Rhynchonellata - Athyridida - Athyrididae

Full reference: G. H. Girty. 1908. The Guadalupian fauna. United States Geological Survey Professional Paper 58:1-651

Belongs to Composita according to G. A. Cooper and R. E. Grant 1976

Sister taxa: Athyris (Composita) indosinensis, Athyris (Composita) semirostrata, Composita advena, Composita apheles, Composita apsidata, Composita bamberi, Composita biforma, Composita bucculenta, Composita costata, Composita cracens, Composita crassa, Composita depressa, Composita discina, Composita elongata, Composita emarginata, Composita enormis, Composita grandis, Composita hapsida, Composita huagongensis, Composita idahoensis, Composita imbricata, Composita jogensis, Composita longa, Composita magnicarina, Composita mexicana, Composita minuscula, Composita mira, Composita misriensis, Composita nucella, Composita ovata, Composita parasulcata, Composita pilula, Composita plana, Composita prospera, Composita pyriformis, Composita quadrirotunda, Composita quantilla, Composita rotunda, Composita sigma, Composita stalagmium, Composita strongyle, Composita subcircularis, Composita subquadrata, Composita subtilita, Composita subtriangularis, Composita tareica, Composita tetralobata, Composita tobaensis

Type specimen: USNM 118609a

Ecology: stationary low-level epifaunal suspension feeder

Average measurements (in mm): shell 11.5 x 10.5