†family Dionididae Gürich 1907 (trilobite)
Trilobita - Trinucleida - Dionididae
Parent taxon: Trinucleida according to A. Bignon et al. 2020
See also Adrain 2011, Jell and Adrain 2002 and Whittington et al. 1997
Sister taxa: Alsataspididae, Raphiophoridae, Trinucleidae
Subtaxa: Aethedionide Digrypos Dionide Dionidella Tongxinaspis Trinucleoides
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Dobrotivian of Czechia (2 collections), France (3), Portugal (1)
• Arenig of the United Kingdom (3)
• Ordovician of Canada (1: Quebec), China (27), Czechia (6), France (4), Ireland (1), Kazakhstan (3), Morocco (3), Norway (11), the Russian Federation (1), Sweden (4), Türkiye (1), the United Kingdom (10), United States (7: Maine, Virginia)
Total: 88 collections including 93 occurrences