A Jurassic ornithischian dinosaur from Siberia with both feathers and scales

Godefroit, Pascal; Sinitsa, Sofia M.; Dhouailly, Danielle; Bolotsky, Yuri L.; Sizov, Alexander V.; McNamara, Maria E.; Benton, Michael J.; Spagna, Paul

doi:10.1126/science.1253351

Cited by 137 publications

(158 citation statements)

References 43 publications

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“…In birds, these scales develop through inhibition of feather development, regulated by sonic hedgehog pathway. It is possible that similar process occurred in Kulindadromeus (Godefroit et al, 2014). Elongated integuments are also known in the Triassic reptile Longisquama and some authors considered them to be very important in the evolution of feathers, despite highly uncertain phylogenetic position of that taxon among diapsid reptiles (e.g.…”

Section: Fig 4 Evolution Of Sex Determination and Parity Mode In Mamentioning

confidence: 99%

“…The deep homology (i.e. homology of genes but not their phenotypic effects) has been hypothesized to play role also in the evolution of dinosaur integuments (Godefroit et al, 2014). Studying morphogenesis of skin integuments of other reptiles may shed more light on that subject.…”

Section: Fig 4 Evolution Of Sex Determination and Parity Mode In Mamentioning

confidence: 99%

“…They also provide information about the level of homology between similar structures (e.g. Buchwitz and Voigt 2012;Godefroit et al, 2014) and answer how unique are features observed in modern taxa . In this review we highlight some of the recent advances in the field of developmental palaeoherpetology.…”

Section: Introductionmentioning

confidence: 99%

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Integrating developmental biology and the fossil record of reptiles

Skawiński¹,

Tałanda²

2014

Int. J. Dev. Biol.

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Numerous new discoveries and new research techniques have influenced our understanding of reptile development from a palaeontological perspective. They suggest for example that transition from mineralized to leathery eggshells and from oviparity to viviparity appeared much more often in the evolution of reptiles than was previously thought. Most marine reptiles evolved from viviparous terrestrial ancestors and had probably genetic sex determination. Fossil forms often display developmental traits absent or rare among modern ones such as polydactyly, hyperphalangy, the presence of ribcage armour, reduction of head ornamentation during ontogeny, extreme modifications of vertebral count or a wide range of feather-like structures. Thus, they provide an empirical background for many morphogenetic considerations.

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Section: Fig 4 Evolution Of Sex Determination and Parity Mode In Mamentioning

confidence: 99%

Section: Fig 4 Evolution Of Sex Determination and Parity Mode In Mamentioning

confidence: 99%

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Integrating developmental biology and the fossil record of reptiles

Skawiński¹,

Tałanda²

2014

Int. J. Dev. Biol.

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“…The discovery of a complex integumentary covering in the ornithischian Kulindadromeus (Godefroit et al 2014), as well as the presence of other branched integumentary structures in the heterodontosaurid Tianyulong (Zheng et al 2009), has opened a debate on whether or not all dinosaurs may have been covered, at least in part, by these kinds of structures, including members of Sauropodomorpha. In this new hypothesis, should the feather-like integument seen in some members of Ornithischia and Theropoda actually be homologous, the origin of these features may then coincide with the origin of Ornithoscelida; there would be no evidence for, or reason to assume, the presence of such features in sauropodomorphs, saurischians, or any groups more basal to them, as has been discussed in previous hypotheses, nor would they be primitive for Dinosauria as a whole (see Barrett et al 2015).…”

