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Michael W. Caldwell
University of Alberta
143Publications
32H-index
2,857Citations
Publications 147
Newest
#1Alessandro Palci (Flinders University)H-Index: 12
#2Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
Last.Michael S. Y. Lee (Flinders University)H-Index: 5
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#1Ilaria Paparella (U of A: University of Alberta)H-Index: 2
#2Aaron R. H. LeBlanc (U of A: University of Alberta)H-Index: 11
Last.Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
view all 4 authors...
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#1Annie Schmaltz Hsiou (USP: University of São Paulo)H-Index: 10
#2Randall L. Nydam (Arizona College of Osteopathic Medicine)H-Index: 9
Last.Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
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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...
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#1Fernando F. Garberoglio (CONICET: National Scientific and Technical Research Council)
#2Raúl O. Gómez (Facultad de Ciencias Exactas y Naturales)H-Index: 3
Last.Sebastián Apesteguía (CONICET: National Scientific and Technical Research Council)H-Index: 19
view all 5 authors...
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...
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#1Alexander W.A. Kellner (UFRJ: Federal University of Rio de Janeiro)H-Index: 25
#2Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
Last.Philip J. Currie (U of A: University of Alberta)H-Index: 52
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Despite being known from every continent, the geological record of pterosaurs, the first group of vertebrates to develop powered flight, is very uneven, with only a few deposits accounting for the vast majority of specimens and almost half of the taxonomic diversity. Among the regions that stand out for the greatest gaps of knowledge regarding these flying reptiles, is the Afro-Arabian continent, which has yielded only a small number of very fragmentary and incomplete materials. Here we fill par...
1 CitationsSource
#1Fernando F. Garberoglio (CONICET: National Scientific and Technical Research Council)
#2Sebastián Apesteguía (CONICET: National Scientific and Technical Research Council)H-Index: 19
Last.Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
view all 9 authors...
Snakes represent one of the most dramatic examples of the evolutionary versatility of the vertebrate body plan, including body elongation, limb loss, and skull kinesis. However, understanding the earliest steps toward the acquisition of these remarkable adaptations is hampered by the very limited fossil record of early snakes. Here, we shed light on the acquisition of the snake body plan using micro–computed tomography scans of the first three-dimensionally preserved skulls of the legged snake N...
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#1Paulina Jiménez-Huidobro (University of Bonn)
#2Rodrigo A. Otero (University of Chile)H-Index: 12
Last.Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
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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. in 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 a...
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#1Alessandro Palci (Flinders University)H-Index: 12
#2Mark N. Hutchinson (Flinders University)
Last.Michael S. Y. Lee (Flinders University)H-Index: 5
view all 5 authors...
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#1Michelle Campbell Mekarski (U of A: University of Alberta)H-Index: 1
#2Stephanie E. Pierce (Harvard University)H-Index: 15
Last.Michael W. Caldwell (U of A: University of Alberta)H-Index: 32
view all 3 authors...
Non-ophidian ophidiomorphs, colloquially referred to as ‘dolichosaurs,’ are small-bodied aquatic lizards that lived in shallow seaways, rivers, and reef environments during the Late Cretaceous. Preservational, geographic, and taphonomic biases in this group make trends in biodiversity difficult to assess. This is exemplified by the fact that the majority of the described species are monotypic and known only from single specimens, imparting very little information on morphological or spatial vari...
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#1Fernando F. Garberoglio (CONICET: National Scientific and Technical Research Council)
#2Raúl O. Gómez (Facultad de Ciencias Exactas y Naturales)H-Index: 8
Last.Gonzalo D. Veiga (UNLP: National University of La Plata)H-Index: 15
view all 6 authors...
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...
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