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A new dromaeosaurid (Dinosauria: Theropoda) from the Upper Cretaceous Wulansuhai Formation of Inner Mongolia, China
A number of cranial and dental features seen in L. exquisitus and T. mangas suggest that these two taxa are probably intermediate in systematic position between known basal and derived dromaeosaurids, and the discovery of Linheraptor exquis Titus is thus important for understanding the evolution of some salient feature seen in the derived dronaeosaurusids.
Mosaic evolution in an asymmetrically feathered troodontid dinosaur with transitional features
This report reports a new troodontid from the Lower Cretaceous Jehol Group of China that has anatomical features that are transitional between long-armed basal Troodontids and derived short-armed ones, shedding new light on troodonid character evolution and suggests that feather asymmetry was ancestral to Paraves.
Morphological Data Sets Fit a Common Mechanism Much More Poorly than DNA Sequences and Call Into Question the Mkv Model
The low levels of branch length correlation demonstrated for morphology suggest that the Mkv model is too unrealistic and inadequate for the analysis of most morphological data sets.
A monodactyl nonavian dinosaur and the complex evolution of the alvarezsauroid hand
The unexpected combination of features seen in the hand of Linhenykus points to a complex mosaic pattern of manual evolution in alvarezsauroids, with loss of the presumably vestigial outer digits being decoupled from change in the form of digit II.
Basal paravian functional anatomy illuminated by high-detail body outline
The quantitative body outline of a fossil paravian Anchiornis is reconstructed based on high-definition images of soft tissues revealed by laser-stimulated fluorescence, revealing patagia-bearing arms, drumstick-shaped legs and a slender tail, features that were probably widespread among paravians.
Osteology of a New Late Cretaceous Troodontid Specimen from Ukhaa Tolgod, Ömnögovi Aimag, Mongolia
ABSTRACT A new troodontid dinosaur, Almas ukhaa, from the Late Cretaceous deposits of the Djadokhta Formation at Ukhaa Tolgod, Mongolia, is described here. The holotype specimen (IGM 100/1323)
Shake a Tail Feather: The Evolution of the Theropod Tail into a Stiff Aerodynamic Surface
A quantitative morphological and functional analysis to reconstruct intervertebral joint stiffness in the tail along the theropod lineage to extant birds shows how the tail structure of non-avian theropods was mechanically appropriate for holding itself up against gravity and maintaining passive balance, but as dorsoventral and lateral joint stiffness decreased, the tail may have become more effective for dynamically maintaining balance.
3D Camouflage in an Ornithischian Dinosaur
Powered flight potential approached by wide range of close avian relatives but achieved selectively
The results suggest that the potential for powered flight originated three or more times from a broad range of ancestors already nearing this potential, providing a well-supported scenario for the origin of theropod flight to further explore.