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Saurian - Denversaurus Speed Sculpt
Saurian - Denversaurus Speed Sculpt
Published: 2018/01/17
Channel: LittleBaardo
Denversaurus
Denversaurus's Mad World
Published: 2017/02/26
Channel: Magic Sloth Wizard
OBM - Dinosaur - Denversaurus
OBM - Dinosaur - Denversaurus
Published: 2016/12/30
Channel: Our Best Moments
Saurian - Mosa Battles Trike In Ocean, Rex VS Mosa Outcome & More Updates! - Gameplay
Saurian - Mosa Battles Trike In Ocean, Rex VS Mosa Outcome & More Updates! - Gameplay
Published: 2018/01/19
Channel: Anthomnia
Floodplains of Montana - Tiranossauro Rex Com Penas! | "Roblox" (Gameplay/PT-BR) "Pre-Alpha"
Floodplains of Montana - Tiranossauro Rex Com Penas! | "Roblox" (Gameplay/PT-BR) "Pre-Alpha"
Published: 2017/01/29
Channel: SpartanGamer
Saurian - DEV INTERVIEW, KICKSTARTER, LIFE CYCLES, MATING, COURTING, DINOSAURS (Saurian Gameplay)
Saurian - DEV INTERVIEW, KICKSTARTER, LIFE CYCLES, MATING, COURTING, DINOSAURS (Saurian Gameplay)
Published: 2016/06/14
Channel: MeatyLock
Saurian - New Dinosaur Update Incoming! Huge Dev Reveal & The Mosa Secret + Rex VS Mosa Coming!?
Saurian - New Dinosaur Update Incoming! Huge Dev Reveal & The Mosa Secret + Rex VS Mosa Coming!?
Published: 2018/01/12
Channel: Anthomnia
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Published: 2017/06/10
Channel: Magic Sloth Wizard
Saurian | I
Saurian | I'M A DINOSAUR!! | Part 1
Published: 2018/01/31
Channel: GamersObservation
Albetosaurus Vs Rajasaurus Resound by me
Albetosaurus Vs Rajasaurus Resound by me
Published: 2017/08/24
Channel: Sebastian Reyna Rivas
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Published: 2017/02/26
Channel: Magic Sloth Wizard
System of Physical Surfaces | UE4 Vehicle From Scratch
System of Physical Surfaces | UE4 Vehicle From Scratch
Published: 2018/01/17
Channel: Иван Новожилов
Trollasaur 2
Trollasaur 2
Published: 2017/06/10
Channel: Magic Sloth Wizard
Edmontonia: Dinosaur of the Day
Edmontonia: Dinosaur of the Day
Published: 2016/11/10
Channel: I Know Dino
Saurian - CLIMB FROM DINOSAURS! - Tree Climbing & More! - Epic Saurian Update On The Way! - Gameplay
Saurian - CLIMB FROM DINOSAURS! - Tree Climbing & More! - Epic Saurian Update On The Way! - Gameplay
Published: 2018/01/27
Channel: Anthomnia
Floodplains of Montana teaser
Floodplains of Montana teaser
Published: 2017/01/28
Channel: TheAnzuGod
How to convert characters for GTA San Andreas - 3DS Max Tutorial
How to convert characters for GTA San Andreas - 3DS Max Tutorial
Published: 2018/01/20
Channel: Assasinge Gaming
Saurian - Sobrevivência Implacável, Dakotaraptor Bebê! Gameplay #1 (PT-BR)
Saurian - Sobrevivência Implacável, Dakotaraptor Bebê! Gameplay #1 (PT-BR)
Published: 2017/08/03
Channel: Anubis
How Scientifically Accurate is the Jurassic World CARNOTAURUS | Dinos in the Media + PK news update
How Scientifically Accurate is the Jurassic World CARNOTAURUS | Dinos in the Media + PK news update
Published: 2018/01/18
Channel: Calico Jackosaur
The hunt for bootleg komodo dragons (Saurian Gameplay)
The hunt for bootleg komodo dragons (Saurian Gameplay)
Published: 2018/01/13
Channel: THE Airconditioner
roblox flooded plains of montana gameplay test
roblox flooded plains of montana gameplay test
Published: 2017/02/06
Channel: Mr Parasaur
Saurian TREE CLIMBING & NEW TRIKE SKIN+BUFFS & NERFS COMING SOON! -Gameplay
Saurian TREE CLIMBING & NEW TRIKE SKIN+BUFFS & NERFS COMING SOON! -Gameplay
Published: 2018/01/28
Channel: Laacer
Saurian - Ocean Surprise
Saurian - Ocean Surprise
Published: 2018/01/07
Channel: Jynn
Roblox|Floodplains of Montana|Triceratops vs T.rex and Potato.
Roblox|Floodplains of Montana|Triceratops vs T.rex and Potato.
Published: 2017/01/30
Channel: ThreeHornedGaming
Floodplains of Montana teaser 2
Floodplains of Montana teaser 2
Published: 2017/01/31
Channel: TheAnzuGod
Mesozoica   Carnotauro + Albertossauro
Mesozoica Carnotauro + Albertossauro
Published: 2018/01/21
Channel: LordBrian
Saurian: All Stage Clarification Stream
Saurian: All Stage Clarification Stream
Published: 2018/01/15
Channel: Scanova the Carnotaurus
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Published: 2018/01/20
Channel: alitocarioca1
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Published: 2017/06/10
Channel: Magic Sloth Wizard
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Published: 2017/08/05
Channel: Magic Sloth Wizard
Roblox|Floodplains of Montana|Triceratops life!
Roblox|Floodplains of Montana|Triceratops life!
Published: 2017/01/30
Channel: ThreeHornedGaming
Saurian:  Paleosaniwa vs Brachychampsa
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Published: 2017/11/20
Channel: PB Lobster
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Published: 2018/01/21
Channel: SchattenspielTV
Saurian - DAKOTAQUEEN Kills Rex AND Trike!
Saurian - DAKOTAQUEEN Kills Rex AND Trike!
Published: 2017/08/21
Channel: Nyxcatti
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Published: 2017/06/09
Channel: Magic Sloth Wizard
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Published: 2018/01/20
Channel: Waddigator
Saurian raptor prey restraint in a nutshell
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Published: 2017/06/09
Channel: Magic Sloth Wizard
OBM - Dinosaur - Jenghizkhan
OBM - Dinosaur - Jenghizkhan
Published: 2016/12/30
Channel: Our Best Moments
The Raptor and the Lizard
The Raptor and the Lizard
Published: 2017/06/09
Channel: Magic Sloth Wizard
Rex
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Published: 2017/08/01
Channel: Magic Sloth Wizard
Saurian | STOP HUNTING ME!! | Part 2
Saurian | STOP HUNTING ME!! | Part 2
Published: 2018/02/04
Channel: GamersObservation
Mosasaurus Added - Saurian Gameplay
Mosasaurus Added - Saurian Gameplay
Published: 2018/01/18
Channel: CWdude
Edmontonia: I Know Dino Podcast Episode 102
Edmontonia: I Know Dino Podcast Episode 102
Published: 2016/11/10
Channel: I Know Dino
Saurian pre-release: Dakotaraptor Climbing?
Saurian pre-release: Dakotaraptor Climbing?
Published: 2017/06/10
Channel: Magic Sloth Wizard
Extinct Dinosaurs: The Lambeosaurus
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Published: 2012/01/18
Channel: david90759
Saurian SWIMMING IS DANGEROUS! Mosa Update/New Devlog/New Playable Dino Coming Soon!
Saurian SWIMMING IS DANGEROUS! Mosa Update/New Devlog/New Playable Dino Coming Soon!
Published: 2018/01/12
Channel: Laacer
Lambeosaurus - Video Learning - WizScience.com
Lambeosaurus - Video Learning - WizScience.com
Published: 2015/08/05
Channel: Wiz Science™
SAURIAN: NEW PATCH [AI TEST]
SAURIAN: NEW PATCH [AI TEST]
Published: 2018/01/09
Channel: Paleo Wizzard
Flood Plains Of Montana [Pre Alpha Release!] #1 Thescelosaurus!!!
Flood Plains Of Montana [Pre Alpha Release!] #1 Thescelosaurus!!!
Published: 2017/01/29
Channel: Raptor Lord
Archaeoraptor Caçador! - (FloodPlain of Montana - Gameplay PT-BR) Roblox
Archaeoraptor Caçador! - (FloodPlain of Montana - Gameplay PT-BR) Roblox
Published: 2017/01/29
Channel: Anubis
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WIKIPEDIA ARTICLE

