
Alternative spelling: Spinagnostiidae
Synonym: Hypagnostidae Ivshin 1953
Parent taxon: Condylopygoidea according to E. B. Naimark and T. V. Pegel 2017
See also Landing et al. 2008, Paterson and Laurie 2004, Pour and Popov 2009 and Whittington et al. 1997
Sister taxa: Agnostidae, Ammagnostidae, Clavagnostidae, Condylopygidae, Diplagnostidae, Doryagnostidae, Glaberagnostus, Glyptagnostidae, Glyptagnostinae, Leiagnostus, Megagnostus, Metagnostidae, Phalacromidae, Phalagnostus, Phaldagnostus, Pseudagnostidae, Ptychagnostidae, Valenagnostus
Subtaxa: Cotalagnostus Eoagnostus Peratagnostus Raragnostus Spinagnostinae Tomagnostella
Ecology: slow-moving epifaunal detritivore
Distribution:
• Taoyuanian of China (15 collections), the Russian Federation (4), South Korea (17)
• Cambrian of Antarctica (2), Argentina (4), Australia (17), Canada (28: British Columbia, New Brunswick, Newfoundland and Labrador, Yukon), China (147), Czechia (2), Denmark (1), Greenland (9), India (2), Kazakhstan (72), Kyrgyzstan (1), Mexico (1), New Zealand (1), Norway (3), the Russian Federation (7), South Korea (1), Sweden (11), the United Kingdom (3), United States (13: Alaska, New York, South Carolina, Utah, Vermont)
• Solvan of Czechia (1)
Total: 362 collections including 526 occurrences