Rhynchonellata - Terebratulida - Spasskothyrididae
Parent taxon: Loboidothyridoidea according to A. Williams et al. 2006
Sister taxa: Alabushevothyrididae, Boreiothyrididae, Cheirothyropsidae, Cheniothyrididae, Clathrithyrididae, Dictyothyrididae, Dienopidae, Eplenyithyris, Goniothyridinae, Harpotothyrididae, Hesperithyrididae, Heterobrochinae, Jaisalmeria, Kendzhilgithyris, Lissajousithyrididae, Loboidothyrididae, Lobothyrididae, Lobothyroides, Magharithyris, Mametothyrididae, Muirwoodellidae, Naradanithyris, Neumayrithyris, Pamirothyris, Peristerothyris, Plectoconchidae, Postepithyrididae, Psebajithyridinae, Rugithyris, Sogxianthyris, Taurothyris, Tchegemithyrididae, Tegulithyrididae, Triadithyrididae, Trichothyris, Trigonithyrididae, Tshemsarythyris, Viallithyris, Weldonithyris
Subtaxa: Spasskothyris Volgathyris
Type: Spasskothyris
Ecology: stationary low-level epifaunal suspension feeder
Distribution: found only at Petrishchevo (Cretaceous of Russian Federation)