†family Heloplacidae Cherns 2004 (chiton)
Parent taxon: Polyplacophora according to M. D. Sutton et al. 2025
Sister taxa: Dycheiidae, Emo, Mesoplacophora, Multiplacophora, Neoloricata, Prisochiton, Trachydermon, Oligochiton
Subtaxa: Acaenoplax Enetoplax Heloplax
Type: Heloplax
Ecology: facultatively mobile epifaunal grazer
Distribution:
• Silurian of Sweden (1 collection), the United Kingdom (1)
Total: 2 collections including 3 occurrences