Asteroidea - Euaxosida - Cnemidactinidae
Full reference: W. K. Spencer. 1918. A monograph of the British Palaeozoic Asterozoa. Monographs of the Palaeontographical Society, London 1916(3):109-168
Parent taxon: Euaxosida according to D. B. Blake 2018
See also Blake 1989, Blake and Guensburg 1993, Blake and Rozhnov 2007, Owen 1965, Spencer 1918 and Spencer and Wright 1966
Sister taxa: Devonistella, Eoactis, Helianthasteridae, Lacertasteridae, Lepidasteridae, Lepidasterina, Lepyriactis, Mesopalaeasteridae, Omanasteridae, Palasterinidae, Platanasteridae, Schondorfia, Taeniactis
Subtaxa: Cnemidactis
Type: Cnemidactis
Ecology: slow-moving low-level epifaunal carnivore
Distribution:
• Volkhov of the Russian Federation (1 collection)
• Ordovician of Norway (1), the United Kingdom (1), United States (1: Nevada)
Total: 4 collections each including a single occurrence