Istiodactylus were moderately large pterosaurs. Correcting earlier estimates of a length of fifty-six centimetres, Mark Paul Witton in 2012 concluded that the skull of one specimen, NHMUK R3877, was forty-three centimetres long.[1] The maximum wingspan was probably about 4.3 metres (14.1 ft),[1] making the largest individuals roughly half the size of the largest Pteranodon. Because of the flat, rounded shape of the snout, Istiodactylus is sometimes referred to as a "duck-billed pterosaur".[2] However, unlike ducks, they had teeth. These triangular teeth were laterally compressed, an adaptation for slicing flesh, and interlocked tightly in the closed jaws. The skull was relatively short, with most teeth concentrated in the blunt front tip of the jaws. Witton's 2012 study proposed that Istio