†order Monocyathida Okulitch 1935 (archaeocyath sponge)
Parent taxon: Archaeocyatha according to F. Debrenne et al. 2015
See also Sepkoski 2002
Sister taxa: Adaecyathus, Ajacicyathida, Archaeocyathida, Butovia, Capsulocyathida, Cornutocyathus, Irregulares, Kazachstanicyathida, Putapacyathida, Regulares, Rhizacyathus
Subtaxa: Favilynthidae Globosocyathidae Monocyathidae Palaeoconulariidae Sajanolynthidae Tumuliolynthidae
Ecology: stationary intermediate-level epifaunal suspension feeder
Distribution:
• Cambrian of Antarctica (2 collections), Australia (1), Canada (4: British Columbia, Northwest Territories), Falkland Islands (Malvinas) (1), Mongolia (10), the Russian Federation (132), Spain (1), United States (1: Nevada)
Total: 152 collections including 368 occurrences