Demospongiae - Spirosclerophorida - Haplistiidae
Parent taxon: Rhizomorina according to R. M. Finks et al. 2004
Sister taxa: Azoricoidea, Laosciadia, Platychoniidae, Platychoniodea, Scleritodermatoidea, Sentinelia
Subtaxa: Boonderooia Chaunactis Columellaespongia Crawneya Haplistion Kazania Lewinia Monarchopemmatites Mortieria Nipterella Oremo Parodospongia Pemmatites Radiatospongia Rhaphidhistia Taplowia Varneycoelia Warrigalia
Type: Haplistion
Ecology: stationary epifaunal suspension feeder
Distribution:
• Permian of Canada (8: British Columbia, Nunavut collections), China (1), Italy (1), Mexico (6), Svalbard and Jan Mayen (9), United States (14: Arizona, Montana, Nevada, Texas)
• Carboniferous of Australia (1), Spain (2), the United Kingdom (2), United States (13: Alabama, Arizona, Arkansas, Indiana, Kentucky, Nevada, Oklahoma, Utah)
• Devonian of Australia (1), United States (2: Alaska, Tennessee)
• Silurian of Canada (7: Northwest Territories, Nunavut)
• Ordovician of Australia (3)
Total: 70 collections including 102 occurrences