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Denversaurus
Temporal range: Late Cretaceous, 68–66 Ma
Dinosaur exhibit - Houston Museum of Natural Science - DSC01881.JPG
Skeleton casts of Denversaurus ("Tank") and Tyrannosaurus, Houston Museum of Natural Science
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Dinosauria
Order: Ornithischia
Family: Nodosauridae
Genus: Denversaurus
Bakker, 1988
Type species
Denversaurus schlessmani
Bakker, 1988

Denversaurus (meaning "Denver lizard") is a genus of herbivorous nodosaurid ankylosaurian dinosaur from the Late Cretaceous (late Maastrichtian) of western North America. Although at one point treated as a junior synonym of Edmontonia by some taxonomists, current research indicates that it is a distinct nodosaurid genus.

Description[edit]

In 2010, American paleontologist Gregory S. Paul estimated the length of Denversaurus at six meters and its weight at three tonnes.[1]

American paleontologist Robert T. Bakker considered Denversaurus distinct from Edmontonia and Chassternbergia in having a skull that was wide at the rear and a more rearward position of the eye sockets.[2] The holotype skull has a length of 496 millimetres and a rear width of 346 millimetres. In the referred specimen AMNH 3076 these proportions are less extreme, measuring 395 millimetres long with a rear width of 220 millimetre. According to American paleontologist Kenneth Carpenter, the greater width of both the holotype and the referred specimen was due to crushing.[3]

