Genus: Amphicoelias COPE, 1877
Etymology: Greek, amphi, “around, on both sides’, and Greek, koilos, “hollow, concave”, + ias: “bioconcave (vertebrae)."

Species: altus COPE, 1877
Etymology: Latin, altus, "high'"

Holotype: AMNH 5764

Locality: Cope’s Quarry 12, Garden Park area, Canon City, Fremont County, Colorado.

Horizon: Upper Brushy Basin Member, Morrison Formation.

Biostratigraphy: Zone 4.

Age: Upper Part, Comobluffian age, Tithonian Stage, Uppermost Malm Epoch, Late Jurassic.

Material: 2 imperfect dorsal vertebrae nos, 6? and 10, right femur.

AMNH 5764a: Left scapula, left coracoid, right ulna, left pubis, distal end of a femur.

Referred material:

= Amphicoelias alta? FULLER, 2009 (sic)

Locality: Dana Quarry, Ten Sleep, Washakie County, Wyoming.

Horizon: Member?, Morrison Formation.

Biostratigraphy: Zone?

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


Number: Not given: Fragmentary skeleton.