Rhynchonellata - Spiriferida - Trigonotretidae
Full reference: J. B. Waterhouse. 2004. Permian and Triassic stratigraphy and fossils of the Himalaya in northern Nepal. Earthwise 6:1-259
Parent taxon: Neospiriferidae according to J. B. Waterhouse 2004
Sister taxa: Betaneospirifer, Blasispirifer, Cartorhium, Costatispirifer, Crassispirifer, Cratispirifer, Fasciculatia, Fusispirifer, Gibbospirifer, Gypospirifer, Imperiospira, Kaninospirifer, Kaninospiriferinae, Lepidospirifer, Lutuginia, Maxwellispirifer, Neospirifer, Occidalia, Pondospirifer, Saltospirifer, Septospirifer, Simplicisulcus, Spiriferalaria, Tibetospirifer
Subtaxa: Cracowspira
Ecology: stationary epifaunal suspension feeder
Distribution: found only at UQ L4571, Rose's Pride Mine (Permian of Australia)