Ferrodraco: an Australian pterosaur preserved in ironstone

Ferrodraco lentoni is a large pterosaur from the Winton Formation of Queensland, Australia. Found in 2017 near Winton, its fossil is one of the most complete pterosaur skeletons known from the continent, although it remains partial: preserved remains include skull fragments, neck vertebrae, parts of the shoulder and wing, and some hindlimb bones. Iron-rich rock encased the fossil, inspiring the name “iron dragon.” The pterosaur catalogue places it alongside other Australian forms while distinguishing measured fossil evidence from reconstruction.

Quick facts

Discovery in ironstone

Scott Lenton found the fossil in 2017 at the Pterosaur Site, locality AODL 245, near Belmont Station north-east of Winton in Queensland. The specimen, AODF 876, was formally described in 2019 by Adele Pentland and colleagues. Iron-rich sedimentary rock surrounds the bones, and the name Ferrodraco refers to that ironstone preservation. The species name honours Lenton.

The Winton Formation records Late Cretaceous environments in inland Queensland. Its fossil localities preserve dinosaurs and other vertebrates, but the formation's broad environmental history cannot specify the daily habitat or behaviour of this individual. The dated interval for the specimen is Cenomanian to lower Turonian, near the transition within the Late Cretaceous.

What AODF 876 preserves

The holotype includes fragments of the skull and cranial crests, five partial cervical vertebrae, portions of the shoulder girdle, forelimb and wing, and some hindlimb elements. That combination made it unusually informative compared with other Australian pterosaur fossils, many of which are isolated bones. “Most complete known from Australia” describes its place in that fossil record; it does not mean the skeleton is complete.

The original description estimated a wingspan of about four metres by comparing preserved measurements with better-known pterosaurs. Because the wing is incomplete, the estimate depends on reconstructing missing lengths and proportions. It is not a measured wingspan from an intact pair of wings. Body mass and exact size remain similarly dependent on comparative models.

An anhanguerid clarified by imaging

The first study recognized Ferrodraco as a pteranodontoid and discussed its position among Australian and other toothed pterosaurs. In 2021, a more detailed osteological account used microtomography at the Australian Synchrotron to inspect bones difficult to examine externally. The study supported a firm placement within Anhangueridae. Its closer relationships inside the family remain less certain, with Coloborhynchus and Australian forms such as Mythunga relevant to comparisons.

Synchrotron imaging can reveal internal surfaces and distinguish structures obscured by matrix or overlapping bones. It improves the anatomical record of the specimen, but cannot recover absent parts or settle every phylogenetic question. AODF 876 is still a partial individual whose preservation determines which comparisons are possible.

Diet and reconstruction

Anhanguerids had toothed jaws, and fish are commonly proposed as prey for the group. No stomach contents or directly associated prey have been reported for Ferrodraco, so a fish-based diet is an inference from its relatives and anatomy rather than a fossilized meal. The preserved bones also do not record membrane colour, crest soft tissues or social behaviour.

Reconstructions show a large flying pterosaur, but the exact wing outline and proportions depend on comparative anatomy. The best-supported picture is a roughly four-metre-span anhanguerid represented by a relatively informative partial skeleton from Queensland. Its completeness is notable in the Australian context, while many biological details remain unknown.