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Chroniosuchus - A Reptiliomorph of the Permian

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  • Neal Robbins
        This link has an illustration of Chroniosuchus. http://en.wikipedia.org/wiki/File:ChroniosuchusDB126.jpg     Chroniosuchus was a genus of
    Message 1 of 1 , Apr 20 10:49 AM
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          This link has an illustration of Chroniosuchus.
       
          Chroniosuchus was a genus of reptiliomorphs that lived during the Permian. The systematic paleontology of Chroniosuchus is:
       
      Reptiliomorpha Save-Soderbergh 1934
      Chroniosuchia Kuhn 1970
      Chroniosuchidae Vjuschkov 1957
      Chroniosuchus Vjuschkov 1957
      Chroniosuchus paradoxus Vjuschkov 1957
      C. licharevi Riabinin 1962
       
          Chroniosuchus had a length of about 1.5 m. (4.92 feet). Fossils of it have been found in the Sokolki subassemblage in Russia. They date to the Wuchiapingian interval (260 - 254 million years ago) of the Permian.
          This excerpt from Palaeos Vertebrates gives information about the Chronosuchian reptiliomorphs:
       
      Characters: Large, skull lengths up to 50 to 55 cm. Orbits face dorsoventrally. One pair of pre-orbital fenestrae between jugal, prefrontal, lacrymal, and maxillary. Squamosal contacts postorbital. Armor wide, scute wings overlap each other posteriorly. Intercentra vary from ring-shaped in young individuals to spherical in adults; the neural arch fusing with the centrum during ontogeny.
       
      Armor: As represented in Chroniosuchus, the scutes have very wide wings and cover practically the whole upper region of the trunk. The tail scutes are narrower, the last of which lack wings. A long smooth strip extends about a third of the whole wing length along the posterior dorsal edge and represents the overlap area for the next wing of the scute. This is shown in figure(b). The wings of the neighboring scutes overlap each other posterioranteriorly (the reverse to the bystrowianiid condition). The descending ventral process (processus ventralis - pv in the same figure) forms the middle part of the lock.
       
          Neal Robbins
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