New Specimens of<i>Anchiornis huxleyi</i>(Theropoda: Paraves) from the Late Jurassic of Northeastern China

Pei, Rui; Li, Quanguo; Meng, Qingjin; Norell, Mark A.; Gao, Ke‐Qin

doi:10.1206/0003-0090-411.1.1

Cited by 55 publications

(128 citation statements)

References 71 publications

(431 reference statements)

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“…2, 3). This is different from the condition in Anchiornis and Archaeopteryx in which the nasal process is straight (Pei et al, 2017). As in all described troodontids and some basal paravians, the internarial bar is dorsoventrally flattened as can be observed on the right premaxilla (Makovicky et al, 2003;Norell et al, 2009;Lü et al, 2010;Pei et al, 2017).…”

Section: Morphological Description Skull and Mandiblementioning

confidence: 58%

“…2, 3, 4). It is slightly anteroposteriorly elongate as in IGM 100/972 and IGM 100/974 , which is an intermediate condition between the relatively round maxillary fenestra seen in Sinovenator and Anchiornis Pei et al, 2017), and the significantly elongate maxillary fenestra of derived troodontids, such as Byronosaurus and Zanabazar (Makovicky et al, 2003;Norell et al, 2009). The maxillary fenestra is much smaller than the antorbital fenestra, around 10% of the area of the antorbital fenestra, as also found in derived troodontids (Makovicky et al, 2003;Norell et al, 2009).…”

Section: Morphological Description Skull and Mandiblementioning

confidence: 64%

“…The external naris is anteroposteriorly elongate, with the long axis more than twice that of the short dorsoventral axis. In this case, it is similar to Sinovenator, Byro nosaurus, and some basal avialans, such as Anchiornis Makovicky et al, 2003;Hu et al, 2009;Pei et al, 2017). In derived troodontids such as Saurornithoides and Zanaba zar, the external naris is anteroposteriorly shortened, regardless of the elongation of the rostrum (Barsbold, 1974;Norell et al, 2009).…”

Section: Morphological Description Skull and Mandiblementioning

confidence: 97%

“…In derived troodontids such as Saurornithoides and Zanaba zar, the external naris is anteroposteriorly shortened, regardless of the elongation of the rostrum (Barsbold, 1974;Norell et al, 2009). The size-comparable avialan Anchiornis and the dromaeosaurid Microraptor also have an elongated external naris (Pei et al, 2014(Pei et al, , 2017, but larger and derived dromaeosaurid taxa such as Velociraptor and Tsaagan have shorter external nares (Barsbold and Osmólska, 1999;Norell et al, 2006). The anterior margin of the external naris is located above the third premaxillary tooth in Almas ukhaa, which is common in nonavialan paravians (Pei et al, 2017).…”

Section: Morphological Description Skull and Mandiblementioning

confidence: 99%

“…The nasals overlap the frontals dorsally and the lacrimals attach posterolaterally to the nasals. The suture area (the region occupied by the W-shaped suture) is anteroposteriorly short in basal paravians such as Anchiornis and Archaeopteryx (Mayr et al, 2005;Pei et al, 2017). However, this region is anteroposteriorly elongate in the derived troodontid Zanabazar and Almas ukhaa, as well as some dromaeosaurids, such as Velociraptor (Osborn, 1924;Norell et al, 2009).…”

Section: Morphological Description Skull and Mandiblementioning

confidence: 99%

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Osteology of a New Late Cretaceous Troodontid Specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia

Pei

Norell

Barta

et al. 2017

American Museum Novitates

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A new troodontid dinosaur, Almas ukhaa, from the Late Cretaceous deposits of the Djadokhta Formation at Ukhaa Tolgod, Mongolia, is described here. The holotype specimen (IGM 100/1323) comprises an almost complete and articulated cranium and partial articulated postcranial skeleton. This specimen has a small body size and a short snout as in basal paravians, but it exhibits a number of derived troodontid features that differentiate Almas ukhaa from the Early Cretaceous troodontids reported from China and unite this new taxon with other Late Cretaceous troodontids. Relative to other troodontids, Almas ukhaa is autapomorphic in the presence of a posteriorly curved pterygoid flange, absence of a lateral groove on the anterior part of the dentary, presence of a distinct spikelike process on the ischium, and elongate chevrons. The eggshell associated with IGM 100/1323 can be assigned to Prismatoolithidae indet. based on the smooth surface, eggshell thickness, and microstructural characteristics, and also preserves attributes similar to Protoceratopsidovum minimum. A unique relationship between Byronosaurus and the perinate troodontids IGM 100/972 and IGM 100/974 is no longer supported based on the new observations of Almas ukhaa and Gobivenator.

