| 词条 | Callawayasaurus |
| 释义 |
| name = Callawayasaurus | fossil_range = Early Cretaceous, {{fossil_range|Aptian}} | image = Callawayasaurus colombiensis.JPG | image_caption = Skull of Callawayasaurus colombiensis displayed in the Paleontological Museum of Villa de Leyva | genus = Callawayasaurus | parent_authority = Carpenter, 1999 | authority = (Wells, 1962 [originally Alzadasaurus]) | species = colombiensis |synonyms =
}}Callawayasaurus is a genus of plesiosaur from the family Elasmosauridae. When the first Callawayasaurus fossil was first discovered by Samuel Paul Welles in 1962, it was described as Alzadasaurus colombiensis before being moved into its current genus by Kenneth Carpenter in 1999.[1] EtymologyCallawayasaurus is named in honor of the paleontologist Jack M. Callaway, editor of Ancient Marine Reptiles who, as Carpenter put it, "in his brief career as a vertebrate paleontologist, did much to improve our understanding of marine reptiles".[1] The familiar suffix, -saurus comes from the Greek sauros (σαυρος), meaning "lizard" or "reptile."[2]DescriptionThe first skull of Callawayasaurus to be found was 35 cm long,[3] while the animal as a whole grew up to 8 m long. The nares of Callawayasaurus are elongated and positioned over the maxilla, which has 3-5 teeth.[2] The neck contains 56 vertebrae which are relatively short compared to other elasmosaurids.[2] Callawayasaurus fossils have no pectoral bars; in common with other plesiosaurs such as Terminonatator. They also lack postaxial accessory facets.[4] Another nearly complete skeleton was found to be slightly more robust than the holotype specimen. This subtle change may indicate sexual dimorphism.[2] DistributionThe first Callawayasaurus remains were found in the Paja Formation near Leiva, Boyaca Colombia.[2] The species name for the type, "columbiensis", means "from Colombia."[2] Callawayasaurus are known from the Aptian faunal stage of the early Cretaceous period, which extended from 125 to 112 million years ago.[5]See also{{Portal|Paleontology|Prehistory of South America}}
References1. ^1 Carpenter, K. 1999. "Revision of North American elasmosaurs from the Cretaceous of the Western Interior". Paludicola 2(2):148-173. 2. ^1 2 3 4 5 {{cite web|url=http://www.ppne.co.uk/index.php?m=show&id=12604|title=ppne.co.uk entry on Callawayasaurus|accessdate=2008-03-06|deadurl=yes|archiveurl=https://web.archive.org/web/20110728102202/http://www.ppne.co.uk/index.php?m=show&id=12604|archivedate=2011-07-28|df=}} 3. ^{{cite web|url=http://www.oceansofkansas.com/plesiosaur.html|title= oceansofkansas.com entry on Callawayasaurus|accessdate=2008-03-08}} 4. ^Patrick S. Druckenmiller and Anthony P. Russell., "A new Elasmosaurid Plesiosaur (Reptilia: Sauropterygia) from the lower Cretaceous Clearwater Formation, Northeastern Alberta, Canada". Vertebrate Morphology Research Group, Department of Biological Sciences, University of Calgary 5. ^{{cite web |url=http://www.stratigraphy.org/geowhen/stages/Aptian.html |title=stratigraphy.org entry on Apitan stage |accessdate=2008-03-06 |archiveurl=https://web.archive.org/web/20080209174051/http://www.stratigraphy.org/geowhen/stages/Aptian.html |archivedate=2008-02-09 |deadurl=yes |df= }} External links
10 : Elasmosaurids|Early Cretaceous plesiosaurs|Early Cretaceous reptiles of South America|Plesiosaurs of South America|Cretaceous Colombia|Fossils of Colombia|Altiplano Cundiboyacense|Paja Formation|Fossil taxa described in 1999|Taxa named by Kenneth Carpenter |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。