Name: Sacisaurus ‭(‬Saci lizard‭)‬.
Phonetic: Sa-ce-sore-us.
Named By: J.‭ ‬Ferigolo‭ & ‬M.‭ ‬C.‭ ‬Langer‭ ‬-‭ ‬2007.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauromorpha,‭ ‬Dinosauriformes,‭ ‬Silesauridae.
Species: S.‭ ‬agudoensis‭ (‬type‭)‬.
Diet: Herbivore.
Size: About‭ ‬1.5‭ ‬meters long.
Known locations: Brazil‭ ‬-‭ ‬Caturrita Formation.
Time period: Carnian/Norian of the Triassic.
Fossil representation: Dentaries and partial skull and post cranial remains.

       A member of the Silesauridae‭ (‬and hence relative of Silesaurus‭)‬,‭ ‬Sacisaurus was a late Triassic dinosauriform from South America.‭ ‬Although much of the skeleton of Sacisaurus is still unknown,‭ ‬the parts which have been recovered and studied have revealed traits that are similar to ornithischian dinosaurs.‭ ‬Better known as‭ ‘‬bird hipped‭’ ‬dinosaurs,‭ ‬ornithischians went on to produce such diverse groups as ornithopods,‭ ‬hadrosaurs,‭ ‬ceratopsians,‭ ‬ankylosaurs,‭ ‬stegosaurs and pachycephalosaurs.‭ ‬Paradoxically,‭ ‬the birds are believed to have evolved from the theropod line of‭ ‘‬lizard hipped‭’ ‬dinosaurs.
       If the ancestral line of ornithischian dinosaurs can be traced back to Sacisaurus,‭ ‬then that would mean that the two main groups of saurischian and ornithischian dinosaurs actually became established before either group could technically be described as a dinosaur,‭ ‬which in turn could suggest that the two groups appeared as a convergent evolution derived from common ancestors.‭
       Sacisaurus is known to have had quite small teeth which‭ ‬did not grow bigger than three‭ ‬millimetres long.‭ ‬These teeth seem to be best adapted to processing plants,‭ ‬which would suggest that Sacisaurus was a herbivore.‭ ‬What is known about the post cranial skeleton is that the legs of Sacisaurus were long in proportion to the length of the body.‭ ‬These legs indicate that Sacisaurus were fast runners and probably relied upon speed to outrun potential threats such as rauisuchians and predatory dinosauriformes.

Further reading
-‭ ‬A Late Triassic dinosauriform from south Brazil and the origin of the ornithischian predentary bone.‭ ‬-‭ ‬Historical Biology‭ ‬19‭(‬1‭)‬:23-33‭ ‬-‭ ‬J.‭ ‬Ferigolo‭ & ‬M.‭ ‬C.‭ ‬Langer‭ ‬-‭ ‬2006.


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