A large-sized basal ankylopollexian from East Asia, shedding light on early biogeographic history of Iguanodontia

Xu, Xing; Tan, Qi; Gao, Yanfang; Bao, Zhi-qiang; Yin, Zhan; Guo, Bin; Wang, Junyou; Tan, Lin; Zhang, Yuguang; Hai, Xing

doi:10.1016/j.scib.2018.03.016

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…Among cerapods, dorsoventrally deep dentaries are also present in basal neoceratopsians, such as Bagaceratops rozhdestvenskyi Osmolska, 1975 (Alifanov, 2003, fig. 3a) and Archaeoceratops oshimai Dong andAzuma, 1997 (You andDodson, 2003). The dorsoventrally high lateral dental parapet results from a deeply concave buccal ridge, a highly convex occlusal margin, and dorsally highset dentition (Figs.…”

Section: Specimenmentioning

confidence: 99%

“…The dentary crowns of Hypsilophodon foxii (NHMUK R2477) and Tenontosaurus tilletti (see Thomas, 2015) differ by having relatively vertical secondary ridges separated by channels, multiple unsupported lingulate marginal denticles, and a more strongly developed primary ridge. The crowns of dryomorphans (e.g., Bayannurosaurus perfectus Xu et al, 2018 [Xu et al, 2018, fig. 2], Camptosaurus dispar [YPM VP 1886], Dryosaurus altus Marsh, 1878 [YPM VP 1876], and other iguanodontians [Mantell, 1848; Fanti et al, 2016]), with the exception of K. coetzeei , differ from those of Q. intrepidus by having multiple lingulate marginal denticles on the apical crown margins, sparsely developed lingual apicobasal ridges on comparatively smooth mesial and distal paracingular fossae, and smooth labial crown surfaces.…”

Section: Systematic Paleontologymentioning

confidence: 99%

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New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision ofQantassaurus intrepidusRich and Vickers-Rich, 1999

et al. 2019

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The Flat Rocks locality in the Wonthaggi Formation (Strzelecki Group) of the Gippsland Basin, southeastern Australia, hosts fossils of a late Barremian vertebrate fauna that inhabited the ancient rift between Australia and Antarctica. Known from its dentary,Qantassaurus intrepidusRich and Vickers-Rich, 1999 has been the only dinosaur named from this locality. However, the plethora of vertebrate fossils collected from Flat Rocks suggests that further dinosaurs await discovery. From this locality, we name a new small-bodied ornithopod,Galleonosaurus dorisaen. gen. n. sp. from craniodental remains. Five ornithopodan genera are now named from Victoria.Galleonosaurus dorisaen. gen. n. sp. is known from five maxillae, from which the first description of jaw growth in an Australian dinosaur is provided. The holotype ofGalleonosaurus dorisaen. gen. n. sp. is the most complete dinosaur maxilla known from Victoria. Micro-CT imagery of the holotype reveals the complex internal anatomy of the neurovascular tract and antorbital fossa. We confirm thatQ. intrepidusis uniquely characterized by a deep foreshortened dentary. Two dentaries originally referred toQ. intrepidusare reassigned toQ.?intrepidusand a further maxilla is referred to cf.Atlascopcosaurus loadsiRich and Rich, 1989. A further ornithopod dentary morphotype is identified, more elongate than those ofQ. intrepidusandQ.?intrepidusand with three more tooth positions. This dentary might pertain toGalleonosaurus dorisaen. gen. n. sp. Phylogenetic analysis recovered Cretaceous Victorian and Argentinian nonstyracosternan ornithopods within the exclusively Gondwanan clade Elasmaria. However, the large-bodied taxonMuttaburrasaurus langdoniBartholomai and Molnar, 1981 is hypothesised as a basal iguanodontian with closer affinities to dryomorphans than to rhabdodontids.UUID:http://zoobank.org/4af87bb4-b687-42f3-9622-aa806a6b4116

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Section: Specimenmentioning

confidence: 99%

Section: Systematic Paleontologymentioning

confidence: 99%

New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision ofQantassaurus intrepidusRich and Vickers-Rich, 1999

et al. 2019

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“…More basal iguanodontians ( e.g. , Iguanocolossus ) arrive in North America no later than the Barremian ( McDonald et al, 2012 ; Xu et al, 2018 ) increasing the likelihood that hadrosauroids, and/or even their ancestors, the non-hadrosauroid iguanodontians, may have played a role in the decline in sauropod diversity.…”

