Pachypleurosaur

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Pachypleurosaurs
Temporal range: Triassic
Keichousaurus BW.jpg
Keichousaurus
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Superorder: Sauropterygia
Order: Nothosauroidea
Suborder: Pachypleurosauria
Nopcsa, 1928
Family: Pachypleurosauridae
Nopcsa, 1928
Genera

Anarosaurus
Dactylosaurus
Hanosaurus
Keichousaurus
Neusticosaurus
Odoiporosaurus
Pachypleurosaurus
Serpianosaurus

Pachypleurosaurs were primitive sauropterygian reptiles that vaguely resembled aquatic lizards, and were limited to the Triassic period. They were elongate animals, ranging in size from 20 cm to about a metre in length, with small heads, long necks, paddle-like limbs, and long deep tails. The limb girdles are greatly reduced, so it is unlikely these animals could move about on land. The widely spaced peg-like teeth project at the front of the jaws, indicate that these animals fed on fish.

Pachypleurosaurus edwardsi

Pachypleurosaurs were originally and are often still included among the Nothosaurs (Carroll 1988, Benton 2004). In some cladistic classifications however (Rieppel 2000), they are considered the sister group to the Eusauropterygia, the clade that includes the nothosaurs and plesiosaurs.

References[edit]

  • Benton, M. J. (2004), Vertebrate Paleontology, 3rd ed. Blackwell Science Ltd classification
  • Carroll, R.L. (1988), Vertebrate Paleontology and Evolution, WH Freeman & Co.
  • Rieppel, O., (2000), Sauropterygia I, placodontia, pachypleurosauria, nothosauroidea, pistosauroidea: In: Handbuch der Palaoherpetologie, part 12A, 134pp. Verlag Dr. Friedrich Pfeil Table of contents

External links[edit]