Palaeoscolecida - Cricocosmida - Palaeoscolecidae
Parent taxon: Cricocosmida according to J. Han et al. 2007
See also Skovsted 2006 and Smith 2015
Sister taxa: Maotianshaniidae, Tylotitidae
Subtaxa: Guanduscolex Hadimopanella Kaimenella Mafangscolex Palaeoscolex Radnorscolex Sahascolex Scathascolex Wronascolex
Ecology: facultatively mobile shallow infaunal carnivore
Distribution:
• Silurian of the United Kingdom (3 collections)
• Ordovician of the United Kingdom (1)
• Cambrian of Antarctica (1), Australia (6), China (45), Greenland (13), the Russian Federation (2), Turkey (1), the United Kingdom (1), United States (1: Utah)
• Solvan of the Russian Federation (1)
• Amgan of Kyrgyzstan (1), the Russian Federation (1)
• Delamaran of United States (1: Utah)
• Caerfai of China (2)
Total: 80 collections including 85 occurrences