A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia

Yu, Congyu; Prieto-Márquez, Albert; Chinzorig, Tsogtbaatar; Zorigt, Badamkhatan; Norell, Mark A.

doi:10.1038/s42003-020-01222-7

Cited by 14 publications

(11 citation statements)

References 23 publications

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“… Subclade topologies reflect those of the primary reference phylogenies: Ankylosauria (Figure 11 of Arbour & Currie, 2016 ; Figure 5 of Rivera-Sylva et al, 2018a ), Hadrosauridae (Figure 25 of Prieto-Márquez et al, 2013 ; Figure 18 of Prieto-Márquez, Wagner & Lehman, 2020 ), Marginocephalia (Figure 27 of Schott & Evans, 2017 ; Figure 9 of Chiba et al, 2018 ; Figure 9a of Fowler & Freedman Fowler, 2020 ; Figure 10 of Morschhauser et al, 2019 ; Figure 4 of Yu et al, 2020 ), non-ankylosaur Thyreophora (Figure 16 of Han et al, 2018 ), non-cerapod Neornithischia (Figure 4 of Madzia, Boyd & Mazuch, 2018 ), non-genasaur Ornithischia (Figure 4 of Madzia, Boyd & Mazuch, 2018 ), non-hadrosaurid Ornithopoda (Figure 2.26 of Norman, 2014 ; Figure 4 of Madzia, Boyd & Mazuch, 2018 ; Figure 12 of Madzia, Jagt & Mulder, 2020 ). Abbreviations: Ch .…”

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 76%

“…Figure 10 of Morschhauser et al (2019) is treated here as the primary reference phylogeny. Additional reference phylogenies include Figure 16 of Han et al (2018) , Figure S1 of Knapp et al (2018) , Figure 1 of Dieudonné et al (2020) , Figure 3 of Yu et al (2020) , and Figure 4 of Yu et al (2020) .…”

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

“…Reference phylogeny. Figure 4 of Yu et al (2020) is treated here as the primary reference phylogeny. Additional reference phylogenies include Figure 14 of Mallon et al (2016) , Figure S1 of Knapp et al (2018) , Figure 9a of Fowler & Freedman Fowler (2020) , Figure 10 of Wilson, Ryan & Evans (2020) , and Figure 3 of Yu et al (2020) .…”

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

“…Figure 4 of Yu et al (2020) is treated here as the primary reference phylogeny. Additional reference phylogenies include Figure 14 of Mallon et al (2016) , Figure S1 of Knapp et al (2018) , Figure 9a of Fowler & Freedman Fowler (2020) , Figure 10 of Wilson, Ryan & Evans (2020) , and Figure 3 of Yu et al (2020) .…”

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

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The phylogenetic nomenclature of ornithischian dinosaurs

Madzia

Arbour

Boyd

et al. 2021

PeerJ

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Ornithischians form a large clade of globally distributed Mesozoic dinosaurs, and represent one of their three major radiations. Throughout their evolutionary history, exceeding 134 million years, ornithischians evolved considerable morphological disparity, expressed especially through the cranial and osteodermal features of their most distinguishable representatives. The nearly two-century-long research history on ornithischians has resulted in the recognition of numerous diverse lineages, many of which have been named. Following the formative publications establishing the theoretical foundation of phylogenetic nomenclature throughout the 1980s and 1990s, many of the proposed names of ornithischian clades were provided with phylogenetic definitions. Some of these definitions have proven useful and have not been changed, beyond the way they were formulated, since their introduction. Some names, however, have multiple definitions, making their application ambiguous. Recent implementation of the International Code of Phylogenetic Nomenclature (ICPN, or PhyloCode) offers the opportunity to explore the utility of previously proposed definitions of established taxon names. Since the Articles of the ICPN are not to be applied retroactively, all phylogenetic definitions published prior to its implementation remain informal (and ineffective) in the light of the Code. Here, we revise the nomenclature of ornithischian dinosaur clades; we revisit 76 preexisting ornithischian clade names, review their recent and historical use, and formally establish their phylogenetic definitions. Additionally, we introduce five new clade names: two for robustly supported clades of later-diverging hadrosaurids and ceratopsians, one uniting heterodontosaurids and genasaurs, and two for clades of nodosaurids. Our study marks a key step towards a formal phylogenetic nomenclature of ornithischian dinosaurs.

