2017
DOI: 10.1073/pnas.1708023114
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Heterochronic truncation of odontogenesis in theropod dinosaurs provides insight into the macroevolution of avian beaks

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 both possess shallow, … Show more

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Cited by 51 publications
(63 citation statements)
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“…The histology of the lingual and lateral occlusal ridges is incompatible with Wang et al's (2017Wang et al's ( , 2018 hypothesis that they represent vestiges of tooth-bearing structures. In tetrapods with thecodont implantation, including dinosaurs, interdental septa and plates are remnants of multiple generations of alveolar bone and other dental tissues that accumulate passively during tooth migration (LeBlanc et al, 2017a(LeBlanc et al, , 2017b.…”
Section: Ontogenetic Edentulismmentioning
confidence: 88%
“…The histology of the lingual and lateral occlusal ridges is incompatible with Wang et al's (2017Wang et al's ( , 2018 hypothesis that they represent vestiges of tooth-bearing structures. In tetrapods with thecodont implantation, including dinosaurs, interdental septa and plates are remnants of multiple generations of alveolar bone and other dental tissues that accumulate passively during tooth migration (LeBlanc et al, 2017a(LeBlanc et al, , 2017b.…”
Section: Ontogenetic Edentulismmentioning
confidence: 88%
“…Combining evidence from fossils and experimental developmental biology revealed the genetic regulation of edentulism in modern birds and provided a potential genetic mechanism for its evolution [6,7]. A developmental explanation for the origin of edentulism was further supported by three very recent studies based on fossils: one on the Jurassic ceratosaurian theropod Limusaurus [10] and the other two on a caenagnathid oviraptorosaur [11,12] and the Early Cretaceous bird Sapeornis [11]. Limusaurus gradually lost teeth with age, indicating that its edentulism evolved through a shift toward earlier cessation of tooth replacement, which can be explained by heterochrony, specifically progenesis (figure 2) [10].…”
Section: Developmental Evidence From Genetics and Fossilsmentioning
confidence: 90%
“…In the past, dinosaur incubation periods were estimated using bird models as 45 to 82 days, but Erickson et al [14] now provide direct evidence to the contrary. This (2) ontogenetic edentulism such as in Limusaurus [9], Sapeornis [10], and a caenagnathid dinosaur [10][11] (3) edentulism due to truncation at the cessation of tooth development rsbl.royalsocietypublishing.org Biol. Lett.…”
Section: Incubation Period As a Selective Factor For Edentulismmentioning
confidence: 99%
“…Wang et al (2017a) also point out to heterochronic mechanisms for the retardation and eventual truncation of tooth development, as exemplified by Limusaurus. In a follow-up paper, Wang et al (2017b) provide evidence for the hypothesis of vestigialization of alveoli as part of a process towards edentulism. Caenagnathid oviraptorosaurs and the Cretaceous bird genus Sapeornis show a system of vestiges that connects via foramina with a dorsally closed canal homologous to alveoli, which exemplifies an evolutionary stage more advanced than that in Limusaurus.…”
Section: Partial and Complete Edentulismmentioning
confidence: 95%
“…Functional morphology. Tooth loss and edentulism in theropods have been recently investigated by Zhou and Li (2009), Davit-Béal et al (2009), Louchart and Viriot (2011), Zanno and Makovicky (2011), Lautenschlager et al (2013), Meredith et al (2014), Bhullar et al (2016), Wang et al (2017b), Erickson et al (2017) and Yang and Sander (2018). The classical reasons for the origin of edentulism are related to developmental economy and for food acquisition.…”
Section: Partial and Complete Edentulismmentioning
confidence: 99%