The first juvenile dromaeosaurid (Dinosauria: Theropoda) from Arctic Alaska

Autor: Dori L. Contreras, Ronald S. Tykoski, Peter P. Flaig, Paul J. McCarthy, Anthony R. Fiorillo, Alfio Alessandro Chiarenza
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Teeth
Physiology
Digestive Physiology
Prince Creek Formation
Social Sciences
010502 geochemistry & geophysics
01 natural sciences
Dinosaurs
Mathematical and Statistical Techniques
Medicine and Health Sciences
Psychology
Phylogeny
Archosauria
Data Management
Principal Component Analysis
Multidisciplinary
Saurischia
Cretaceous Period
Dentition
biology
Animal Behavior
Arctic Regions
Fossils
Statistics
Eukaryota
Prehistoric Animals
Phylogenetic Analysis
Geology
Biological Evolution
Nanuqsaurus
Phylogenetics
Theropoda
Physical Sciences
Mesozoic Era
Medicine
Anatomy
Troodon
Research Article
010506 paleontology
Computer and Information Sciences
Science
Vertebrate Paleontology
Zoology
Research and Analysis Methods
Dromaeosauridae
stomatognathic system
Animals
Evolutionary Systematics
Statistical Methods
Paleozoology
0105 earth and related environmental sciences
Taxonomy
Evolutionary Biology
Behavior
Osteology
Saurornitholestinae
Organisms
Biology and Life Sciences
Paleontology
Geologic Time
biology.organism_classification
stomatognathic diseases
Jaw
Multivariate Analysis
Earth Sciences
Animal Migration
Paleobiology
Tooth
Digestive System
Head
Alaska
Mathematics
Zdroj: PLoS ONE, Vol 15, Iss 7, p e0235078 (2020)
PLoS ONE
ISSN: 1932-6203
Popis: Compared to the osteological record of herbivorous dinosaurs from the Late Cretaceous Prince Creek Formation of northern Alaska, there are relatively fewer remains of theropods. The theropod record from this unit is mostly comprised of isolated teeth, and the only non-dental remains known can be attributed to the troodontid cf. Troodon and the tyrannosaurid Nanuqsaurus. Thus far, the presence of members of Dromaeosauridae has been limited to isolated teeth. Here we describe a symphyseal portion of a small dentary with two ziphodont teeth. Based on tooth shape, denticle morphology, and the position of the Meckelian groove, we attribute this partial dentary to a saurornitholestine dromaeosaurid. The fibrous bone surface, small size, and higher number of mesial denticles compared to distal ones point to a juvenile growth stage for this individual. Multivariate comparison of theropod teeth morphospace by means of principal component analysis reveals an overlap between this dentary and Saurornitholestinae dromaeosaurid morphospace, a result supported by phylogenetic analyses. This is the first confirmed non-dental fossil specimen from a member of Dromaeosauridae in the Arctic, expanding on the role of Beringia as a dispersal route for this clade between Asia and North America. Furthermore, the juvenile nature of this individual adds to a growing body of data that suggests Cretaceous Arctic dinosaurs of Alaska did not undergo long-distance migration, but rather they were year-round residents of these paleopolar latitudes.
Databáze: OpenAIRE
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