†Athyris subquadrata Yang and Xu 1966 (lamp shell)
Rhynchonellata - Athyridida - Athyrididae
Belongs to Athyris according to R. L. Feng and Z. L. Jiang 1978
Sister taxa: Athyris (Cliothyris), Athyris ambiguaeformis, Athyris angulata, Athyris bisulcata, Athyris cestriensis, Athyris damesi, Athyris globularis, Athyris plicatiformis, Athyris sulcata, Athyris xetra
Ecology: stationary low-level epifaunal suspension feeder
Average measurements (in mm): valve 15.7 x 15.4