The first oviraptorosaur (Dinosauria: Theropoda) bonebed: evidence of gregarious behaviour in a maniraptoran theropod

Funston, Gregory F.; Currie, Philip J.; Eberth, David A.; Ryan, Michael J.; Chinzorig, Tsogtbaatar; Badamgarav, Demchig; Longrich, Nicholas R.

doi:10.1038/srep35782

Cited by 34 publications

(32 citation statements)

References 43 publications

(63 reference statements)

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“…Toothed premaxillae with edentulous maxillae and dentaries characterize the basal oviraptorosaur Caudipteryx (Ji et al, 1998;Figure 28.5) whose teeth are restricted to the anterior portion of the premaxilla. Although premaxillary teeth were revealed to be present in an Avimimus specimen (Watabe et al, 2000), the premaxilla is edentulous in all specimens of this taxon (Funston et al, 2016;Tsuihiji et al, 2017;Funston personal comm. 2019).…”

Section: Partial and Complete Edentulismmentioning

confidence: 99%

The distribution of dental features in non-avian theropod dinosaurs: Taxonomic potential, degree of homoplasy, and major evolutionary trends

Hendrickx

Mateus

Araújo

et al. 2019

Palaeontol Electron

151

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Section: Partial and Complete Edentulismmentioning

confidence: 99%

The distribution of dental features in non-avian theropod dinosaurs: Taxonomic potential, degree of homoplasy, and major evolutionary trends

Hendrickx

Mateus

Araújo

et al. 2019

Palaeontol Electron

151

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“…;Vickers-Rich et al 2002;Makovicky et al 2004;Fowler et al 2011;Xu et al 2011;Currie et al 2016;Funston et al 2016;McFeeters et al 2016;Tsogtbaatar et al 2017). …”

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Differential locomotor and predatory strategies of Gondwanan and derived Laurasian dromaeosaurids (Dinosauria, Theropoda, Paraves): Inferences from morphometric and comparative anatomical studies

2020

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Tetrapod limbs morphology is a reliable proxy of locomotor capacities. Beyond this, other aspects of life habits, such as predation abilities, can also be relevant to determine main morphofunctional appendicular properties, which ultimately reflect a compromise between different factors of the biological role. Dromaeosauridae is a dinosaur clade belonging to Theropoda, a group of bipedal predators. Dromaeosaurids represent an interesting study case, in which the hindlimbs have been proposed to be involved in both locomotion and predation activity. A peculiar feature characterizing all dromaeosaurids is a modified second pedal digit, which is typically related to predation. This theropod group is closely related to birds and diversified during the Cretaceous Period, mainly in the Northern Hemisphere (Laurasia). However, a subclade of dromaeosaurids, the Unenlagiinae, was recently recognized for Gondwana.Nevertheless, there are morphological differences between derived Laurasian dromaeosaurids (eudromaeosaurs) and unenlagiines. Such differences are observed in the proportions between hindlimb bones and in the presence of a subarctometatarsalian condition in unenlagiines, which is mainly characterized by a proximally constricted metatarsal III. To evaluate the function of these divergent morphologies, we conducted morphometric analyses and comparisons of qualitative morphological aspects, encompassing unenlagiines, other dromaeosaurids, as well as taxa from other theropod groups, including extant birds. The former approach consisted of two phylogenetic principal component analyses, one based on the main measurements of the hindlimb, and the other focused on the lengths of the pedal phalanges. The first analysis drew the unenlagiines close to taxa with long tibiae, as well as long and slender metatarsi. Instead, eudromaeosaurs are closer to taxa with shorter tibiae, and shorter and wider metatarsi. The second analysis showed that eudromaeosaurs and unenlagiines have similar phalangeal proportions, including the elongation of distal phalanges. However, the shorter second phalanx of the pedal digit II of eudromaeosaurs could have increased the force generated by this digit, which was the main predatory tool of the autopodium. This, together with a shorter and wider metatarsus, and a marked hinge-like morphology of the articular surfaces of metatarsals | 773 GIANECHINI Et Al.

