Evolution of Hadrosaurs in the Campanian of Laramidia: New Information from the Skull Roof and Braincase DOI Open Access
Bradley McFeeters

Published: Jan. 1, 2022

This project seeks to investigate the morphology, ontogeny, and evolution of skull roof braincase characters in hadrosaurids from Campanian northern Laramidia (Alberta Montana), a setting which they have been historically recognized as having high abundance diversity. New material is evaluated clarify distribution informativeness morphological character states, allow further testing previous hypotheses about how ontogenetic development these evolved within clades, enable identification previously unrecorded taxa. Five partial skulls Maiasaura peeblesorum are described bone bed Two Medicine Formation Montana, providing basis for description morphology this taxon, an series allowing crest be compared related new middle unit Oldman at Milk River Ridge Reservoir near Warner, southern Alberta both represent first occurrences taxon that unit. The diagnostic occurrence Canada. Brachylophosaurus example co-occurring brachylophosaurins. second Parasaurolophini, oldest lambeosaurine Alberta. A phylogenetic analysis using maximum parsimony Bayesian methods supports identifications, also re-identifies specimen Dinosaur Park geologically youngest brachylophosaurin

Language: Английский

A new ootype of putative dromaeosaurid eggs from the Upper Cretaceous of southern China DOI
Rui Wu, Kecheng Niu,

Shukang Zhang

et al.

Cretaceous Research, Journal Year: 2024, Volume and Issue: 161, P. 105909 - 105909

Published: April 22, 2024

Language: Английский

Citations

4
New oospecies of Spheroolithidae from the Upper Cretaceous in the Laiyang Basin, Shandong Province, China DOI
Qing He, Shutong Li,

Hanghai Zheng

et al.

Cretaceous Research, Journal Year: 2024, Volume and Issue: 161, P. 105911 - 105911

Published: April 25, 2024

Language: Английский

Citations

1
The first hadrosauroid eggshell from the Aix-en-Provence Basin (late maastrichtian) of France DOI

Tom T.P. van der Linden,

Darla K. Zelenitsky, René H.B. Fraaije

et al.

Historical Biology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 8

Published: July 24, 2024

Nearly all dinosaur egg or oospecies occurrences from the Upper Cretaceous of France have been attributed to titanosaur dinosaurs. Here, we describe first occurrence probable hadrosauroid eggshells France, which assign a new oospecies, Paraspheroolithus porcarboris oosp. nov. (oofamily: Spheroolithidae), upper 'Argiles et Grès à Reptiles' Formation (upper Maastrichtian) Aix-en-Provence. differs other spheroolithid in following combination characteristics: prolatospherulitic morphotype, prolatocanaliculate pore system, prominent anastomosing ornamentation, medium eggshell thickness, less defined horizontal accretion lines and high density. The affinity places ootaxon outside oofamilies ascribed titanosaurs (i.e. Megaloolithidae Fusioolithidae), thus its discovery expands parataxonomic diversity this region formation. We suggest taxonomic Spheroolithidae is somewhat broader than Hadrosauroidea, potentially encompassing Ornithopoda. However, remains most plausible for based on absence ornithopod late Maastrichtian deposits Ibero-Armorican Island.

Language: Английский

Citations

1
The smallest known complete dinosaur fossil eggs from the Upper Cretaceous of South China DOI
Rui Wu,

Fasheng Lou,

Juan Yu

et al.

Historical Biology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 10

Published: Oct. 14, 2024

The Upper Cretaceous Ganzhou Basin of Jiangxi Province, South China is among one the richest egg fossil sites in world and yields abundant exquisite clutches embryonic eggs, especially oviraptorosaurs. Hadrosaurian, troodontid, potential dromaeosaurid fossils were also reported, though they rare. All these reported eggs vary morphology but have relatively large sizes. Here, we report a partial clutch with six complete small from Tangbian Formation City, Southeast China. microstructure eggshell indicates that it can be assigned to Ovaloolithidae. Hence, established new ootaxon, Minioolithus ganzhouensis oogen. et oosp. nov. based on unique combination characters, including size, irregular arrangement, worm-like nodular ornamentation, gradual boundary between two structural layers. support smallest known non-avian theropod up date. This discovery increases diversity dinosaur Late significant for our understanding evolution theropods Cretaceous.

Language: Английский

Citations

1
A New Titanosaurian Sauropod from the Upper Cretaceous of Jiangxi Province, Southern China DOI Creative Commons
Jinyou Mo,

Qiongyao Fu,

Yilun Yu

et al.

Historical Biology, Journal Year: 2023, Volume and Issue: unknown, P. 1 - 15

Published: Sept. 21, 2023

Jiangxititan ganzhouensis gen. et sp. nov. is a new titanosaurian sauropod recovered from the Upper Cretaceous (Maastrichtian) Nanxiong Formation of Jiangxi Province, southern China. It characterised by: (1) posterior cervical and anterior dorsal centra strongly compressed dorsoventrally; (2) accessory horizontal laminae present within pleurocoels; (3) neural arches low; (4) spines deeply bifurcated widely separated; (5) inverted ‘V’ lamina formed by left right medial spinoprezygapophyseal at margin bifid point in posteriormost anteriormost spines; (6) triangular fossa metapophysis, lateral margins (7) postzygapophyses vertebrae fan-shaped; (8) spinopostzygapophyseal vertebrae; (9) rib short gracil. Our phylogenetic analysis places deeply-nested titanosauriform clade Lognkosauria sympatric Gannansaurus much earlier-diverging lineage. This discovery thus demonstrates presence both early-diverging late-diverging sauropods Late Ganzhou dinosaur fauna.

