French paleontologist Paul Gervais described the new genus based on MNHN 1868-242, a humerus found at Mont Ventoux, near Bédoin.
The skeleton including femora, tibiae, fibulae and incomplete parts of a scapula, humerus, ulna, left and right ischium, vertebrae, ribs, partial armor over the pelvic girdle plus at least 60 detached armor plates and 8 teeth was found in the Late Cretaceous (Upper Campanian) marine Point Loma Formation, near Carlsbad, California.
Harry Govier Seeley named this genus in 1879 for a disarticulated partial postcranial skeleton that had been uncovered at Reach, Cambridgeshire, composed of a left dentary fragment, numerous vertebrae from the neck, back, and sacrum, parts of the pectoral girdle, humerus fragments, part of the left femur, left tibia, foot bones, ribs, and other fragments.
The species is solely known from the distal end of a right humerus found in the Middle Miocene (about 12 Ma), Bullock Creek deposits in Australia.
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The species is known solely from the holotype specimen, number QVM:2000:GFV:154, the distal end of a right humerus, conserved in the collections housed by the Queen Victoria Museum and Art Gallery in Launceston, Tasmania.
The holotype left humerus is held in the American Museum of Natural History (AMNH), which was a sponsor of the 1898-99 Patagonian expedition, led by John Bell Hatcher, on which Brown was the AMNH representative.
The fossil record of this species is fragmentary; remains in Cernay, France, include a mandible, a complete radius, and fragments of a humerus.
Glenoid labrum, a lip-like projection of cartilage on the human scapula surrounding the joint between the humerus and the shoulder blade
Ryan Bradley, American figure skater, suffered a spiral fracture in the humerus of his arm while playing dodge ball.