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“…Further, in these birds the foot is symmetrical since digit III is the more developed and the main weight bearer, with non-ginglymoid interphalangeal articular surfaces, whereas digits II and IV have a similar length to each other, are shorten than digit III and have more ginglymoid interphalangeal articular facets, indicating that they were under higher torsional efforts [9,[72][73]. Similar features are observed especially in Mesozoic theropod taxa considered with greater cursorial capabilities, much of them possessing long tibiae and metatarsi and an arctometatarsalian condition, such as ornithomimids, alvarezsaurids, caenagnathids, and Avimimus (e.g., [9,13,33,38,55,[74][75][76][77][78][79][80][81][82][83].…”

Section: Discussionmentioning

confidence: 76%

The locomotor and predatory habits of unenlagiines (Theropoda, Paraves): inferences based on morphometric studies and comparisons with Laurasian dromaeosaurids

Gianechini

Ercoli

Díaz‐Martínez

2019

Preprint

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Unenlagiinae is mostly recognized as a subclade of dromaeosaurids. They have the modified pedal digit II that characterize all dromeosaurids, which is typically related to predation.However, derived Laurasian dromaeosaurids (eudromaeosaurs) differ from unenlagiines in having a shorter metatarsus and pedal phalanx II-1, and more ginglymoid articular surfaces in metatarsals and pedal phalanges. Further, unenlagiines have a subarctometatarsal condition, which could have increased the mechanical efficiency during locomotion. All these discrepancies possibly reflect different locomotor and predatory habits. To evaluate this we conducted morphometric analyses and comparisons of qualitative morphological aspects. The former consisted in two phylogenetic principal component analyses, one of them based on lengths of femur, tibia and metatarsus, and width of metatarsus, and the other based on lengths of pedal phalanges. The data sampling covered several coelurosaurian and noncoelurosaurian taxa. The first analysis showed the unenlagiines close to taxa with long tibiae and long and slender metatarsi, which are features considered to provide high cursorial capacities. Instead, eudromaeosaurs are close to taxa with shorter tibiae and shorter and wider metatarsi, which can be considered with low cursorial capacities. The second analysis showed that eudromaeosaurs and unenlagiines have similar phalangeal proportions. Moreover, they share the elongation of distal phalanges, which is a feature related to the capacity of grasping.The shorter and wider metatarsus, more ginglymoid articular surfaces and a shorter pedal phalanx II-2 of eudromaeosaurs possibly allowed them to exert a greater gripping strength.Thus, they had the potential of hunting large prey. Instead, the longer and slender subarctometatarsus, lesser ginglymoid articular surfaces and a longer pedal phalanx II-2 of unenlagiines possibly gave to them greater cursorial capacities and the ability to hunt smaller and elusive prey on the ground. Thus, the different morphological evolutionary paths of dromaeosaurids lineages seem to indicate different locomotor and predatory specializations. on the anatomy of derived Laurasian taxa (i.e., Dromaeosaurinae + Velociraptorinae or Eudromaeosauria following some authors, e.g., [10][11]), such as Deinonychus, Velociraptor, Saurornitholestes, Achillobator and Dromaeosaurus, in which the phalanges are markedly modified with respect to the plesiomorphic theropod morphology. Regarding the digit II of unenlagiines, it is similarly modified, although there are some anatomic differences with the digit II of eudromaeosaurs.Moreover, the anatomical differences between unenlagiines and eudromaeosaurs are not limited to those in this pedal digit, but also in other parts of the hindlimb. Mainly, the metatarsus differs between the two groups, since in unenlagiines is generally observed a subarctometatarsal condition, as in microraptorine dromaeosaurids and some basal troodontids, whereas in eudromaeosaurs the metatarsus is more robust and it h...

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The first oviraptorosaur (Dinosauria: Theropoda) bonebed: evidence of gregarious behaviour in a maniraptoran theropod

Cited by 34 publications

References 43 publications

The distribution of dental features in non-avian theropod dinosaurs: Taxonomic potential, degree of homoplasy, and major evolutionary trends

The distribution of dental features in non-avian theropod dinosaurs: Taxonomic potential, degree of homoplasy, and major evolutionary trends

Differential locomotor and predatory strategies of Gondwanan and derived Laurasian dromaeosaurids (Dinosauria, Theropoda, Paraves): Inferences from morphometric and comparative anatomical studies

The locomotor and predatory habits of unenlagiines (Theropoda, Paraves): inferences based on morphometric studies and comparisons with Laurasian dromaeosaurids

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