The coracoid bones of the shoulders in spinosaurids were robust and hook shaped. The arms were relatively large and well-built; the radius (long bone of the forearm) was stout and usually only half as long as the humerus (upper arm bone). Spinosaurid hands had three fingers, typically of tetanurans, and wielded an enlarged ungual on the first finger (or "thumb"), which formed the bony core of a keratin claw. In genera like "Baryonyx" and "Suchomimus", the phalanges (finger bones) were of conventional length for large theropods, and bore hook-shaped, strongly curved hand claws. Based on fragmentary material from the forelimbs of "Spinosaurus", it appears to have had longer, more gracile hands and straighter claws than other spinosaurids.