†Elrathia spencei Resser 1939 (trilobite)
Trilobita - Ptychopariida - Alokistocaridae
Full reference: C. E. Resser. 1939. The Spence Shale and its fauna. Smithsonian Miscellaneous Collections 97(12):1-29
Belongs to Elrathia according to C. E. Resser 1939
Sister taxa: Elrathia hoboi, Elrathia idahoensis, Elrathia longiceps, Elrathia rara, Elrathia sampsoni
Type specimen: USNM 96540
Ecology: fast-moving epifaunal detritivore