The dinosaur Grallator , known only from its footprints, may be Podokesaurus. This dinosaur may be the same as Coelophysis or perhaps an immature Rioarribasaurus . It dates from the early to middle Jurassic period about 166-163 million years ago. Poekilopleuron was named by paleontologist Eudes-Deslongchamps in 1838. Fossils were found in northern France.
Reptiles are poikilothermic.
It was discovered by Rev. Wm. Fox in 1865 and named by Sir Richard Owen in 1867. Polyonax may be a juvenile Triceratops . Polyonax was named by Cope in 1874. The type species is P. mortuarius .