Language: Английский

Citations

3
A probable ornithopod egg from a historic collection of dinosaur eggs recovered from the Upper Cretaceous of Liaoning Province, China DOI

Caizhi Shen,

Kohei Tanaka, Darla K. Zelenitsky

et al.

Historical Biology, Journal Year: 2023, Volume and Issue: 36(5), P. 981 - 991

Published: April 20, 2023

Since the first discovery of dinosaur eggs announced by American Museum Natural History (central Asiatic expeditions to Mongolia) in 1923, these fossils became widely recognised from Mesozoic strata Asia and elsewhere. In 1920s, actually before had been collected another part Asia, specifically Liaoning Province northeastern China. From 1921 late five were Cenomanian Quantou Formation during construction, thus represent an important historic collection as some earliest discovered Asia. Here, we describe one egg this assign it Paraspheroolithus irenensis, taxon that likely belonged hadrosaur dinosaurs. The is approximately 7 × 8 cm diameter, with eggshell displays typical spheroolithid microstructure just over a millimetre thickness. irenensis shown be most widespread oospecies China, our comparative work extends its geographic range has yielded at least three oospecies, indicating potential for diversity or related ornithopod species region time.

Language: Английский

Citations

2
Relict duck-billed dinosaurs survived into the last age of the dinosaurs in subantarctic Chile DOI Creative Commons
Jhonatan Alarcón-Muñoz, Alexander O. Vargas, Hans P. Püschel

et al.

bioRxiv (Cold Spring Harbor Laboratory), Journal Year: 2023, Volume and Issue: unknown

Published: March 6, 2023

Abstract In the dusk of dinosaur era, advanced duck-billed dinosaurs (Family Hadrosauridae) are thought to have outcompeted other herbivores, making ecosystems less diverse and more vulnerable Cretaceous-Paleogene asteroid impact. They were also among first terrestrial organisms disperse from North America into South America. Here, we present new species subantarctic dinosaur, CPAP 3054, early Maastrichtian age in Magallanes, Chile. Surprisingly, unlike duckbills further north Patagonia, 3054 is not an duckbill, but descends American forms that transitional Hadrosauridae, diverging shortly before origin this family. America, these replaced by hadrosaurids late Campanian. The survival a pre-hadrosaurid lineage suggests ancestors arrived earlier than hadrosaurids, reaching south mass extinction, where they avoided competition hadrosaurids. Additional note This work contains biological name. New names preprints considered available ICZN. To avoid ambiguity, name included preprint, holotype specimen number used as placeholder. Paratypes described preprint diagnosis.

Language: Английский

Citations

1
Calvarial suture interdigitation in hadrosaurids (Ornithischia: Ornithopoda): Perspectives through ontogeny and evolution DOI Creative Commons
Thomas W. Dudgeon, David C. Evans

Evolution & Development, Journal Year: 2023, Volume and Issue: 25(3), P. 209 - 225

Published: March 10, 2023

Lambeosaurine hadrosaurids exhibited extreme modifications to the skull, where premaxillae, nasals, and prefrontals were modified form their iconic supracranial crests. This morphology contrasts with sister group, Hadrosaurinae, which possessed plesiomorphic arrangement of bones. Although studies have discussed differences between lambeosaurine hadrosaurine skull ontogeny, there is little information detailing suture through ontogeny evolution. Suture particular interest due its correlation mechanical loading in extant vertebrates. We quantify contrast calvarial sutures iguanodontians ontogenetic series Corythosaurus Gryposaurus test whether evolution crests impacted skull. found that interdigitation (SI) increases hadrosaurids, although this increase more than Gryposaurus, overall complexity (i.e., shape) remained constant. Lambeosaurines also higher SI other iguanodontians, even crestless juveniles, suggesting increased sinuosity unrelated structural support crest. Hadrosaurines basal did not differ. Similarly, lambeosaurines complexly shaped hadrosaurines while latter two groups do Taken together, these results suggest are interdigitated shape These evolutionary patterns coincided crest evolution, corresponding facial skeleton altered distribution stress feeding.

Language: Английский

Citations

1
Cretaceous dinosaur and crocodylomorph egg records of the Sanshui Basin, Guangdong Province, southern China DOI Creative Commons
Lida Xing, Zisheng Guo, Rui Wu

et al.

Journal of Palaeogeography, Journal Year: 2023, Volume and Issue: 12(3), P. 401 - 418

Published: April 19, 2023

This paper describes newly discovered dinosaur and crocodylomorph egg fragments from the Upper Cretaceous Sanshui Dalangshan formations of Basin Guangdong Province, southern China. Despite absence macroscopic information, eggshell specimens can be identified to oofamilies Prismatoolithidae, Elongatoolithidae Krokolithidae, it is hypothesized that these three families eggs correspond troodontids, oviraptorids crocodiloids, respectively. Comparison with fossils Nanxiong Basin, Heyuan Ganzhou highlights similarity between assemblages those Basin. The found in enrich known faunal types research area facilitate further studies on diversity Late vertebrate

Language: Английский

Citations

1
2023 BMC Ecology and Evolution image competition: the winning images DOI Creative Commons
Jennifer Harman, Christy A. Hipsley, Luke M. Jacobus

et al.

BMC Ecology and Evolution, Journal Year: 2023, Volume and Issue: 23(1)

Published: Aug. 18, 2023

In 2023, researchers from around the world entered BMC Ecology and Evolution photography competition. As a result, we received spectacular collection of photographs that capture wonder nature, those looking to understand it glimpses into long lost worlds. This editorial celebrates winning images selected by Editor senior members journal's board.

Language: Английский

Citations

1