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Platecarpus tympaniticus (Squamata, Mosasauridae): osteology of an exceptionally preserved specimen and its insights into the acquisition of a streamlined body shape in mosasaurs

Konishi, Takuya; Lindgren, Johan LU ; Caldwell, Michael W. and Chiappe, Luis (2012) In Journal of Vertebrate Paleontology 32(6). p.1313-1327
Abstract
LACM 128319, which was collected in western Kansas, U. S. A., and is assignable to Platecarpus tympaniticus (Mosasauridae, Plioplatecarpinae), represents arguably one of the most exquisite mosasaur specimens known to date. Measuring 5.67 m from the tip of the snout to the end of the tail, it comprises an exceptionally well-articulated skeleton, accompanied by soft-tissue remains, such as skin impressions and tracheal cartilage. P. tympaniticus is one of the most numerously collected mosasaur taxa in North America, but as most specimens are fragmentary or reconstructed to various degrees, LACM 128319 provides a unique opportunity to document the taxon's osteology from a single skeleton. In this study, we first present a detailed... (More)
LACM 128319, which was collected in western Kansas, U. S. A., and is assignable to Platecarpus tympaniticus (Mosasauridae, Plioplatecarpinae), represents arguably one of the most exquisite mosasaur specimens known to date. Measuring 5.67 m from the tip of the snout to the end of the tail, it comprises an exceptionally well-articulated skeleton, accompanied by soft-tissue remains, such as skin impressions and tracheal cartilage. P. tympaniticus is one of the most numerously collected mosasaur taxa in North America, but as most specimens are fragmentary or reconstructed to various degrees, LACM 128319 provides a unique opportunity to document the taxon's osteology from a single skeleton. In this study, we first present a detailed osteological description of LACM 128319. Following this, we present an analysis of the evolution of a streamlined body shape in P. tympaniticus, specifically by comparing the length distribution of the dorsal ribs in relevant anguimorphan taxa. We conclude that both an anterior migration of the rib cage and an increasing regionalization within the dorsal vertebral series are key features contributing to formation of a streamlined body profile in P. tympaniticus, and probably in many other hydropedal members of mosasaurs. (Less)
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author
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type
Contribution to journal
publication status
published
subject
in
Journal of Vertebrate Paleontology
volume
32
issue
6
pages
1313 - 1327
publisher
Society of Vertebrate Paleontology
external identifiers
  • wos:000310590700008
  • scopus:84868532439
ISSN
0272-4634
DOI
10.1080/02724634.2012.699811
language
English
LU publication?
yes
id
3b8c127b-4750-4c45-b666-1ec2aee62a59 (old id 3283266)
date added to LUP
2012-12-20 12:35:19
date last changed
2017-01-01 05:58:50
@article{3b8c127b-4750-4c45-b666-1ec2aee62a59,
  abstract     = {LACM 128319, which was collected in western Kansas, U. S. A., and is assignable to Platecarpus tympaniticus (Mosasauridae, Plioplatecarpinae), represents arguably one of the most exquisite mosasaur specimens known to date. Measuring 5.67 m from the tip of the snout to the end of the tail, it comprises an exceptionally well-articulated skeleton, accompanied by soft-tissue remains, such as skin impressions and tracheal cartilage. P. tympaniticus is one of the most numerously collected mosasaur taxa in North America, but as most specimens are fragmentary or reconstructed to various degrees, LACM 128319 provides a unique opportunity to document the taxon's osteology from a single skeleton. In this study, we first present a detailed osteological description of LACM 128319. Following this, we present an analysis of the evolution of a streamlined body shape in P. tympaniticus, specifically by comparing the length distribution of the dorsal ribs in relevant anguimorphan taxa. We conclude that both an anterior migration of the rib cage and an increasing regionalization within the dorsal vertebral series are key features contributing to formation of a streamlined body profile in P. tympaniticus, and probably in many other hydropedal members of mosasaurs.},
  author       = {Konishi, Takuya and Lindgren, Johan and Caldwell, Michael W. and Chiappe, Luis},
  issn         = {0272-4634},
  language     = {eng},
  number       = {6},
  pages        = {1313--1327},
  publisher    = {Society of Vertebrate Paleontology},
  series       = {Journal of Vertebrate Paleontology},
  title        = {Platecarpus tympaniticus (Squamata, Mosasauridae): osteology of an exceptionally preserved specimen and its insights into the acquisition of a streamlined body shape in mosasaurs},
  url          = {http://dx.doi.org/10.1080/02724634.2012.699811},
  volume       = {32},
  year         = {2012},
}