Feilongus: a long-skulled pterosaur from Early Cretaceous China

Feilongus was a toothed pterosaur from the Early Cretaceous of Liaoning, China. Its type fossil, IVPP V 12539, is a nearly complete skull and lower jaw about 39 to 40 centimetres long, but it preserves no associated wings or body. The skull carries two crests and a pronounced overbite, with slender teeth concentrated toward the front. A second specimen referred to Feilongus preserves a skull and several neck vertebrae, but it is a different fossil from the type. The pterosaur catalogue keeps those records distinct.

Quick facts

The skull that named Feilongus

The genus was described in 2005 from IVPP V 12539, a large and unusually informative pterosaur skull from the Yixian Formation. It includes the upper and lower jaws and measures roughly 39 to 40 centimetres. The front of the upper jaw extends beyond the lower one, producing a pronounced overbite. Two crests occur on the skull: a low crest near the snout and a larger crest toward the rear. Their bony bases are fossil evidence; any keratinous covering or exact outline is unknown.

The skull also has long, narrow jaws with many teeth, concentrated in their anterior portions. The original description noted roughly 78 teeth in the type specimen, though counts and visibility depend on preservation. Some teeth are slender and slightly curved. The pattern differs from the short, robust teeth of a hard-prey specialist and is compatible with catching small prey, but it does not prove a precise diet.

Do not combine separate specimens

The type specimen does not include an associated wing or complete postcranial skeleton. A second, later specimen from the Jiufotang Formation near Beipiao, catalogued as DNMHM D3068, preserves another skull and four cervical vertebrae. It has been referred to Feilongus sp. and helped clarify variation and diagnosis. It remains separate from IVPP V 12539: the two fossils do not make one composite individual.

This distinction affects size estimates. A wingspan around 2.4 metres has been proposed by scaling from the skull and comparing it with other pterosaurs, but the type has no wing bones to measure. The estimate is therefore an extrapolation, not a dimension recorded by the type skeleton. The skull's large size also does not establish that the individual was fully mature; its growth stage has been discussed as possibly immature.

Taxonomy and environment

Feilongus is generally placed among ctenochasmatids, a diverse pterosaur group that includes forms with elongated skulls. Family placement draws on cranial and postcranial traits, and the incomplete association of material imposes limits. Comparisons with Ctenochasma are useful for understanding long-jawed pterosaurs, but their teeth and skulls are not identical.

The type comes from the Yixian Formation, whose lake deposits preserve a rich Early Cretaceous fauna. The referred DNMHM D3068 was reported from the younger Jiufotang Formation. That broader geological distribution should not be collapsed into one exact locality or ecological scene. Different formations and specimens can document a genus across time without showing that each individual shared the same habitat.

What teeth suggest, and what they do not

Slender teeth and long jaws have led authors to suggest that Feilongus captured small aquatic animals, perhaps fish. Such prey are plausible, but there is no gut content or prey fossil directly tied to the type. A fish-catching reconstruction is a functional interpretation based on anatomy and comparison. It should not be presented as a fossilized meal.

What can be said with confidence is that the animal had a long, tooth-bearing skull with two crests and that its known postcranial record is limited. The wingspan, exact head crest outline, colours, flight performance and feeding motions remain reconstructions or open questions.