Section: Origins Of Feathers?mentioning

confidence: 99%

A new hypothesis of dinosaur relationships and early dinosaur evolution

Baron

Norman

Barrett

2017

Nature

244

313

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Further discussion of the main phylogenetic analysesTrees were produced and analysed in TNT 1.5-beta (Goloboff et al. 2008). In total 74 taxa were scored for 457 characters. Using the new technology search function, with ratchet and drift set to their defaults (10 iterations and 10 cycles respectively) and with 100 random additional sequences, our data produced 93 MPTs of length 1734. Bremer supports were also calculated using TNT 1.5-beta.The following characters were treated as ordered: 24, 35, 39, 60, 68, 71, 117, 145, 167, 169, 174, 180, 197, 199, 206, 214, 215, 222, 251, 269, 272, 286, 289, 303, 305, 307, 313, 322, 333, 334, 338, 353, 360, 376, 378, 387, 393, 442, 446 Our characters were drawn and modified from a number of previous studies and supplemented with an additional 63 novel characters. The main sources of our characters were Gauthier (1986), Sereno (1991), Langer and Benton (2006), Yates (2007), Butler et al. (2008), , Nesbitt (2011) and Pol et al. (2011).Our investigations and analyses showed that a number of characters previously thought only to appear in theropods or sauropodomorphs (or both) can also found in a several ornithischian taxa and, conversely, a number of features traditionally associated with basal ornithischian taxa are also present in basal theropods and, in some instances, sauropodomorphs. Furthermore, many other characters that are more traditionally associated with only one or two dinosauriform groups were found to have a wider and/or more complex distribution than other studies have previously proposed, e.g. a mediolaterally oriented scar on the anterior face of the distal femur -present in Dromomeron (Nesbitt et al. 2009a), is also found in some herrerasaurids (PVSJ 373). We tried, as objectively as possible, to capture all these similarities, as well as notable differences, between the basal members of each of the major dinosaurian lineages using our newly composed set of characters.Critically, a large number of character states were found to be present in ornithischians and theropods only (see below). Additionally, a number of other character states were found that are present only in sauropodomorphs and herrerasaurids. Some previously proposed dinosaur synapomorphies were also found to be absent from a few important early dinosaur taxa. In most of these cases, our finds changed the optimisations of important characters within the tree, often leading to changes in the structure of the tree itself, as well as our interpretation of the basal dinosaur interrelationships that the distributions of these character states imply.A number of novel clades were recovered by our analysis. Of these, Ornithoscelida is the most strikingly different from previous systems of grouping and classification. A full list of synapomorphies for each of the major clades that we have recovered is given later in this Supplement (Section 3.4). A discussion of a few of the other important finds of our analysis follows here.A constraint tree was also produced in TNT 1.5-beta in order to test how man...

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“…The protofeathers of taxa such as Beipiaosaurus, Yutyrannus, and Dilong (as well as several other theropod and orntihischian dinosaurs not from the Jehol Biota [Rauhut et al 2012, Zelenitsky et al 2012, Godefroit et al 2014) are of much more robust dimensions and quill-like morphology than the down of chicks (Xu et al 1999(Xu et al , 2004(Xu et al , 2009a(Xu et al , 2009b(Xu et al , 2009c(Xu et al , 2012. As such, there are no data to support Feduccia's (2013) proposed correlations between the down of chicks and protofeathers.…”

Section: Anatomical and Evolutionary Misinterpretationsmentioning

confidence: 50%

Rhetoric vs. reality: A commentary on “Bird Origins Anew” by A. Feduccia

Smith

Chiappe

Clarke

et al. 2015

The Auk

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Birds are maniraptoran theropod dinosaurs. The evidence supporting the systematic position of Avialae as a derived clade within Dinosauria is voluminous and derived from multiple independent lines of evidence. In contrast, a paucity of selectively chosen data weakly support, at best, alternative proposals regarding the origin of birds and feathers. Opponents of the theory that birds are dinosaurs have frequently based their criticisms on unorthodox interpretations of paleontological data and misrepresentation of phylogenetic systematic methods. Moreover, arguments against the nested position of Avialae in Dinosauria have often conflated the logically distinct questions of avian origins, the evolution of flight, and the phylogenetic distribution of feathers. Motivated by a Perspectives article with numerous factual inaccuracies that recently appeared in The Auk, we provide a review of the full complement of facts pertaining to the avian origins debate and address the misplaced criticisms raised in that opinion paper. Keywords: evolution of flight, evolution of feathers, evolution of birds, Avialae, maniraptoran theropod dinosaurs, phylogenetic systematics Retórica vs. Realidad: Un comentario sobre ''Bird Origins Anew'' por A. Feduccia, Auk 130:1-12 RESUMEN Las aves son dinosaurios terópodos maniraptores. La evidencia que sustenta la posición sistemática de Avialae como un clado derivado dentro de Dinosauria es voluminosa y se deriva de múltiples líneas independientes de evidencia. En contraste, sólo escasos datos elegidos selectivamente sustentan débilmente propuestas alternativas sobre el origen de las aves y las plumas. Los opositores de la teoría de que las aves son dinosaurios frecuentemente han basado sus críticas en interpretaciones no ortodoxas de los datos paleontológicos y en la tergiversación de los métodos de la sistemática filogenética. Además, los argumentos en contra de la posición anidada de Avialae dentro de Dinosauria han confundido la distinción lógica de las preguntas sobre los orígenes de las aves, la evolución del vuelo y la distribución filogenética de las plumas. Motivados por un artículo de Perspectivas que apareció recientemente en The Auk con numerosas imprecisiones fácticas, presentamos una revisión del conjunto completo de hechos relacionados con el debate sobre el origen de la aves y abordamos las críticas equivocadas que se presentan en dicho artículo de opinión. Palabras clave: Avialae, dinosaurios terópodos maniraptores, evolución de las aves, evolución de las plumas, evolución del vuelo, sistemática filogenética Q 2015 American Ornithologists' Union.

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A Jurassic ornithischian dinosaur from Siberia with both feathers and scales

Cited by 137 publications

References 43 publications

Integrating developmental biology and the fossil record of reptiles

Integrating developmental biology and the fossil record of reptiles

A new hypothesis of dinosaur relationships and early dinosaur evolution

Rhetoric vs. reality: A commentary on “Bird Origins Anew” by A. Feduccia

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