Valdosaurus

Name: Valdosaurus ‭(‬Weald lizard‭)‬.
Phonetic: Val-doe-sore-us.
Named By: Peter M.‭ ‬Galton‭ ‬-‭ ‬1977.
Synonyms: Dryosaurus canaliculatus.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Dryosauroidea,‭ ‬Dryosauridae.
Species: V.‭ ‬canaliculatus‭ (‬type‭)‬.
Diet: Herbivore.
Size: Holotype estimated at about‭ ‬1.2‭ ‬meter long,‭ ‬though this is also noted as being a juvenile.‭ ‬An isolated 50 centimetre long femur suggests an adult size of approximately 4.4 meters long when scaled up from the holotype.
Known locations: England.
Time period: Early Cretaceous.
Fossil representation: Partial post cranial remains.

       The Valdosaurus holotype fossils of two thigh bones‭ (‬femurs‭) ‬were first recovered in‭ ‬1848‭ ‬but thought to represent Iguanodon,‭ ‬and‭ ‬eventually being thought to be fossils of Hypsilophodon.‭ ‬Skip forward over a hundred years later and palaeontologist Peter M.‭ ‬Galton used the two thigh bones to establish a new species of Dryosaurus,‭ ‬D.‭ ‬canaliculatus.‭ ‬Just two years later however in‭ ‬1977,‭ ‬Peter M.‭ ‬Galton renamed his new species of Dryosaurus as a distinct new genus of ornithopod named Valdosaurus,‭ ‬with D.‭ ‬cacanaliculatus becoming a synonym to the genus.
       After this additional post cranial remains began being added to Valdosaurus,‭ ‬with fossils from locations as far away as Romania and Niger being identified as species of Valdosaurus.‭ ‬However many of these have now been questioned,‭ ‬and some of these‭ ‬have‭ ‬been used to create new dinosaur genera such as Elrahzosaurus from Niger.‭ ‬At the time of writing,‭ ‬the only valid species of Valdosaurus is the type species V.‭ ‬canaliculatus,‭ ‬with the holotype being the original two fourteen centimetre long femurs.‭ ‬Both of these femurs seem to have come from a juvenile however,‭ ‬making the adult size of Valdosaurus harder to establish with certainty.
       Valdosaurus should not be confused with the similarly named Valdoraptor.

Further reading
-‭ ‬English hypsilophodontid dinosaurs‭ (‬Reptilia:‭ ‬Ornithischia‭)‬,‭ ‬-‭ ‬Palaeontology‭ ‬18‭(‬4‭)‬:‭ ‬741-752.‭ ‬-‭ ‬Peter M.‭ ‬Galton‭ ‬-‭ ‬1975.
-‭ ‬The Upper Jurassic dinosaur Dryosaurus and a Laurasia-Gondwana connection in the Upper Jurassic.‭ ‬-‭ ‬Nature‭ ‬268‭(‬5617‭)‬:‭ ‬230-232.‭ ‬-‭ ‬Peter M.‭ ‬galton‭ ‬-‭ ‬1977.
-‭ ‬Valdosaurus,‭ ‬a hypsilophodontid dinosaur from the Lower Cretaceous of Europe and Africa,‭ ‬-‭ ‬Géobios‭ ‬13:‭ ‬147-159‭ ‬-‭ ‬Peter M.‭ ‬Galton‭ & ‬P.‭ ‬Taquet‭ ‬-‭ ‬1982.
-‭ ‬Notes on Neocomian‭ (‬Late Cretaceous‭) ‬ornithopod dinosaurs from England‭ ‬-‭ ‬Hypsilophodon,‭ ‬Valdosaurus,‭ "‬Camptosaurus‭"‬,‭ "‬Iguanodon‭" ‬-‭ ‬and referred specimens from Romania and elsewhere.‭ ‬-‭ ‬Revue de Paléobiologie‭ ‬28‭(‬1‭)‬:‭ ‬211-273‭ ‬-‭ ‬Peter M.‭ ‬Galton‭ ‬-‭ ‬2009.



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