Genus: Symphyrophus COPE, 1878 (nomen dubium)
Etymology: Greek, symphyos “fused, solid”, Greek, orophe, “roof, ridgebole [dorsal vertebrae] + us: Solid roofed one.
= Symphyrosaurus HUENE, 1908 (sic)

Species: musculosus COPE, 1878 (nomen dubium)
Etymology: Greek, musculosus, "muscular."

Holotype: AMNH 5772

Locality: Garden Park, Canon City, Fremont County, Colorado.

Horizon: Member? Morrison Formation.

Biostratigraphy: Zone?

Age: Age?, Stage?, Malm Epoch, Late Jurassic.

Material: Vertebral centrum and distal end of femur.