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Michael W. Caldwell
University of Alberta
135Publications
32H-index
2,707Citations
Publications 135
Newest
Published in Scientific Reports 4.01
Annie Schmaltz Hsiou9
Estimated H-index: 9
(USP: University of São Paulo),
Randall L. Nydam9
Estimated H-index: 9
(Arizona College of Osteopathic Medicine)
+ -3 AuthorsCesar Leandro Schultz24
Estimated H-index: 24
(UFRGS: Universidade Federal do Rio Grande do Sul)
The early evolution of lepidosaurs is marked by an extremely scarce fossil record during the Triassic. Importantly, most Triassic lepidosaur specimens are represented by disarticulated individuals from high energy accretion deposits in Laurasia, thus greatly hampering our understanding of the initial stages of lepidosaur evolution. Here, we describe the fragmentary remains of an associated skull and mandible of Clevosaurus hadroprodon sp. nov., a new taxon of sphenodontian lepidosaur from the La...
Published on Feb 4, 2019in Scientific Reports 4.01
Fernando F. Garberoglio (CONICET: National Scientific and Technical Research Council), Raúl O. Gómez2
Estimated H-index: 2
(Facultad de Ciencias Exactas y Naturales)
+ 2 AuthorsSebastián Apesteguía18
Estimated H-index: 18
(CONICET: National Scientific and Technical Research Council)
Snakes are an extremely modified and long-lived clade of lizards that have either lost or highly altered many of the synapomorphies that would clearly link them to their closest sister-group among squamates. We focus here on one postcranial morphological complex, the intercentrum system which in most non-ophidian squamates is limited to the cervical and caudal regions. The Cervical Intercentrum System (CeIS) is composed of a single intercentral element that sometimes articulates with a ventral p...
Published on Jun 1, 2019in Cretaceous Research 2.12
Paulina Jiménez-Huidobro (University of Bonn), Rodrigo A. Otero11
Estimated H-index: 11
(University of Chile)
+ 1 AuthorsMichael W. Caldwell32
Estimated H-index: 32
(University of Bonn)
Abstract The reassessment of a lower jaw fragment of a mosasaur from the upper Maastrichtian of central Chile (Q.3105) indicates that the specimen does not belong to Plotosaurus , as previously suggested by Frey et al. (2016) . The specimen does not show the characteristics of Plotosaurus , such as the long projection anterior to the anteriormost tooth socket of the dentary, the ventrally positioned Meckelian canal, nor does it possess teeth with enamel coarsely striated at the base of the crown...
Published on Feb 4, 2019in Journal of Systematic Palaeontology 2.31
Fernando F. Garberoglio (CONICET: National Scientific and Technical Research Council), Raúl O. Gómez7
Estimated H-index: 7
(Facultad de Ciencias Exactas y Naturales)
+ 3 AuthorsGonzalo D. Veiga13
Estimated H-index: 13
(UNLP: National University of La Plata)
The limbed snake Najash rionegrina from the Cenomanian (early Late Cretaceous) of the La Buitrera Palaeontological Area (LBPA), northern Patagonia is a key taxon in any study of the origin and early evolution of snakes. The original concept of the taxon was based on the holotype and a number of referred specimens including an isolated partial skull; a conservative rebuttal argued this concept was too broad due to the lack of association between the holotype elements and the referred specimens. H...
Published in Royal Society Open Science 2.52
Catherine R. C. Strong (U of A: University of Alberta), Tiago R. Simões7
Estimated H-index: 7
(U of A: University of Alberta)
+ -3 AuthorsMichael R. Doschak17
Estimated H-index: 17
(U of A: University of Alberta)
Accurate knowledge of skeletal ontogeny in extant organisms is crucial in understanding important morpho-functional systems and in enabling inferences of the ontogenetic stage of fossil specimens. ...
Published on Mar 20, 2019in Zoological Journal of the Linnean Society 2.91
Aaron R. H. LeBlanc10
Estimated H-index: 10
(U of A: University of Alberta),
Sydney R Mohr (U of A: University of Alberta), Michael W. Caldwell32
Estimated H-index: 32
(U of A: University of Alberta)
Published on Jul 25, 2019
Michael W. Caldwell32
Estimated H-index: 32
(U of A: University of Alberta)
Published on May 19, 2019in Journal of Systematic Palaeontology 2.31
Paulina Jiménez-Huidobro5
Estimated H-index: 5
(U of A: University of Alberta),
Michael W. Caldwell32
Estimated H-index: 32
(U of A: University of Alberta)
+ 1 AuthorsTimon S. Bullard2
Estimated H-index: 2
(U of A: University of Alberta)
Mosasaurs assigned to the genus Tylosaurus have been reported from the North Atlantic Circle Basin, including the Western Interior Seaway in North America and Europe, from the Turonian of Chihuahua, Mexico, to the early Maastrichtian of Belgium. The youngest record of Tylosaurus in North America is from the middle Campanian of the Pierre Shale, South Dakota. Data obtained by examination of an almost complete skull and associated postcranial elements of a large tylosaurine mosasaur from the upper...
Published on Mar 27, 2019in Frontiers of Earth Science in China
Paulina Jiménez-Huidobro5
Estimated H-index: 5
(U of A: University of Alberta),
Michael W. Caldwell32
Estimated H-index: 32
(U of A: University of Alberta)
Tylosaurinae Williston, 1897, is reconstructed in most analyses as the sister group of the Plioplatecarpinae Dollo, 1884. The most distinctive characteristic of the group is an elongate edentulous rostrum on the premaxilla. Members of the tylosaurine subfamily are divided into two genera: Tylosaurus Marsh, 1872, and Taniwhasaurus Hector, 1874. When all arguably valid tylosaurine species are included in a single phylogenetic analysis, some clades are well supported, i.e., the clade formed by T. p...
Published on May 20, 2019in Journal of Vertebrate Paleontology 1.74
Michelle Campbell Mekarski (U of A: University of Alberta), Dražen Japundžić1
Estimated H-index: 1
(AMNH: American Museum of Natural History)
+ 1 AuthorsMichael W. Caldwell32
Estimated H-index: 32
(U of A: University of Alberta)
ABSTRACTA new genus and species of plesiopedal mosasauroid, Portunatasaurus krambergeri, from the Cenomanian–Turonian (Late Cretaceous) of Croatia is described. An articulated skeleton, representing an animal roughly a meter long was found in 2008 on the island of Dugi Otok. The specimen is articulated, in approximate life position, and is well represented from the anterior cervical series to the pelvis. Preserved elements include cervical and dorsal vertebrae, rib fragments, pelvic fragments, a...
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