Ikrandraco: the pterosaur with a blade-like lower-jaw crest

Ikrandraco avatar is an Early Cretaceous pterosaur from the Jiufotang Formation of Liaoning, China. Its low, elongated skull lacks an upper jaw crest but carries a deep, blade-like crest beneath the front of the lower jaw, ending in a small hook-shaped process. The type specimen, IVPP V18199, also preserves neck vertebrae and parts of the wings and foot; a second specimen preserves another skull and neck. Researchers proposed temporary skimming and a throat pouch, but neither behaviour nor soft tissue is fossilized. The pterosaur catalogue places the feeding proposal beside later work on jaw shape and crest function.

Quick facts

Two specimens from Jiufotang

Xiaolin Wang and colleagues named Ikrandraco avatar in 2014 from two flattened fossils in the Aptian Jiufotang Formation. The holotype, IVPP V18199, preserves an elongated skull and lower jaw, several neck vertebrae, part of the sternum, pieces of both wings and a foot element. IVPP V18406 is a second individual with a skull, jaws and anterior neck vertebrae. Its locality lies roughly 20 to 25 kilometres from the type locality. The authors noted differences in size and deformation and did not treat the specimens as one skeleton.

The type skull is about 28.7 centimetres long. It carries at least 21 small tooth sockets on each side of the upper jaw and at least 19 along each side of the lower jaw. Counts are minimums because some positions are incomplete or obscured. The fossil provides no preserved meal that identifies the prey.

The lower-jaw crest

The most distinctive feature is a deep, thin bony crest along the front part of the mandible, with a hook-like process at its rear edge. The skull is low and elongated and has no premaxillary crest. This combination separates Ikrandraco from many other toothed pterosaurs with crests positioned above the snout. The crest is part of the lower jaw itself; a soft covering, if present, did not fossilize.

A 2014 description suggested that the hook could have anchored a throat pouch and that the blade might have entered the water as the animal took fish near the surface. The authors themselves described the proposed skimming as reduced or temporary and recognized that Ikrandraco lacked the full set of adaptations seen in modern skimmers. A later morphometric study confirmed that the jaw is unusually crest-heavy, but it also reviewed competing explanations: feeding mechanics are debated, and social or sexual display may account for crests where a clear mechanical role is lacking. A measured jaw shape cannot identify one behaviour by itself.

Classification has changed

The original analysis placed Ikrandraco among pteranodontoids but did not include lonchodectid taxa in its comparison. Alexander Averianov’s 2020 revision included it in Lonchodectidae with Lonchodraco and Lonchodectes. That placement rests on small, similarly sized tooth sockets and a midline ridge on the palate, among other traits. Family-level relationships therefore reflect later comparative work rather than an undisputed label in the original description.

The crest also helps distinguish the animal from the nearby Jiufotang pterosaur Guidraco, which has much larger teeth and lacks a comparable lower-jaw blade. The two skulls suggest different anatomical strategies in the same regional fauna, but coexistence does not prove that their diets were divided in a particular way.

What the fossils cannot show

There is no preserved throat pouch, fish in the stomach or track of a skim-feeding pass. The Jiufotang lake deposits make access to aquatic prey plausible, but not exclusive. Crest function, surface feeding, colour, courtship and flight posture remain interpretations. The secure description is more focused: Ikrandraco was a toothed pterodactyloid with a distinctive hooked lower-jaw crest, known from two Chinese specimens that preserve valuable skull anatomy and only part of the rest of the skeleton.