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PLANICOXA

a plant-eating styracosternan iguanodont dinosaur from the Late Cretaceous of North America.
Pronunciation: plan-i-KOHK-suh
Meaning: Flat hip
Author/s: DiCroce and Carpenter (2001)
Synonyms: None known
First Discovery: Utah, USA
Chart Position: 406

Planicoxa venenica

Planicoxa venenica is a wide-load iguanodont known from an odd "flat" hip bone (dorso-ventrally depressed ilium, to boffins) and other bits and bobs that were found in Utah's Cedar Mountain Formation—an area rich in remnants of ornithopods, theropods and sauropods, some of which were discovered alongside mammals, turtles and fish.

The area has its fair share of other iguanodonts too, including Cedarosaurus crichtoni which was described in 2007 and almost immediately pegged as a potential synonym of Planicoxa venenica by suspicious paleontologists. Both are known from sparse, fragmentary fossils and the most significant difference seems to be their size. Although lacking in compareable parts, they were found at different depths that were separated by at least seven million years so the chances of their size difference being growth related, that is; they represent an adult and juvenile of the same species, are rather slim.
(Flat hip from the Poison Strip)Etymology
Planicoxa is derived from the Latin "planus" (flat, level) and "coxa" (hip), named for the flat appearance of its ilium (a hip bone).
The species epithet, venenica, is Latin for "poison", and refers to the Poison Strip Sandstone Member of the Cedar Mountain Formation where it was discovered.
Discovery
The remains of Planicoxa venenica were discovered at "Tony's Bone Bed" in the Poison Strip Member of the Cedar Mountain Formation, Grand County, Utah.
The holotype (DMNH 42504, housed at the Denver Museum of Natural History) is a well-preserved hip bone, some limb material and vertebrae.
Estimations
Timeline:
Era: Mesozoic
Epoch: Early Cretaceous
Stage: Late Aptian
Age range: 118-112 mya
Stats:
Est. max. length: ?
Est. max. hip height: ?
Est. max. weight: ?
Diet: Herbivore
Planicoxa depressa
Planicoxa depressa was originally named Camptosaurus depressus by Charles Gilmore in 1909 based on remains, including a similar odd flat ilium, from the Lakota Formation near Hot Springs, South Dakota, that he thought belonged to a stegosaur. After a stint being linked with Iguanodon lakotaensis (which has since been renamed Dakotadon), Carpenter and Wilson renamed these fossils Planicoxa depressa in 2008, but Andrew T. McDonald thought this move was unjustified and coined Osmakasaurus during his clean-up of species previously assigned to Camptosaurus in 2011.
References
• DiCroce, K. and Carpenter, K. (2001) "New ornithopod from the Cedar Mountain Formation (Lower Cretaceous) of Eastern Utah" in Darren H. Tanke and Kenneth Carpenter "Mesozoic Vertebrate Life".
• Carpenter, K. and Wilson, Y. (2008) "A new species of Camptosaurus (Ornithopoda: Dinosauria) from the Morrison Formation (Upper Jurassic) of Dinosaur National Moument, Utah, and a biomechanical analysis of its forelimb".
• Andrew T. McDonald (2011) "The taxonomy of species assigned to Camptosaurus (Dinosauria: Ornithopoda)".
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To cite this page:
Atkinson, L. "PLANICOXA :: from DinoChecker's dinosaur archive".
›. Web access: 21st Aug 2017.
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