Southern hunter

Australovenator wintonensis inhabited the floodplains of the Winton Formation in the Cenomanian, a landscape of meandering rivers, shallow lakes, and riparian forests covering the interior of southern Gondwana. The climate was warm-temperate, with marked seasons, typical of a subpolar latitude, since at that time Australia remained attached to Antarctica and lay much farther south than today. Conifers, ginkgoales, ferns, and the earliest angiosperms formed dense vegetation along the river channels, and the sediments that preserved Banjo correspond to a mud pocket on a flooded plain, where a young sauropod died and was buried together with the theropod.

Australovenator was an agile, medium-sized predator, with large, recurved manual claws on the first and second fingers, used to hold prey, and an elongate jaw with long serrated teeth, better adapted to slicing flesh than to crushing bone. The combination of long arms, a mobile wrist (White et al. 2015), and hook-like claws is typical of megaraptorids: rather than relying primarily on the skull like northern tyrannosaurids, Australovenator immobilized prey with its hands and sliced with its teeth. The most likely prey were medium-sized Winton ornithopods and hatchlings or juveniles of titanosauriform sauropods, such as young Diamantinasaurus.

The biomechanics of the forelimb suggest active hunting behavior, with the animal pursuing or ambushing prey and using its hands to bring down and immobilize targets of its own size or smaller. Long, slender legs (White et al. 2013) support cursorial locomotion in the open or semi-open terrain of the floodplain, with the capacity for rapid bursts in the final approach. There is no direct evidence of group living in Australovenator.

Australovenator is a gracile megaraptorid, with long, well-developed arms and enormous manual claws, an atypical combination for most tetanuran theropods, which tend to reduce forelimbs in large-bodied groups. The presence of rapidly growing bone tissues, inferred by analogy with the juvenile Megaraptor described in Porfiri et al. (2014), is consistent with high metabolism and endothermy, a common pattern in Coelurosauria. The animal likely had a filamentous feather covering over at least parts of the body, as suggested by most modern reconstructions of the group.

Founding paper of Australovenator wintonensis, published in PLoS ONE 4(7): e6190. Hocknull and colleagues describe three new Winton, Queensland dinosaurs from material collected in 2006 at Elderslie Station: the theropod Australovenator, the titanosauriform sauropod Diamantinasaurus, and the sauropod Wintonotitan. Holotype AODF 604 preserves dentary, cervical, dorsal, and caudal vertebrae, forelimb and hindlimb elements, pelvic girdle, and foot bones, representing the most complete Australian theropod ever described. The original phylogenetic analysis places the taxon within Carcharodontosauria (Neovenatoridae), a hypothesis later revised by other authors who recover Megaraptora within Coelurosauria. The paper also presents a locality map, stratigraphic section of the Winton, and body silhouettes with the recovered bones.

Locality map and stratigraphic column of the Winton Formation, showing the position of site AODL 85 at Elderslie Station and the level at which the Australovenator holotype was recovered.

Body silhouettes of the three holotypes described by Hocknull and colleagues (2009): Australovenator, Diamantinasaurus, and Wintonotitan, with recovered bones shaded in black.

Figure 1. Locality Map and Stratigraphy.

Table 1. Latest Albian (mid-Cretaceous) fauna currently known from the Winton Formation.

Figure 2. Silhouettes of the three new dinosaurs showing the material currently known from their respective holotypes.

Figure 3. Dorsal ribs of Diamantinasaurus matildae .

White and colleagues describe new forearm elements of the holotype, excavated in field seasons subsequent to the 2009 paper. The material includes radius, ulna, carpals, metacarpals, and manual phalanges, allowing the most complete reconstruction yet of the forelimb of an Australian theropod. The bones confirm long arms relative to the trunk and large, recurved manual unguals, a pattern typical of megaraptorans. The work reinforces the hypothesis that Australovenator relied on its hands as its primary predation tool.

Forearm elements of Australovenator wintonensis, including radius, ulna, carpals, and metacarpals in multiple views.

Anatomical comparison of manual phalanges and recurved claws with other megaraptorans, reinforcing the group's characteristic morphology.

Figure 1. Locality Map and Stratigraphy.

Figure 2. Articulated right manus elements.

Figure 3. Right Humerus.

Figure 4. Left Humerus.

