Peteinosaurus

Peteinosaurus
Temporal range: Late Triassic, 221–203 Ma
[1]
Paratype MCSNB 3359
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Pterosauria
Family: Dimorphodontidae
Genus: Peteinosaurus
Wild, 1978
Species: P. zambellii
Binomial name
Peteinosaurus zambellii
Wild, 1978

Peteinosaurus (pronounced /pɛˌtaɪnəˈsɔrəs/[2][3] or /pɛˌtinəˈsɔrəs/[4]) was a prehistoric reptile genus belonging to the Pterosauria. It lived in the late Triassic period in the middle Norian (about 221-210 million years ago).

Contents

Name

The genus has been described by the German paleontologist Rupert Wild in 1978.[5] The type species is Peteinosaurus zambellii. The genus name is derived from Greek peteinos, "winged" and sauros, "lizard", the latter being used to indicate any saurian. The specific name, zambellii, honours Rocco Zambelli, the curator of the Bergamo natural history museum.

Specimens

Three fossils have been found near Cene, Italy.[6] The first fossil, the holotype MCSNB 2886, is fragmentary and disarticulated. The second, the articulated paratype MCSNB 3359, lacks any diagnostic features of Peteinosaurus and thus might be a different species. This paratype has a long tail (20 cm) made more stiff by long extensions of the vertebrae; this feature is common among pterosaurs of the Triassic. The third exemplar is MCSNB 3496, another fragmentary skeleton. All specimina are those of subadults and of none has the skull been preserved.

Like most pterosaurs, Peteinosaurus had bones that were strong but very light. Peteinosaurus is trimorphodontic, with three types of conical teeth. An insectivorous lifestyle has been attributed to Peteinosaurus.[6] The fifth toe of Peteinosaurus was long and clawless. Its joint allowed it to flex in a different plane than the other phalanges, an adaptation whose function is unknown.[6]

Phylogeny and classification

Peteinosaurus is one of the oldest-known pterosaurs, and at a mere sixty centimetres, had a tiny wingspan when compared to some later genera, such as Pteranodon whose wingspan exceeded twenty feet. Its wings were also proportionally smaller than those of later pterosaurs, as its wing length was only twice the length of the hindlimb.[6] All other known pterosaurs have wingspans at least three times the length of their hindlimbs.[6] It also had single cusped teeth that lacked the specialized heterodonty present in the other Italian Triassic pterosaur genus, Eudimorphodon.[6]

All these factors converge to hint that Peteinosaurus belongs to a group that possibly represents the most basal known pterosaurs: the Dimorphodontidae, to which it was assigned in 1988 by Robert L. Carroll.[7] The only other known member of that group is the later genus Dimorphodon, which lent its name to the family including both genera.[6] Later cladistic analyses however, have not shown a close connection between the two forms. Nevertheless the possible basal position of Peteinosaurus has been affirmed by Fabio Marco Dalla Vecchia who suggested that Preondactylus, according to David Unwin the most basal pterosaur, might be a subjective junior synonym of Peteinosaurus. A 2010 cladistic analysis by Brian Andres and colleagues placed Peteinosaurus in Lonchognatha which includes Eudimorphodon and Austriadactylus as more basal.[8]

References

  1. ^ Wellnhofer, P. (1991). "Summary of Triassic Pterosaurs." In: The Illustrated Encyclopedia of Pterosaurs. London, UK: Salamander Books Limited. Pg. 67. ISBN 0861015665.
  2. ^ Creisler, B. (2003). "Pterosauria Translation and Pronunciation Guide", Dinosauria On-Line.
  3. ^ Australian Broadcasting Corporation (1999). "Walking with Dinosaurs: Dino Fact File: Peteinosaurus".
  4. ^ Zimmerman, H. (2001). Beyond the dinosaurs!: Sky Dragons, Sea Monsters, Mega-Mammals, and Other Prehistoric Beasts. New York: Atheneum Books for Young Readers. Pg. 15. ISBN 0689841132.
  5. ^ Wild, R. (1978). "Die Flugsaurier (Reptilia, Pterosauria) aus der Oberen Trias von Cene bei Bergamo, Italien", Bolletino della Societa Paleontologica Italiana, 17 (2): 176-256.
  6. ^ a b c d e f g "Peteinosaurus." In: Cranfield, I. (ed.) (2000). The Illustrated Directory of Dinosaurs and Other Prehistoric Creatures. London: Salamander Books, Ltd. Pp. 282-283. ISBN 1840652411.
  7. ^ Carroll, R. L. (1988). Vertebrate Paleontology and Evolution. New York: W. H. Freeman and Company. ISBN 0716718227.
  8. ^ Andres, B., J. M. Clark, and X. Xu (2010). "A new rhamphorhynchid pterosaur from the Upper Jurassic of Xinjiang, China, and the phylogenetic relationships of basal pterosaurs", Journal of Vertebrate Paleontology 30 (1): 163-187.

Further reading