Poekilopleuron

Name: Poekilopleuron ‭(‬Varied rib‭)‬.
Phonetic: Poe-ke-lo-plu-ron.
Named By: Jacques Amand Eudes-Deslongchamps‭ ‬-‭ ‬1838.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ ‬Allosauroidea,‭ ‬Sinraptoridae.
Species: P.‭ ‬bucklandii‭ (‬type‭)‬.
Diet: Carnivore.
Size: Estimated‭ ‬9‭ ‬meters long.
Known locations: France.
Time period: Bathonian of the Jurassic.
Fossil representation: Partial remains.

       Discovered back in the early days of scientific palaeontology,‭ ‬Eudes-Deslongchamp named the species Poekilopleuron bucklandii in honour of William Buckland,‭ ‬the man who named the first ever known dinosaur Megalosaurus.‭ ‬Additionally Eudes-Deslongchamp thought that Poekilopleuron may actually be the same species of dinosaur as Megalosaurus,‭ ‬an idea shared by the palaeontologists Fredriech von Huene in the twentieth century.‭ ‬Despite this however,‭ ‬most other palaeontologists continue to treat Poekilopleuron as a distinct genus. The genus name is derived from three distinct groups of ribs in the holotype.
       A second species of Poekilopleuron‭ (‬as Poicilopleuron valens‭) ‬was created in‭ ‬1870‭ ‬by Joseph Leidy based upon the description of a single partial tail vertebrae from the Morrison Formation of Colorado,‭ ‬USA.‭ ‬In‭ ‬1873‭ ‬Leidy renamed this species as a distinct genus,‭ ‬Antrodemus,‭ ‬however in‭ ‬1920‭ ‬Charles W.‭ ‬Gilmore identified it as a vertebra of an Allosaurus,‭ ‬an identification that has been accepted and followed by many other palaeontologists.
       Another species Poikilopleuron pusillus‭ (‬named by Richard Owen in‭ ‬1876‭) ‬was renamed Poekilopleuron minor by Edward Drinker Cope in‭ ‬1879‭ ‬only to be renamed as a new genus Aristosuchus by Harry Govier Seeley in‭ ‬1887.‭ ‬Poekilopleuron schmidti,‭ ‬created in‭ ‬1883‭ ‬by W.A.‭ ‬Kiprijanow has since been found to be based upon sauropod foot bones and unidentifiable ribs,‭ ‬which is why this species is no longer considered valid.‭ ‬The most recently named species of Poekilopleuron valesdunensis‭ (‬Ronan Allain,‭ ‬2002‭) ‬was renamed as the genus Dubreuillosaurus in‭ ‬2005.‭ ‬To date only the type species,‭ ‬P.‭ ‬bucklandii,‭ ‬remains.‭ ‬Additionally the original remains were destroyed in World War Two during the battle for Caen,‭ ‬which means that today we only have drawings and casts of‭ ‬the originals to go on.
       Poekilopleuron was towards the larger end of the scale for Jurassic era theropods from Europe.‭ ‬One interesting thing are the long fore arms of Poekilopleuron,‭ ‬which in general terms concerning theropods fits in with the pattern of theropod forearms getting progressively smaller during the Mesozoic.



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