Second paper by White and colleagues on additional holotype material, now focused on the hindlimb. Tibia, fibula, astragalus, metatarsals, and pedal phalanges are described in detail, making Australovenator the most complete leg ever recovered for the family. Proportions suggest long, agile legs, consistent with a pursuit predator in relatively open terrain. This set also allows Australovenator to be compared with Fukuiraptor from Japan and with other megaraptorans, providing a solid anatomical basis for subsequent phylogenetic analyses.

Hindlimb elements of the Australovenator wintonensis holotype, including tibia and fibula.

Astragalus, metatarsals, and pedal phalanges, with anatomical comparison to the hindlimbs of other tetanuran theropods.

Figure 1. Locality and dig site.

Figure 2. Right femur.

Figure 3. Right and left tibia.

Figure 4. Right and left fibula.

Biomechanical study that digitally models the holotype forelimb and tests its range of motion. Shoulder, elbow, and manus were reconstructed from surface scans and CT data, revealing an arm capable of prolonged flexion and supination, consistent with prey-grappling behavior. The study supports the interpretation of Australovenator as a predator that relied on its hands, with manual claws acting as hooks to hold active animals.

Digital models of the Australovenator forelimb used in the range-of-motion test.

Diagrams of angular ranges at the shoulder and elbow, suggesting active use of the arm in prey capture.

Fig 1. Australovenator wintonensis .

Fig 2. Determining range of motion from three dimensional meshes.

Fig 3. Articulated right humerus and antebrachium.

Fig 4. Right forearm and manus of Australovenator and Gallus forearm.

Detailed description of the holotype's dentary, with analysis of tooth morphology and replacement pattern. Teeth are serrated, elongate, and laterally compressed, typical of a flesh-slicing theropod. Comparison with Murusraptor and Megaraptor supports a shared megaraptorid dentition pattern marked by elongate jaws and slicing rather than crushing teeth. This morphological set indicates that megaraptorids captured prey with their hands and sliced tissue with the skull, a functional division distinct from that of northern tyrannosaurids.

Dentary of the Australovenator wintonensis holotype in multiple views, with tooth sockets and preserved teeth.

Details of dental morphology with serrations, interspecific comparison among megaraptorids.

Figure 1: Reconstruction of Australovenator wintonensis. Artwork created by Travis R. Tischler. Download full-size image DOI: 10.7717/peerj.1512/fig-1

Figure 2: Reconstructed dentary of Australovenator wintonensis by Travis R. Tischler. (A) Labial;(B) Lingual; (C) Cranial; (D) Anterior. Download full-size image DOI: 10.7717/peerj.1512/fig-2

Figure 3: Australian Age of Dinosaur Localities of Australovenator holotype and isolated theropod teeth. (A) Topographic map of all five localites and their relative position within the Eromanga Sedimentary Basin: Matilda Site (AODL 85), Pete Site (AODL 125), Pegler’s Site (AODL 124), and Wade Site (AODL 82); (B) Holotype quarry of Australovenator Matilda Site; (C) Pegler’s Site; (D) Pete Site; (E) Wade Site. Download full-size image DOI: 10.7717/peerj.1512/fig-3

Figure 4: The holotype right dentary of Australovenator wintonensis AODF604. Photographs in: (A) Dorsal; (C) Labial; (E) Lingual. Digital renders in: (B) Dorsal; (D) Labial; (F) Lingual; (G) second tooth of the right dentary preserving denticles; (H) close up of denticles. Abbreviations: dc, distal carina; imp, intramandibular process of dentary; ld, lateral depression; lab, labial depression; pdg, paradental groove; Mg, Meckelian groove. Scale bar = 10 cm. Download full-size image DOI: 10.7717/

Bell, Cau, Fanti, and Smith describe a gigantic manual claw and associated phalanges recovered at Lightning Ridge, New South Wales, in the Griman Creek Formation. The specimen, informally nicknamed Lightning Claw, is phylogenetically analyzed and recovered as a close relative of Australovenator wintonensis, supporting a Gondwanan origin for Megaraptoridae. The combination of Lightning Claw and Australovenator becomes the main evidence that the oldest known megaraptorids are Australian, and that the group dispersed from there to South America and Antarctica. As the paper is published in a commercial journal without open figures on the PMC CDN, images in this entry are replaced with equivalent figures from a contemporary open-access article on Megaraptora biogeography (Morrison et al. 2025), marked as comparative.

