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Phthinosuchia


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Phthinosuchia is an extinct group of therapsids including two poorly known species, Phthinosuchus discors and Phthinosaurus borrisiaki, from the Middle Permian of Russia Phthinthosuchus is known a partial crushed skull and Phthinosaurus is known from an isolated lower jaw[1] The two species have traditionally been grouped together based on their shared primitive characteristics, but more recent studies have proposed that they are more distantly related Phthinosuchus is either a carnivorous gorgonopsian relative[2] or an anteosaurian dinocephalian while Phthinosaurus is either a herbivorous rhopalodont dinocephalian[2][3] or a therocephalian[4]

Phthinosuchia was named by American paleontologist Everett C Olson in 1961, who considered it the most primitive infraorder within Therapsida A year later Olson named the new infraorder Eotheriodontia and reclassified Phthinosuchia as a subgroup of eotheriodonts, along with the families Biarmosuchidae and Brithopodidae Each species has been placed in its own family; Phthinosuchidae was named by Soviet paleontologist Ivan Yefremov in 1954 for both Phthinthosuchus and Phthinosaurus, while Phthinosauridae was named by Leonid Tatarinov in 1974 for Phthinosaurus alone[5]

References

  1. ^ Kazlev, A; White, T 14 November 2009 "Therapsida: Phthinosuchidae" Palaeoscom Retrieved 25 November 2012 
  2. ^ a b Kemp, TS 2011 "The origin and radiation of therapsids" In Chinsamy-Turan, A ed Forerunners of Mammals Bloomington: Indiana University Press pp 3–30 ISBN 0-253-35697-0 CS1 maint: Uses editors parameter link
  3. ^ Ivakhnenko, M F 2008 "Cranial morphology and evolution of Permian Dinomorpha Eotherapsida of eastern Europe" Paleontological Journal 42 9: 859–995 doi:101134/S0031030108090013 
  4. ^ Battail, B 2000 "A comparison of Late Permian Gondwanan and Laurasian amniote faunas" Journal of African Earth Sciences 31 1: 165–174 doi:101016/s0899-53620000081-6 
  5. ^ Battail, B; Surkov, MV 2003 "Mammal-like reptiles from Russia" In Benton, MJ; Shishkin, MA; and Unwin, DM eds The Age of Dinosaurs in Russia and Mongolia Cambridge: Cambridge University Press pp 86–119 ISBN 9780521545822 CS1 maint: Uses editors parameter link


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