Trilobita - Olenida - Eulomidae
Parent taxon: Olenida according to J. M. Adrain 2011
See also Jell and Adrain 2002
Sister taxa: Andrarinidae, Aphelaspidae, Asaphiscidae, Cedariidae, Dokimokephalidae, Idahoiidae, Loganellidae, Olenidae, Parabolinoididae, Pterocephaliidae
Subtaxa: Acrocephalaspina Altaiaspis Amzasskiella Crucicephalus Dolgeuloma Duplora Euloma Eulominae Iveria Karataspis Ketyna Kujandaspis Limpeina Loparella Lopeuloma Natmus Pareuloma Probilacunaspis Proteuloma Pseudoacrocephalites Stigmatoa
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Klabava of the Czech Republic (2 collections)
• Arenig of France (1), Morocco (1), Sweden (3)
• Ordovician of Australia (1), Canada (1: Newfoundland and Labrador), France (1), Morocco (5), Norway (3), the Russian Federation (11), Sweden (4), the United Kingdom (2), United States (1: Nevada)
• Cressagian of the United Kingdom (3)
• Tremadoc of Argentina (1), Canada (1: Newfoundland and Labrador), China (10), the Czech Republic (3), France (7), Iran (1), Norway (1), the Russian Federation (5), Spain (2), Sweden (3), the United Kingdom (2), United States (1: Montana)
• Cambrian to Ordovician of Canada (1: Quebec), the Russian Federation (2)
• Cambrian of Australia (29), China (16), France (1), Kazakhstan (66), the Russian Federation (25), United States (1: Nevada)
• Taoyuanian of China (10), the Russian Federation (2)
Total: 229 collections including 302 occurrences