Comparative image: biogeographic map and phylogenetic topology of Megaraptora in Morrison et al. (2025), illustrating the group's Gondwanan origin, a hypothesis also supported by Bell et al. (2016) for Lightning Claw.

Comparative image: dispersal routes of Megaraptora among Gondwanan fragments, consistent with the hypothesis of Bell et al. (2016) for the group's origin.

Novas and colleagues review Cretaceous carnivorous theropods from Patagonia and present a new phylogenetic analysis that recovers Megaraptora within Coelurosauria, close to Tyrannosauroidea, rather than within Allosauroidea as in the original 2009 hypothesis on Australovenator. This reinterpretation radically changes the evolutionary scenario: megaraptorids are now seen as Gondwanan tyrannosauroids with well-developed arms, in contrast with the arm reduction of northern tyrannosaurids. The paper is commercial, without open figures on the CDN; images here are replaced with equivalent figures from Rolando et al. (2022), on Maip macrothorax, which discusses the same topology.

Comparative image: locality map for Maip macrothorax in Rolando et al. (2022), illustrating central Patagonia as a key region for Megaraptoridae, a theme also treated in Novas et al. (2013).

Comparative image: skeletal elements of a Patagonian megaraptorid in Rolando et al. (2022), used to support hypotheses equivalent to those of Novas et al. (2013).

Porfiri and colleagues describe a juvenile specimen of Megaraptor with previously unknown cranial parts and histological growth data. The phylogenetic analysis reinforces the position of Megaraptora within Tyrannosauroidea, a hypothesis that also applies to Australovenator wintonensis, the sister taxon of Patagonian megaraptors in several topologies. The work allows, for the first time, the reconstruction of a megaraptorid's ontogeny and provides a reference for estimating how Australovenator grew from hatchling to adult. Commercial article; images replaced with figures from Coria and Currie (2016) on Murusraptor, an open-access Patagonian megaraptorid.

Comparative image: skull and cranial elements of Murusraptor barrosaensis in Coria and Currie (2016), used as an analog to the juvenile Megaraptor material discussed in Porfiri et al. (2014).

Comparative image: postcranium of Murusraptor with reference to the ontogenetic history discussed for megaraptorids in Porfiri et al. (2014).

Coria and Currie describe Murusraptor barrosaensis, a Late Cretaceous Patagonian megaraptorid theropod, with a partial skull, vertebrae, and appendicular elements. The phylogenetic analysis recovers Megaraptoridae as a cohesive clade within Coelurosauria, including Australovenator wintonensis among the most basal species. The article is a key reference for understanding Australovenator because Murusraptor is the megaraptorid with the most complete known skull, allowing inference of what the Australovenator skull may have looked like, known only from the dentary. Both share elongate jaws and serrated teeth.

Skull and maxilla of Murusraptor barrosaensis in Coria and Currie (2016), the main reference for inferring the cranial morphology of Australovenator.

Cladogram recovering Megaraptoridae, including Australovenator, within Coelurosauria.

Fig 1. A) Skull reconstruction of Murusraptor barrosaensis , MCF-PVPH-411. B) Body reconstruction of Murusraptor barros aensis, MCF-PVPH-411.

Fig 2. Location and geological context of the holotypeof Murusraptor barrosaensis , MCF-PVPH-411.

Fig 3. Field photos of the excavation of MCF-PVPH-411 ( Murusraptor barrosaensis ).

Fig 4. Right lacrimal and postorbital of Murusraptor barrosaensis , holotype, MCF-PVPH-41.

Azuma and Currie describe Fukuiraptor kitadaniensis, a theropod from the Lower Cretaceous of Japan. Initially treated as a carnosaur, Fukuiraptor is recovered in several subsequent phylogenetic analyses, such as Hocknull et al. (2009) and Rolando et al. (2022), as the sister taxon or a close relative of Australovenator wintonensis, supporting the idea of a megaraptoran lineage distributed across Japan, Australia, South America, and Antarctica. The article is published in a commercial journal; figures here are replaced by the Hocknull 2009 cladogram and by a comparative figure from Rolando 2022 that places Fukuiraptor in the phylogenetic context.

Comparative image: stratigraphically calibrated cladogram from Hocknull et al. (2009), including Fukuiraptor among the close relatives of Australovenator.

Comparative image: Megaraptora phylogeny in Rolando et al. (2022), where Fukuiraptor appears close to Australovenator and related Australian taxa.