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Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 76%

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

Section: Phylogenetic Nomenclature Of Ornithischian Cladesmentioning

confidence: 99%

See 2 more Smart Citations

The phylogenetic nomenclature of ornithischian dinosaurs

Madzia

Arbour

Boyd

et al. 2021

PeerJ

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“…In this study, we calculated the information properties and run parsimony‐based phylogenetic analyses on character matrices from 6 different vertebrate groups: Ornithischia (Han et al, 2017), Ceratopsia (Yu et al, 2020), Diplodocidae (Tschopp & Mateus, 2017), multituberculata (Wang et al., 2019), Carnivoramorpha (Spaulding & Flynn, 2012), and lizards (Tschopp et al, 2018). We first quantified the information entropy of each character in six matrices.…”

Section: Methodsmentioning

confidence: 99%

Information in morphological characters

Jiangzuo

Tschopp

et al. 2021

Ecology and Evolution

Self Cite

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The construction of morphological character matrices is central to paleontological systematic study, which extracts paleontological information from fossils. Although the word information has been repeatedly mentioned in a wide array of paleontological systematic studies, its meaning has rarely been clarified nor specifically defined. It is important, however, to establish a standard to measure paleontological information because fossils are hardly complete, rendering the recognition of homologous and homoplastic structures difficult. Here, based on information theory, we show the deep connections between paleontological systematic study and communication system engineering. Information is defined as the decrease of uncertainty and it is the information in morphological characters that allows distinguishing operational taxonomic units (OTUs) and reconstructing evolutionary history. We propose that concepts in communication system engineering such as source coding and channel coding, correspond to the construction of diagnostic features and the entire character matrices in paleontological studies. The two coding strategies should be distinguished following typical communication system engineering, because they serve dual purposes. With character matrices from six different vertebrate groups, we analyzed their information properties including source entropy, mutual information, and channel capacity. Estimation of channel capacity shows character saturation of all matrices in transmitting paleontological information, indicating that, due to the presence of noise, oversampling characters not only increases the burden in character scoring, but also may decrease quality of matrices. We further test the use of information entropy, which measures how informative a variable is, as a character weighting criterion in parsimony‐based systematic studies. The results show high consistency with existing knowledge with both good resolution and interpretability.

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A new neoceratopsian (Ornithischia, Ceratopsia) from the Lower Cretaceous Ohyamashimo Formation (Albian), southwestern Japan

Tanaka,

Chiba,

Ikeda

et al. 2024

Papers in Palaeontology

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The herbivorous dinosaur clade Ceratopsia flourished in the northern hemisphere during the Late Jurassic to Late Cretaceous. Previous palaeobiogeographic studies have suggested that their initial diversification occurred in Asia, with early‐branching neoceratopsians extending their geographical range to North America sometime during the Barremian to Albian. However, the specific timing and mode of their dispersal from Asia to North America remains unknown. Here we describe a new, early‐branching neoceratopsian, Sasayamagnomus saegusai gen. et sp. nov., from the Albian Ohyamashimo Formation in southwestern Japan, representing the easternmost fossil record of ceratopsians in Asia. Sasayamagnomus exhibits three diagnostic features in the jugal, squamosal and coracoid, respectively, and also has a unique combination of characters in the lacrimal. Our phylogenetic analysis indicates that Sasayamagnomus forms a clade with Aquilops americanus, one of the earliest neoceratopsians from North America, followed by the sister taxon Auroraceratops rugosus from China. The present time‐calibrated phylogenetic tree indicates that the immigration of neoceratopsians from Asia to North America occurred during the latest Aptian or early Albian, refining the previously suggested timeframe. This aligns with fragmentary neoceratopsian fossil records from the Lower Cretaceous of North America and the initial formation of the Bering land bridge. Furthermore, the simultaneous occurrence of global warming (which enabled the development of extensive forests in the Arctic region) and the emergence of the Bering land bridge during the Aptian–Albian, probably played a crucial role in facilitating the immigration of neoceratopsians from Asia to North America.

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A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia

Cited by 14 publications

References 23 publications

The phylogenetic nomenclature of ornithischian dinosaurs

The phylogenetic nomenclature of ornithischian dinosaurs

Information in morphological characters

A new neoceratopsian (Ornithischia, Ceratopsia) from the Lower Cretaceous Ohyamashimo Formation (Albian), southwestern Japan

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