Trilobita - Phacopida - Phacopidae
Full reference: E. N. K. Clarkson, N. Eldredge, and J.-L. Henry. 1977. Some Phacopina (Trilobita) from the Silurian of Scotland. Palaeontology 20(1):119-142
Parent taxon: Acernaspis according to E. N. K. Clarkson et al. 1977
Sister taxa: Acernaspis copperi, Acernaspis elliptifrons, Acernaspis khatangensis, Acernaspis nanus, Acernaspis orestes, Acernaspis superciliexcelsis, Acernaspis xynon
Subtaxa: Acernaspis (Eskaspis) sufferta Acernaspis (Eskaspis) woodburnensis
Type: Eophacops sufferta
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Silurian of the United Kingdom (9 collections)
• Ordovician to Silurian of Canada (1: Québec), the Russian Federation (1)
Total: 11 collections each including a single occurrence