Results 41 to 50 of about 282 (138)
Ontogenetic stages of ceratopsian dinosaur Psittacosaurus in bone histology [PDF]
Acta Palaeontologica Polonica, 2019 The early ceratopsians Psittacosaurus and Protoceratops have provided important information on dinosaurian development because of abundant specimens of adults, subadults, juveniles, and even hatchlings.
Qi Zhao +3 more
doaj +1 more source
Osteohistology on Liaoceratops yanzigouensis (Dinosauria: Neoceratopsia) from the Early Cretaceous Jehol Biota [PDF]
古脊椎动物学报 (中英文版)Ceratopsia is among the most extensively studied groups of dinosaurs. However, research on ceratopsian osteohistology remains extremely limited, leaving significant gaps in our understanding of their growth rates, growth patterns, and life histories ...
GUO Te, HE Yi-Ming, ZHAO Qi
doaj +1 more source
, 2019 Basal neoceratopsians are a relatively diverse group of small- to medium-sized herbivorous dinosaurs from the Early to Late Cretaceous of Asia and North America.
Eric M. Morschhauser (132146) +3 more
core +1 more source
Limb-Bone Scaling Indicates Diverse Stance and Gait in Quadrupedal Ornithischian Dinosaurs [PDF]
, 2012 Background The most primitive ornithischian dinosaurs were small bipeds, but quadrupedality evolved three times independently in the clade. The transition to quadrupedality from bipedal ancestors is rare in the history of terrestrial vertebrate ...
Maidment, SC +4 more
core +1 more source
Palaeontology, Volume 68, Issue 4, July/August 2025.Abstract Ornithopoda is one of the three main ornithischian dinosaur clades in which secondary quadrupedality is represented. However, when it evolved from obligate bipedality remains controversial. Indeed, the ability to alternate between the two habits was inferred in some ornithopods based on ichnological observations and a mosaic of bipedal and ...
Romain Pintore +2 more
wiley +1 more source
The phylogenetic position of the ornithischian dinosaur Stenopelix valdensis from the Lower Cretaceous of Germany and the early fossil record of Pachycephalosauria [PDF]
, 2009 The holotype of Stenopelix valdensis is the most completely known dinosaur specimen from the “Wealden” (Lower Cretaceous) of northwestern Germany, but its phylogenetic position has remained highly controversial.
Butler, R J +2 more
core +1 more source
The Anatomical Record, Volume 307, Issue 12, Page 3717-3781, December 2024.Abstract Thescelosaurines are a group of early diverging, ornithischian dinosaurs notable for their conservative bauplans and mosaic of primitive features. Although abundant within the latest Cretaceous ecosystems of North America, their record is poor to absent in earlier assemblages, leaving a large gap in our understanding of their evolution ...
Haviv M. Avrahami +3 more
wiley +1 more source
, 2015 Yinlong downsi, from the Upper Jurassic Shishugou Formation, Xinjiang, northwestern China, is the oldest known ceratopsian dinosaur. Here we provide a detailed description of the skull and mandible based on the holotype, three partial skulls, and ...
Catherine A. Forster (241348) +3 more
core +1 more source
Was dinosaurian physiology inherited by birds? [PDF]
, 2009 Archaeopteryx is the oldest and most primitive known bird (Avialae). It is believed that the growth and energetic physiology of basalmost birds such as Archaeopteryx were inherited in their entirety from non-avialan dinosaurs.
Erickson Gregory M. +25 more
core +2 more sources
Journal of Comparative Neurology, Volume 532, Issue 3, March 2024.Illustration of the endocranial doming, which can provide a proxy for the brain‐to‐endocranial cavity index, using the endocast of an adult of the iguanodont dinosaur Proa valdearinnoensis as an example. Abstract Although the brain fills nearly the entire cranial cavity in birds, it can occupy a small portion of it in crocodilians.
Fabien Knoll +2 more
wiley +1 more source