Trilobita - Asaphida - Ceratopygidae
Parent taxon: Asaphoidea according to J. M. Adrain 2011
See also Bao and Jago 2000, Harrington and Leanza 1957, Robison and Pantoja-Alor 1968 and Whittington et al. 1997
Sister taxa: Asaphidae, Remopleurididae
Subtaxa: Ajacicrepida Asiocephalus Boschchekulia Ceratopyge Charchaqia Diceratopyge Dichelepyge Dipleuropyge Haniwoides Hedinaspis Hunanopyge Hysterolenus Iwayaspidinae Kaltykelina Kaufmannella Kogenium Macropyge Macropygella Mansuyella Nannopeltis Neohedinaspis Onychopyge Proceratopyge Pseudohysterolenus Pseudoyuepingia Tamdaspis Tropidopyge Yuepingioides
Ecology: fast-moving low-level epifaunal carnivore
Distribution:
• Arenig of China (2 collections)
• Arenigian of Argentina (5)
• Ordovician of Argentina (10), Australia (1), China (1), Norway (5), the Russian Federation (1), Sweden (1), the United Kingdom (1), United States (1: Virginia)
• Tremadoc of Argentina (20), Bolivia (3), China (8), Colombia (1), the Czech Republic (2), France (2), Mexico (3), Norway (2), the Russian Federation (1), Spain (1), Sweden (3), United States (1: Virginia)
• Cressagian of the United Kingdom (2)
• Skullrockian of Argentina (1)
• Ibexian of Norway (1)
• Taoyuanian of China (49), the Russian Federation (12), South Korea (56)
• Cambrian to Ordovician of the Russian Federation (1)
• Cambrian of Argentina (8), Australia (34), Canada (4: British Columbia, Yukon), China (109), France (1), Kazakhstan (78), Norway (1), the Russian Federation (10), South Korea (1), the United Kingdom (1), United States (2: Nevada)
Total: 446 collections including 714 occurrences