Section: Introductionmentioning

confidence: 99%

Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Wyenberg-Henzler¹

2022

PeerJ

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Following the Late Jurassic, megaherbivore communities in North America undergo a dramatic turnover in faunal composition: sauropods decline to the point of becoming relatively minor components of ecosystems, stegosaurs become extinct, and hadrosaurids, ceratopsids and ankylosaurs rise in diversity and abundance. Although a variety of causes have been proposed to account for the dramatic decrease in sauropod diversity following the Late Jurassic and could have also been applicable to the disappearance of stegosaurs, the potential for competitive replacement of sauropods by hadrosauroids as an explanation has been previously dismissed due to morphological differences without further investigation. Using twelve ecomorphological correlates of the skull, this study provides a preliminary investigation into ecomorphospace occupation of major megaherbivore clades from the Late Jurassic through to the Late Cretaceous of North America and assess if morphological differences were enough to have potentially facilitated dietary niche partitioning between sauropods and iguanodontians and stegosaurs and ankylosaurs. Overlap in reconstructed ecomorphospace was observed between sauropods (particularly non-diplodocid sauropods) and iguanodontians, as would be expected if morphological differences were not enough to facilitate niche partitioning, contrary to original claims used to dismiss the competitive replacement hypothesis. Overlap was also observed between stegosaurs and ankylosaurs, particularly between Late Cretaceous ankylosaurs. Whether this overlap is reflective competitive replacement or opportunistic occupation of recently vacated niches will require further assessment as sampling of some clades prior to the Late Cretaceous is too poor to make a reliable assessment and several underlying assumptions necessary for competition to occur (e.g., resource limitation) still need investigation. Teasing out the cause(s) of the ‘sauropod decline’ and extinction of stegosaurs in North America following the Late Jurassic will require future research not only into the competitive exclusion hypothesis, but other hypotheses as well with better sampling from Early Cretaceous and Late Jurassic intervals.

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“…First six dimensions of phylogenetic information distance PCoA tree space, showing 2500 Bayesian trees (dots) and single most parsimonious tree (circles). Results from: bottom left, Russell and Dong (1993) ; top right, Xu et al (2018) . Structural features evident in higher dimensions are not apparent within the first two dimensions (top left corner), particularly with regard to stratigraphic congruence, which is strongly correlated with higher dimensions of tree space (bottom right).…”

Section: Resultsmentioning

confidence: 99%

“…1b and Smith (2021)). Similarity, 2D mappings ofRussell and Dong (1993) orXu et al (2018) tree spaces (Fig.5) contain no hint of the significant correlation with M R Smith 29 stratigraphic congruence that exists in higher dimensions. Strong clustering in the mapped RF space of trees fromFischer et al (…”

mentioning

confidence: 92%

Robust Analysis of Phylogenetic Tree Space

Smith

2021

Systematic Biology

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Phylogenetic analyses often produce large numbers of trees. Mapping trees’ distribution in ‘tree space’ can illuminate the behaviour and performance of search strategies, reveal distinct clusters of optimal trees, and expose differences between different data sources or phylogenetic methods – but the high-dimensional spaces defined by metric distances are necessarily distorted when represented in fewer dimensions. Here, I explore the consequences of this transformation in phylogenetic search results from 128 morphological datasets, using stratigraphic congruence – a complementary aspect of tree similarity – to evaluate the utility of low-dimensional mappings. I find that phylogenetic similarities between cladograms are most accurately depicted in tree spaces derived from information-theoretic tree distances or the quartet distance. Robinson–Foulds tree spaces exhibit prominent distortions and often fail to group trees according to phylogenetic similarity, whereas the strong influence of tree shape on the Kendall–Colijn distance makes its tree space unsuitable for many purposes. Distances mapped into two or even three dimensions often display little correspondence with true distances, which can lead to profound misrepresentation of clustering structure. Without explicit testing, one cannot be confident that a tree space mapping faithfully represents the true distribution of trees, nor that visually evident structure is valid. My recommendations for tree space validation and visualization are implemented in a new graphical user interface in the ‘TreeDist’ R package.

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A large-sized basal ankylopollexian from East Asia, shedding light on early biogeographic history of Iguanodontia

Cited by 10 publications

References 33 publications

New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision ofQantassaurus intrepidusRich and Vickers-Rich, 1999

New small-bodied ornithopods (Dinosauria, Neornithischia) from the Early Cretaceous Wonthaggi Formation (Strzelecki Group) of the Australian-Antarctic rift system, with revision ofQantassaurus intrepidusRich and Vickers-Rich, 1999

Ecomorphospace occupation of large herbivorous dinosaurs from Late Jurassic through to Late Cretaceous time in North America

Robust Analysis of Phylogenetic Tree Space

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