†family Symphysurinidae Kobayashi 1955 (trilobite)
Trilobita - Asaphida - Symphysurinidae
Parent taxon: Cyclopygoidea according to R. A. Fortey and D. L. Bruton 2013
Sister taxa: Cyclopygidae, Nileidae, Taihungshaniidae
Subtaxa: Eurysymphysurina Randaynia
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Ordovician of Canada (17: Newfoundland, Newfoundland and Labrador collections), Norway (2), United States (2: Oklahoma)
• Skullrockian of Canada (1: Newfoundland)
Total: 22 collections each including a single occurrence