Jane Austen's Art of Rudeness

Parks, Edd Winfield

doi:10.3138/utq.20.4.381

Cited by 2 publications

(2 citation statements)

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“…In this tree, Hadrosauridae includes Hadrosaurus foulkii , Eotrachodon orientalis and Saurolophidae. Likewise, Saurolophidae ( sensu Prieto‐Márquez 2010) is defined as the most recent common ancestor of Lambeosaurus lambei Parks, 1923, and Saurolophus osborni Brown, 1913, and all of its descendants. Saurolophidae is divided into Saurolophinae and Lambeosaurinae.…”

Section: Methodsmentioning

confidence: 99%

The dentary of hadrosauroid dinosaurs: evolution through heterochrony

Söderblom,

Blanco,

Prieto‐Márquez

et al. 2023

Palaeontology

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The near‐global distribution of hadrosaurid dinosaurs during the Cretaceous has been attributed to mastication, a behaviour commonly recognized as a mammalian adaptation. Its occurrence in a non‐mammalian lineage should be accompanied by the evolution of several morphological modifications associated with food acquisition and processing. This study investigated morphological variation in the dentary, a major element of the hadrosauroid lower jaw. Eighty‐four hadrosauroid dentaries were subjected to geometric morphometric and statistical analyses to investigate their taxonomic, ontogenetic, and individual variation. Results suggest increased food acquisition and processing efficiency in saurolophids through a complex pattern of evolutionary and growth‐related changes. The edentulous region grew longer relative to dentary length, allowing for food acquisition specialization anteriorly and processing posteriorly, and became ventrally directed, possibly associated with foraging low‐growing vegetation, especially in younger individuals. The saurolophid coronoid process became anteriorly directed and relatively more elongate, with an expanded apex, increasing moment arm length, with muscles pulling the jaw more posteriorly, increasing mechanical advantage. During growth, all hadrosauroids underwent anteroposterior dental battery elongation by the addition of teeth, and edentulous region ventralization decreased. The dental battery became deeper in saurolophids by increasing the number of teeth per tooth family. The increased coronoid process anterior inclination and relative edentulous region elongation in saurolophids are hypothesized to have evolved through hypermorphosis and/or acceleration, peramorphic heterochronic processes; the development of an anteroposteriorly shorter but dorsoventrally taller saurolophid dentary, is probably due to post‐displacement in dental battery elongation and edentulous region decreased ventral orientation, a paedomorphic heterochronic process.

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Section: Methodsmentioning

confidence: 99%

The dentary of hadrosauroid dinosaurs: evolution through heterochrony

Söderblom,

Blanco,

Prieto‐Márquez

et al. 2023

Palaeontology

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“…In his work on lambeosaurine morphometrics, Dodson (1975a) found two morphs of Corythosaurus (originally C. casuarius and C. intermedius ), which he hypothesized to be most likely sexual dimorphs of a single species rather than separate species as had been previously supposed (Brown, 1914; Parks, 1923). This was supported based on a difference in allometric trajectories between the two morphs.…”

Section: The Morphometrics Of Nonavian Dinosaursmentioning

confidence: 96%

Dots on a screen: The past, present, and future of morphometrics in the study of nonavian dinosaurs

Hedrick

2023

The Anatomical Record

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Using morphometrics to study nonavian dinosaur fossils is a practice that predates the origin of the word “dinosaur.” By the 1970s, linear morphometrics had become established as a valuable tool for analyzing intra‐ and interspecific variation in nonavian dinosaurs. With the advent of more recent techniques such as geometric morphometrics and more advanced statistical approaches, morphometric analyses of nonavian dinosaurs have proliferated, granting unprecedented insight into many aspects of their biology and evolution. I outline the past, present, and future of morphometrics as applied to the study of nonavian dinosaurs zeroing in on five aspects of nonavian dinosaur paleobiology where morphometrics has been widely utilized to advance our knowledge: systematics, sexual dimorphism, locomotion, macroevolution, and trackways. Morphometric methods are especially susceptible to taphonomic distortion. As such, the impact of taphonomic distortion on original fossil shape is discussed as are current and future methods for quantifying and accounting for distortion with the goal of reducing the taphonomic noise to biological signal ratio. Finally, the future of morphometrics in nonavian dinosaur paleobiology is discussed as paleobiologists move into a “virtual paleobiology” framework, whereby digital renditions of fossils are captured via methods such as photogrammetry and computed tomography. These primary data form the basis for three‐dimensional (3D) geometric morphometric analyses along with a slew of other forms of analyses. These 3D specimen data form part of the extended specimen and help to democratize paleobiology, unlocking the specimen from the physical museum and making the specimen available to researchers across the world.

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Jane Austen's Art of Rudeness

Cited by 2 publications

References 0 publications

The dentary of hadrosauroid dinosaurs: evolution through heterochrony

The dentary of hadrosauroid dinosaurs: evolution through heterochrony

Dots on a screen: The past, present, and future of morphometrics in the study of nonavian dinosaurs

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