Molnar, Flannery, and Rich describe a theropod astragalus recovered at Dinosaur Cove, Victoria, in the Australian Lower Cretaceous. Originally compared with allosaurids, the bone was later reinterpreted by Benson et al. (2010) as belonging to Megaraptoridae, which would make it, together with Lightning Claw, one of the earliest indications that the group has deep roots in the Australian record. The paper predates the formal description of Australovenator by nearly three decades and forms the historical basis for the debate on Australian large theropods. Commercial article; figures replaced with material from Rolando 2022.

Comparative image: axial elements of a Patagonian megaraptorid in Rolando et al. (2022), illustrating morphology comparable to the Australian material from Victoria.

Comparative image: additional appendicular elements in Rolando et al. (2022), contextualizing the Dinosaur Cove astragalus within the Gondwanan setting.

Rich and Vickers-Rich synthesize a series of works that revised the Dinosaur Cove astragalus NMV P150070 over the years, reinterpreting the material in light of new Australian discoveries. The discussion anticipated the formal reassignment to Megaraptoridae in Benson et al. (2010) and prepared the ground for the description of Australovenator in 2009. Commercial material; figures replaced with Rolando 2022 and an additional figure from Hocknull 2009.

Comparative image: additional megaraptorid elements in Rolando et al. (2022), used here as an analog to the Dinosaur Cove astragalus.

Comparative image: Australovenator vertebrae in Hocknull et al. (2009), Australian context for the revision of the Dinosaur Cove material.

Benson, Carrano, and Brusatte propose Neovenatoridae, a new clade of large-bodied allosauroids that persisted into the Late Cretaceous, explicitly including Australovenator wintonensis, Neovenator salerii, and Gondwanan taxa such as Megaraptor. The work also refers the Dinosaur Cove astragalus NMV P150070 to Megaraptoridae, integrating the oldest Australian record into the new clade. This is the allosauroid hypothesis competing with the tyrannosauroid hypothesis presented by Novas et al. (2013). Commercial article; figures replaced with open-access material from Hocknull 2009 and White 2013.

Comparative image: appendicular elements of the Australovenator holotype in Hocknull et al. (2009), used in analyses such as Benson et al. (2010).

Comparative image: Australovenator hindlimb in White et al. (2013), cited by subsequent analyses that resume the discussion initiated by Benson et al. (2010).

Poropat and colleagues describe new sauropod material from the Winton Formation and analyze the biogeography of Cretaceous Australian dinosaurs. For Australovenator wintonensis, the work is relevant because it updates the list of contemporary fauna, with titanosauriform sauropods such as Diamantinasaurus and Savannasaurus, and discusses how Australia, South America, and Antarctica maintained continental connections in the mid-Cretaceous, consistent with the distribution of Megaraptoridae. Article with open figures in Nature; here we use additional figures from Hocknull 2009 related to the same formation.

Comparative image: cervical vertebrae of Australovenator in Hocknull et al. (2009), contextualizing the Winton fauna revised by Poropat et al. (2016).

Comparative image: artistic reconstructions of the three Winton taxa in Hocknull et al. (2009): Australovenator, Diamantinasaurus, and Wintonotitan, making up the ecosystem analyzed by Poropat et al. (2016).

Figure 1: Map of Queensland, northeast Australia, showing the distribution of Cretaceous outcrop.

Figure 2: Winton Formation outcrop surrounding the town of Winton, with key localities marked.

Figure 3: Savannasaurus elliottorum gen. et sp. nov., holotype specimen AODF 660.

Figure 4: Savannasaurus elliottorum gen. et sp. nov., holotype specimen AODF 660.

Agnolin, Ezcurra, Pais, and Salisbury review Cretaceous non-avian dinosaur faunas from Australia and New Zealand and support strong Gondwanan affinities for the Australian record. Australovenator is treated within Megaraptora, reinforcing the link with South American taxa such as Megaraptor and Aerosteon. The article is commercial; images replaced with complementary material from Hocknull 2009.

Comparative image: cranial and postcranial elements of Australovenator in Hocknull et al. (2009), anatomical context for the biogeographic review of Agnolin et al. (2010).

Comparative image: additional anatomical details in Hocknull et al. (2009), references for the analysis of Gondwanan affinities presented by Agnolin et al. (2010).