Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico.
PeerJ. 2020; 8:e9251.P

Abstract

Three new chasmosaurines from the Kirtland Formation (~75.0-73.4 Ma), New Mexico, form morphological and stratigraphic intermediates between Pentaceratops (~74.7-75 Ma, Fruitland Formation, New Mexico) and Anchiceratops (~72-71 Ma, 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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Authors+Show Affiliations

Fowler DW

Badlands Dinosaur Museum, Dickinson Museum Center, Dickinson, ND, USA. Museum of the Rockies, Montana State University, Bozeman, MT, USA.

Freedman Fowler EA

Badlands Dinosaur Museum, Dickinson Museum Center, Dickinson, ND, USA. Museum of the Rockies, Montana State University, Bozeman, MT, USA. Department of Natural Sciences, Dickinson State University, Dickinson, ND, USA.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

32547873

Citation

Fowler, Denver W., and Elizabeth A. Freedman Fowler. "Transitional Evolutionary Forms in Chasmosaurine Ceratopsid Dinosaurs: Evidence From the Campanian of New Mexico." PeerJ, vol. 8, 2020, pp. e9251.

Fowler DW, Freedman Fowler EA. Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico. PeerJ. 2020;8:e9251.

Fowler, D. W., & Freedman Fowler, E. A. (2020). Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico. PeerJ, 8, e9251. https://doi.org/10.7717/peerj.9251

Fowler DW, Freedman Fowler EA. Transitional Evolutionary Forms in Chasmosaurine Ceratopsid Dinosaurs: Evidence From the Campanian of New Mexico. PeerJ. 2020;8:e9251. PubMed PMID: 32547873.

* Article titles in AMA citation format should be in sentence-case

TY - JOUR T1 - Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico. AU - Fowler,Denver W, AU - Freedman Fowler,Elizabeth A, Y1 - 2020/06/05/ PY - 2019/11/20/received PY - 2020/05/07/accepted PY - 2020/6/18/entrez PY - 2020/6/18/pubmed PY - 2020/6/18/medline KW - Anagenesis KW - Anchiceratops KW - Ceratopsidae KW - Chasmosaurinae KW - Cretaceous KW - Dinosaur KW - Diversity KW - Pentaceratops SP - e9251 EP - e9251 JF - PeerJ JO - PeerJ VL - 8 N2 - Three new chasmosaurines from the Kirtland Formation (~75.0-73.4 Ma), New Mexico, form morphological and stratigraphic intermediates between Pentaceratops (~74.7-75 Ma, Fruitland Formation, New Mexico) and Anchiceratops (~72-71 Ma, 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. SN - 2167-8359 UR - https://www.unboundmedicine.com/medline/citation/32547873/Transitional_evolutionary_forms_in_chasmosaurine_ceratopsid_dinosaurs:_evidence_from_the_Campanian_of_New_Mexico_ DB - PRIME DP - Unbound Medicine ER -

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Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico.PeerJ. 2020; 8:e9251.P