Cearadactylus: a pterosaur skull corrected by preparation

Cearadactylus atrox is known from an unusually informative pterosaur skull from Brazil's Araripe Basin. For years, the front of the skull seemed to show an odd gap and an unusual bite. Later preparation revealed that a broken piece had been attached in the wrong position. Resetting it changed the outline of the snout and clarified which features were anatomical.

The holotype preserves most of the skull and an articulated lower jaw, but no wing or body skeleton. Its long jaws and enlarged front teeth support a fish-catching interpretation, not a recorded hunting event. The genus belongs in the pterosaur catalogue with that distinction between preserved skull and reconstructed animal kept in view.

Quick facts

A skull from the Romualdo Formation

Giuseppe Leonardi and Guido Borgomanero formally described Cearadactylus atrox in 1985. The holotype, MN 7019-V, is a skull without the rear skull region, with the lower jaw preserved in articulation. It came from the Romualdo Formation of the Araripe Basin in north-eastern Brazil, a deposit famous for exceptionally preserved Early Cretaceous fossils.

The history of collection is incompletely documented, as is true for many Araripe fossils that entered collections through commercial channels. The specimen itself remains the central evidence: it is not accompanied by a wing, trunk or tail, so the familiar full-body image uses comparison to other pterosaurs.

Why the first reconstruction changed

The front of the skull had been broken and later attached in the wrong position. In the original arrangement, the mismatch created an apparent gap and an unusual relationship between upper and lower jaws. During later preparation, the fragment was removed and reset. The upper jaw proved to widen more than the lower one, and the apparent gap disappeared.

This was not a discovery of a second animal or a new species. It was a correction to how the existing fossil had been assembled. The revised geometry changed the bite reconstruction and which anatomical characters could be compared with other pterosaurs.

Long jaws and grasping teeth

The skull is elongated, and the tooth rows contain larger teeth toward the front that become smaller farther back. The original material has been described with roughly 32–36 upper and 22–26 lower teeth, although exact counts depend on which sockets are visible and how damaged margins are interpreted. A groove on the lower jaw divides near its tip, while the external openings occupy a high position on the skull.

Enlarged anterior teeth could have helped seize slippery prey. Fish are a plausible part of the diet in the aquatic Romualdo setting, but no stomach contents document a meal from this individual. The anatomy supports a functional interpretation; it does not show the exact prey or the pterosaur's method of capture.

The Brazilian Anhanguera provides a useful comparison among toothed pterodactyloids. Similarities do not make the genera interchangeable: each skull must be assessed by its own combination of jaw shape, tooth spacing and other characters.

Relationships and missing body parts

The genus has been assigned to different positions in pterosaur family trees. Earlier classifications placed it among ornithocheirids or ctenochasmatids, while later analyses have often recovered it close to Anhangueridae. The reset skull makes some comparisons more meaningful, but a phylogenetic result remains an inference from anatomical characters, not a direct view of ancestry.

Because the holotype is essentially a skull, its wingspan and total body proportions cannot be measured. Estimates borrow ratios from more complete relatives. Colour, soft tissues, flight performance and sexual differences are also unknown. The skull anchors the name; it does not supply every part of the animal shown in a reconstruction.