Eolambia

Name: Eolambia ‭(‬Dawn Lambe‭ ‬-‭ ‬after the palaeontologist Lawrence Lambe‭)‬.
Phonetic: E-oh-lam-be-ah.
Named By: James Kirkland‭ ‬-‭ ‬1998.
Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Ornithischia,‭ ‬Ornithopoda,‭ ‬Iguanodontia,‭ ‬Hadrosauroidea.
Species: E.‭ ‬caroljonesa‭ (‬type‭)‬.
Diet: Herbivore.
Size: Uncertain.‭ ‬Estimates range from‭ ‬6‭ ‬to‭ ‬9‭ ‬meters long.
Known locations: USA,‭ ‬Utah‭ ‬-‭ ‬Cedar Mountain Formation,‭ ‬Mussentuchit Member.
Time period: Cenomanian of the Cretaceous.
Fossil representation: ‭P‬artial skull and partial skeletons of several individuals‭ (‬adult and juvenile‭) ‬as well as eggs and embryos.

       Eolambia was established after the remains of several individuals were found in the Carol Quarry of the Mussentuchit Member of the Cedar Mountain formation,‭ ‬so named after‭ ‬Carol Jones who first discovered the remains with her husband Ramal in‭ ‬1992.‭ ‬The name Eolambia means‭ ‘‬dawn Lambe‭’‬,‭ ‬a reference to the last name of the famous American palaeontologist Lawrence Lambe.‭ ‬Lambe also had the hadrosaur Lambeosaurus named after him,‭ ‬and this ties with Eolambia as well since this genus is considered a more primitive form of ornithopod dinosaur than Lambeosaurus.‭ ‬The type species name of Eolambia,‭ ‬E.‭ ‬caroljonesa is in further honour to Carol Jones.
       At the time‭ ‬of writing,‭ ‬the remains of at least eleven individual Eolambia are known to science,‭ ‬and between them most parts of the skeleton can be studied.‭ ‬However,‭ ‬because all of the known individuals are known by only partial remains,‭ ‬size estimates for Eolambia can vary between authors.‭ ‬At the time of its description,‭ ‬James Kirkland estimated the length of Eolambia at nine meters long,‭ ‬but in‭ ‬2010,‭ ‬Gregory S.‭ ‬Paul estimated the length at six meters.
       Eolambia was once considered to be a hadrosaurid,‭ ‬and the most primitive lambeosaurine at that.‭ ‬Today however it is now considered to be a hadrosauroid.‭ ‬For clarification,‭ ‬Hadrosauroids are members of the Hadrosauroidea,‭ ‬while hadrosaurids belong in the Hadrosauridae.‭ ‬Both of these groups are for the classification of large ornithopod dinosaurs,‭ ‬but the hadrosaurids are more developed‭ (‬advanced in their physical development‭) ‬than hadrosauroids.‭ ‬In addition to this,‭ ‬Eolambia has been considered to be closely related to Probactrosaurus.
       Eolambia lived at a time and location that may have seen it living alongside armoured dinosaurs such as Peloroplites and Animantarx,‭ ‬other ornithopod dinosaurs like Tenontosaurus,‭ ‬and Zephyrosaurus,‭ ‬as well as sauropods like Abydosaurus.‭ ‬Predatory dinosaurs would have also been roaming around the early cretaceous habitats of Utah,‭ ‬and although so far only known from other members of the Cedar Mountains Formation,‭ ‬possible contenders for predators of Eolambia might include dinosaurs like the large dromaeosaur Utahraptor,‭ ‬to the even bigger carcharodontosaurid theropod Acrocanthosaurus.

Further reading
-‭ ‬A large primitive hadrosaur from the Lower Cretaceous of Utah,‭ ‬J.‭ ‬I.‭ ‬Kirkland‭ & ‬D.‭ ‬Burge‭ ‬-‭ ‬1994.
-‭ ‬A new hadrosaurid from the upper Cedar Mountain Formation‭ (‬Albian-Cenomanian:‭ ‬Cretaceous‭) ‬of eastern Utah‭ ‬-‭ ‬the oldest known hadrosaurid‭ (‬lambeosaurine‭?)‬,‭ ‬J.‭ ‬I.‭ ‬Kirkland‭ ‬-‭ ‬1998.
-‭ ‬A reassessment of the phylogenetic status of Eolambia caroljonesa‭ (‬Ornithischia:‭ ‬Iguanodontia‭)‬,‭ ‬with comments on the North American iguanodontian record,‭ ‬J.‭ ‬J.‭ ‬Head‭ ‬-‭ ‬1999.
-‭ ‬Osteology of the Basal Hadrosauroid Eolambia caroljonesa‭ (‬Dinosauria:‭ ‬Ornithopoda‭) ‬from the Cedar Mountain Formation of Utah,‭ ‬A.‭ ‬T.‭ ‬McDonald,‭ ‬J.‭ ‬Bird,‭ ‬J.‭ ‬I.‭ ‬Kirkland‭ & ‬P.‭ ‬Dodson‭ ‬-‭ ‬2012.



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