The thorax and scutellum are black and somewhat polished; the humeri are lightcoloured.
It contains six vertebrae, the coracoids, the humeri, a right radius and three spines.
The heads of the "humeri" and "femora" with many fossils show necrosis of the bone tissue, caused by a too rapid ascent after deep diving.
The arms were short, with longer upper arms (humeri) than lower arms (ulna).
The humeri do not have a free medullary cavity.
The postcranial skeleton includes several articulated neural arches with ribs, most of the left shoulder girdle, humeri, right radius and ulna, and a femur.
The humeri are robust, about 63 cm long, with very expanded distal and proximal ends.
Six humeri have been found; the bone is robust and an entepicondylar foramen is present in the distal (far) end.