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Section: Morphological Description Skull and Mandiblementioning

confidence: 58%

Section: Morphological Description Skull and Mandiblementioning

confidence: 64%

Section: Morphological Description Skull and Mandiblementioning

confidence: 97%

Section: Morphological Description Skull and Mandiblementioning

confidence: 99%

Section: Morphological Description Skull and Mandiblementioning

confidence: 99%

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Osteology of a New Late Cretaceous Troodontid Specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia

Pei

Norell

Barta

et al. 2017

American Museum Novitates

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Osteology ofUnenlagia comahuensis(Theropoda, Paraves, Unenlagiidae) from the Late Cretaceous of Patagonia

Novas

Agnolín

Motta

et al. 2021

The Anatomical Record

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Unenlagia comahuensis was originally described as a phylogenetic link between nonavian dinosaurs and birds. Later it was interpreted by some authors as belonging to the deinonychosaurian clade Dromaeosauridae, and more recently as phylogenetically closer to birds than to dromaeosaurids. The only known specimen is represented by an incomplete skeleton, including vertebrae, incomplete scapular girdle, pelvis, and limbs, coming from Upper Cretaceous beds of Neuquén province, Patagonia, Argentina. The aim of the

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A new unenlagiine (Theropoda, Dromaeosauridae) from the Upper Cretaceous of Brazil

Brum

Pêgas

Bandeira

et al. 2021

Papers in Palaeontology

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The record of unenlagiines in Brazil, except for one dorsal vertebra, is still under debate based on isolated teeth. Here, we describe Ypupiara lopai gen. et sp. nov., the first dromaeosaurid species from Brazil, from the Maastrichtian of the Bauru Group, Paran a Basin. The specimen consists of a partial right maxilla (with three teeth in loci) and a right dentary. Ypupiara is characterized by a restricted number of neurovascular foramina on the lateral surface of the maxilla, a rectangular and anteroposteriorly expanded interdental plate, and a labiolingual compression of the teeth, which have a labiolingual diameter more than 3/5 of the rostrocaudal diameter. Our phylogenetic analysis recovers Ypupiara as an unenlagiine based on the fluted teeth and places it as the sister taxon of Austroraptor due to the ratio of the labiolingual and mesiodistal diameters of the teeth being more than 3/5. We also erect the new group Unenlagiinia, which includes Unenlagiinae and Halszkaraptorinae. Ypupiara nests within Unenlagiinia based on the widely spaced teeth and the lack of mesial and distal carinae in the maxillary teeth. The morphology of the teeth is similar to Buitreraptor, although the proportions are markedly distinct. The teeth and comparisons with other Unenlagiinia also support fish being part of the diet for Ypupiara. We also performed a parsimony analysis of endemicity, which suggested that the presence of unenlagiines in Brazilian Upper Cretaceous outcrops is explained by dispersion or extinction events. The new species provides new information on the evolution of Gondwanan dromaeosaurids, and its preserved teeth provide new data to enable the assignment of isolated dromaeosaurid teeth from the Bauru Group.

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New Specimens ofAnchiornis huxleyi(Theropoda: Paraves) from the Late Jurassic of Northeastern China

Cited by 55 publications

References 71 publications

Osteology of a New Late Cretaceous Troodontid Specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia

Osteology of a New Late Cretaceous Troodontid Specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia

Osteology ofUnenlagia comahuensis(Theropoda, Paraves, Unenlagiidae) from the Late Cretaceous of Patagonia

A new unenlagiine (Theropoda, Dromaeosauridae) from the Upper Cretaceous of Brazil

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