Parent taxon: Palaeoscolecidomorpha according to X. Shi et al. 2022
See also Sepkoski 2002, Smith 2015, Wills et al. 2012 and Zhang and Hua 2005
Sister taxa: Cricocosmiidae, Maotianshania, Markuelia
Subtaxa: Bohemoscolex Corallioscolex Cowiella Cricocosmida Floraconformis Gammascolex Milaculum Palaeoscolecida Plasmuscolex Protoscolex
Ecology: facultatively mobile shallow infaunal carnivore
Distribution:
• Silurian of the United Kingdom (3 collections), United States (4: Illinois, Iowa, Wisconsin)
• Ordovician of Canada (3: British Columbia, Nunavut, Ontario), China (1), the United Kingdom (2), United States (6: New York, Ohio, Wisconsin)
• Cambrian of Antarctica (1), Australia (6), China (47), Greenland (13), Mongolia (1), the Russian Federation (3), Turkey (1), the United Kingdom (6), United States (2: 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)
• Waucoban of Canada (1: Northwest Territories)
Total: 106 collections including 117 occurrences