Controversy Over Triceratops Identity Continues 14 December 2011

Controversy over Triceratops identity continues 14 December 2011 Despite their extinction millions of years ago, Triceratops continue to incite controversy. In the latest chapter, researchers present further evidence that three genera thought at one time or another to be distinct - Triceratops, Torosaurus, and Nedoceratops - actually represent different individuals that all belong to the Triceratops genus. The work, led by John Scannella of Montana State University and published in the Dec. 14 issue of the online journal PLoS ONE, focuses on one particular specimen - a single skull - that has been the subject of considerable debate. Some consider it a Triceratops, while others argue that it is a different genus. The new analysis provides evidence that this specimen is in fact a Triceratops, and that much of the confusion has arisen due to significant skeletal changes that are thought to occur during Triceratops development, as well as natural variation within the genus. These factors result in specimens with some features that are considerably different, but are nonetheless all Triceratops, the authors conclude. More information: Scannella JB, Horner JR (2011) 'Nedoceratops': An Example of a Transitional Morphology. PLoS ONE 6(12): e28705.doi:10.1371/journal.pone.0028705 Provided by Public Library of Science APA citation: Controversy over Triceratops identity continues (2011, December 14) retrieved 24 September 2021 from https://phys.org/news/2011-12-controversy-triceratops-identity.html This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. 1 / 1 Powered by TCPDF (www.tcpdf.org).

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A Neoceratopsian Dinosaur from the Early Cretaceous of Mongolia And
ARTICLE https://doi.org/10.1038/s42003-020-01222-7 OPEN A neoceratopsian dinosaur from the early Cretaceous of Mongolia and the early evolution of ceratopsia ✉ Congyu Yu 1 , Albert Prieto-Marquez2, Tsogtbaatar Chinzorig 3,4, Zorigt Badamkhatan4,5 & Mark Norell1 1234567890():,; Ceratopsia is a diverse dinosaur clade from the Middle Jurassic to Late Cretaceous with early diversification in East Asia. However, the phylogeny of basal ceratopsians remains unclear. Here we report a new basal neoceratopsian dinosaur Beg tse based on a partial skull from Baruunbayan, Ömnögovi aimag, Mongolia. Beg is diagnosed by a unique combination of primitive and derived characters including a primitively deep premaxilla with four pre- maxillary teeth, a trapezoidal antorbital fossa with a poorly delineated anterior margin, very short dentary with an expanded and shallow groove on lateral surface, the derived presence of a robust jugal having a foramen on its anteromedial surface, and five equally spaced tubercles on the lateral ridge of the surangular. This is to our knowledge the earliest known occurrence of basal neoceratopsian in Mongolia, where this group was previously only known from Late Cretaceous strata. Phylogenetic analysis indicates that it is sister to all other neoceratopsian dinosaurs. 1 Division of Vertebrate Paleontology, American Museum of Natural History, New York 10024, USA. 2 Institut Català de Paleontologia Miquel Crusafont, ICTA-ICP, Edifici Z, c/de les Columnes s/n Campus de la Universitat Autònoma de Barcelona, 08193 Cerdanyola del Vallès Sabadell, Barcelona, Spain. 3 Department of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA. 4 Institute of Paleontology, Mongolian Academy of Sciences, ✉ Ulaanbaatar 15160, Mongolia.
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__________The Paleontograph________ A newsletter for those interested in all aspects of Paleontology Volume 1 Issue 1 January, 2012 _________________________________________________________________ From Your Editor So, here we are at the beginning of something. I think that it would be good to tell you how this venture came about. I’ve edited The NJPS Paleontograph for sixteen years. NJPS, being the New Jersey Paleontological Society. Like many gem, mineral or fossil clubs, NJPS has started to fade away. There is a lack of members willing to step forward and do work for the group. It became a club that had a great newsletter but nothing else, no programs, field trips or activities. I grew tired of the situation and tried to get people to become more active but that was not to be, so I resigned. I don’t know what will happen to the club, some are trying to keep it going. But I enjoyed putting out the newsletter and felt proud of it. I was blessed with one main, very prolific, contributor, Bob Sheridan, who made me the envy of all other newsletter editors that knew my newsletter. Unlike other newsletter editors, I never had to write articles myself, in order to fill my newsletter. It turns out that Bob feels the same way I do about the whole thing. So that brings us to here, today. First, the name. I like it and so I did a spin off from the old name. Not quite stealing it but very close. If someone complains, maybe I’ll change it but for now this is it.
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TITLE Transitional Evolutionary Forms and Stratigraphic Trends in Chasmosaurine Ceratopsid Dinosaurs : Evidence from the Campanian of New Mexico
bioRxiv preprint doi: https://doi.org/10.1101/854794; this version posted November 25, 2019. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. TITLE Transitional evolutionary forms and stratigraphic trends in chasmosaurine ceratopsid dinosaurs : evidence from the Campanian of New Mexico Denver Warwick Fowler1,2 & Elizabeth Anne Freedman Fowler1,2,3 1 Badlands Dinosaur Museum, Dickinson, North Dakota. 58601 2 Museum of the Rockies and Dept. Earth Sciences, Montana State University, Bozeman, Montana, 59717, USA (where the majority of the research was conducted) 3 Dept. Natural Sciences, Dickinson State University, Dickinson, North Dakota, 58602 Corresponding Author: Denver Fowler Badlands Dinosaur Museum, Dickinson Museum Center, 188 East Museum Drive, Dickinson, ND 58601, USA Email Address: [email protected] ABSTRACT Three new chasmosaurines from the Kirtland Formation (~75.0 - 73.4 Ma), New Mexico, form morphological and stratigraphic intermediates between Pentaceratops (~74.7 - 75Ma, Fruitland Formation, New Mexico) and Anchiceratops (~72 - 71Ma, Horseshoe Canyon Formation, Alberta). The new specimens exhibit gradual enclosure of the parietal embayment that characterizes Pentaceratops, providing support for the phylogenetic hypothesis that Pentaceratops and Anchiceratops are closely related. This stepwise change of morphologic characters observed in chasmosaurine taxa that do not overlap stratigraphically is supportive of evolution by anagenesis. Recently published hypotheses that place Pentaceratops and Anchiceratops into separate clades are not supported. This phylogenetic relationship demonstrates unrestricted movement of large-bodied taxa between hitherto purported northern and southern provinces in the Late Campanian, weakening support for the hypothesis of extreme faunal provincialism in the Late Cretaceous Western Interior.
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