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Heterochronic truncation of odontogenesis in theropod dinosaurs provides insight into the macroevolution of avian beaks
Wang, Shuo1,2; Stiegler, Josef3; Wu, Ping4; Chuong, Cheng-Ming4; Hu, Dongyu5; Balanoff, Amy6; Zhou, Yachun7,8; Xu, Xing7
2017-10-10
Source PublicationPROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN0027-8424
Volume114Issue:41Pages:10930-10935
Abstract

Beaks are innovative structures characterizing numerous tetrapod lineages, including birds, but little is known about how developmental processes influenced the macroevolution of these important structures. Here we provide evidence of ontogenetic vestigialization of alveoli in two lineages of theropod dinosaurs and show that these are transitional phenotypes in the evolution of beaks. One of the smallest known caenagnathid oviraptorosaurs and a small specimen of the Early Cretaceous bird Sapeornis both possess shallow, empty vestiges of dentary alveoli. In both individuals, the system of vestiges connects via foramina with a dorsally closed canal homologous to alveoli. Similar morphologies are present in Limusaurus, a beaked theropod that becomes edentulous during ontogeny; and an analysis of neontological and paleontological evidence shows that ontogenetic reduction of the dentition is a relatively common phenomenon in vertebrate evolution. Based on these lines of evidence, we propose that progressively earlier postnatal and embryonic truncation of odontogenesis corresponds with expansion of rostral keratin associated with the caruncle, and these progenesis and peramorphosis heterochronies combine to drive the evolution of edentulous beaks in nonavian theropods and birds. Following initial apomorphic expansion of rostral keratinized epithelia in perinatal toothed theropods, beaks appear to inhibit odontogenesis as they grow postnatally, resulting in a sequence of common morphologies. This sequence is shifted earlier in development through phylogeny until dentition is absent at hatching, and odontogenesis is inhibited by beak formation in ovo.

KeywordOntogenetic Edentulism Beak Evolution Tooth Reduction Caenagnathidae Sapeornis
DOI10.1073/pnas.1708023114
Language英语
WOS KeywordAlligator-mississippiensis ; Evolution ; Teeth ; Oviraptorosauria ; Morphology ; Dentition ; China ; Acipenseriformes ; Toothlessness ; Characters
Funding ProjectNational Natural Science Foundation of China[41602013] ; National Natural Science Foundation of China[41688103] ; National Natural Science Foundation of China[41120124002] ; National Natural Science Foundation of China[41172026] ; Youth Innovative Research Team Project of Capital Normal University ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences[173125] ; U.S. National Science Foundation[NSF EAR 0310217] ; U.S. National Science Foundation[0228559] ; National Institutes of Health[AR47364] ; National Institutes of Health[AR60306] ; National Science Foundation[NSF DEB 1457181]
WOS Research AreaScience & Technology - Other Topics
WOS SubjectMultidisciplinary Sciences
WOS IDWOS:000412653900059
Funding OrganizationNational Natural Science Foundation of China ; Youth Innovative Research Team Project of Capital Normal University ; State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences ; U.S. National Science Foundation ; National Institutes of Health ; National Science Foundation
PublisherNATL ACAD SCIENCES
Citation statistics
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/18934
Collection中国科学院南京地质古生物研究所
Corresponding AuthorWang, Shuo
Affiliation1.Capital Normal Univ, Coll Life Sci, Lab Vertebrate Evolut, Beijing 100048, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, State Key Lab Palaeobiol & Stratig, Nanjing 210008, Jiangsu, Peoples R China
3.George Washington Univ, Dept Biol Sci, Washington, DC 20052 USA
4.Univ Southern Calif, Keck Sch Med, Dept Pathol, Los Angeles, CA 90033 USA
5.Shenyang Normal Univ, Key Lab Evolut Life Northeast Asia, Paleontol Museum Liaoning, Minist Land & Resources,Paleontol Inst, Shenyang 110034, Liaoning, Peoples R China
6.Johns Hopkins Univ, Ctr Funct Anat & Evolut, Baltimore, MD 21205 USA
7.Chinese Acad Sci, Inst Vertebrate Paleontol & Paleoanthropol, Key Lab Vertebrate Evolut & Human Origin, Beijing 100044, Peoples R China
8.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Corresponding Author AffilicationNanjing Institute of Geology and Palaeonotology,CAS
Recommended Citation
GB/T 7714
Wang, Shuo,Stiegler, Josef,Wu, Ping,et al. Heterochronic truncation of odontogenesis in theropod dinosaurs provides insight into the macroevolution of avian beaks[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2017,114(41):10930-10935.
APA Wang, Shuo.,Stiegler, Josef.,Wu, Ping.,Chuong, Cheng-Ming.,Hu, Dongyu.,...&Xu, Xing.(2017).Heterochronic truncation of odontogenesis in theropod dinosaurs provides insight into the macroevolution of avian beaks.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,114(41),10930-10935.
MLA Wang, Shuo,et al."Heterochronic truncation of odontogenesis in theropod dinosaurs provides insight into the macroevolution of avian beaks".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 114.41(2017):10930-10935.
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