Vertebrate anatomist and paleontologist Michael Burns in 2015 published an abstract that concluded that Denversaurus was different from Edmontonia but similar to Panoplosaurus in having inflated, convex, cranial sculpturing with visible sulci, or troughs, between individual top skull armour elements, but is distinct from Panoplosaurus in having a relatively wider snout.[4]

Discovery and naming[edit]

In 1922, Philip Reinheimer, a collector and technician employed by the Colorado Museum of Natural History, the predecessor of the present Denver Museum of Nature and Science, near the Twito Ranch in Corson County, South Dakota discovered the fossil of an ankylosaurian in a Maastrichtian age terrestrial horizon of the Lance Formation. In 1943, American paleontologist Barnum Brown referred the find to Edmontonia longiceps.[5]

In 1988, Robert Thomas Bakker decided to split the genus Edmontonia. The species Edmontonia rugosidens he made into a separate genus Chassternbergia and the Denver fossil was named and described as a new genus and species. The type species of this genus was Denversaurus schlessmani. The generic name referred to the Denver Museum of Natural History at Denver, Colorado. The specific name honoured Lee E. Schlessman, a major benefactor of the museum and the founder of the Schlessman Family Foundation.[2]

The fossil the species is based on, the holotype DMNH 468, was discovered in a layer of the late Maastrichtian-age Lance Formation of South Dakota. It consists of a skull, lacking the lower jaws, and a number of osteoderms of the body armour. It is part of the collection of the Denver Museum of Nature and Science after which the genus was named. Bakker referred a second fossil to the species, specimen AMNH 3076, a skull found by Brown and American Museum of Natural History paleontologist Roland T. Bird at the Tornillo Creek in Brewster County, Texas, in a layer of the poorly dated Upper Cretaceous Aguja Formation, possibly from the Maastrichtian also.[2]

Scientists at the Black Hills Institute found a nodosaurid skeleton in Niobrara County, Wyoming, nick-named "Tank", which has been identified as Denversaurus. The specimen contains the lower jaws, parts of the torso and about a hundred osteoderms. It is part of the collection of the Rocky Mountain Dinosaur Resource Center under inventory number BHI 127327.[6]

Validity[edit]

The validity of Denversaurus was disputed in a 1990 paper on ankylosaurian systematics by Kenneth Carpenter, who noted that Bakker's diagnosis of Denversaurus was based primarily on Bakker's artistic restoration of the holotype in an uncrushed state. Since DMNH 468 was found crushed, Carpenter assigned Denversaurus to a Edmontonia sp., even though he noted its similarity to Edmontonia rugosidens.[3] A number of workers treated Denversaurus as synonymous with either E. rugosidens[7] or E. longiceps,[8] or alternatively a valid species of Edmontonia, an Edmontonia schlessmani.[9][1]

In a SVP 2015 abstract, Michael Burns revisited the systematics of latest Cretaceous nodosaurids from the Western Interior. According to Burns, Denversaurus is a valid taxon based on its phylogenetic position.[4]

Classification[edit]

Bakker in 1988 placed Denversaurus within an Edmontoniidae, the presumed sister group of the Nodosauridae within a Nodosauroidea that would not have been Ankylosauria but the last surviving Stegosauria.[2] These hypotheses have not been confirmed by modern cladistic analysis. Today the Denversaurus material, whether it presents a separate species or is identical to E. rugosidens or E. longiceps, is considered nodosaurid and ankylosaurian. Paul suggested that it were the direct descendant of E. longiceps.[1] Burns recovered Denversaurus as the sister species of Panoplosaurus.[4] Denversaurus is the latest known member of the Thyreophora.[2]

References[edit]

  1. ^ a b c Paul, G.S. (2010). The Princeton Field Guide to Dinosaurs, Princeton University Press.
  2. ^ a b c d e Bakker, R.T. (1988). "Review of the Late Cretaceous nodosauroid Dinosauria: Denversaurus schlessmani, a new armor-plated dinosaur from the Latest Cretaceous of South Dakota, the last survivor of the nodosaurians, with comments on Stegosaur-Nodosaur relationships". Hunteria 1(3): 1-23.(1988).
  3. ^ a b Carpenter, K. 1990. "Ankylosaur systematics: example using Panoplosaurus and Edmontonia (Ankylosauria: Nodosauridae)", In: Carpenter, K. & Currie, P.J. (eds) Dinosaur Systematics: Approaches and Perspectives, Cambridge University Press, Cambridge, pp. 281-298
  4. ^ a b c Burns, ME. Intraspecific Variation in Late Cretaceous Nodosaurids (Ankylosauria: Dinosauria). Journal of Vertebrate Paleontology, Program and Abstracts, 2015, 99–100.
  5. ^ B. Brown and E.M. Schlaikjer, 1943, "A study of the troödont dinosaurs with the description of a new genus and four new species", Bulletin of the American Museum of Natural History 82(5): 115-150
  6. ^ Carpenter K., DiCroce T., Kinneer B., Simon R., 2013, "Pelvis of Gargoyleosaurus (Dinosauria: Ankylosauria) and the Origin and Evolution of the Ankylosaur Pelvis", PLoS ONE 8(11): e79887. doi:10.1371/journal.pone.0079887
  7. ^ W. P. Coombs and T. A. Deméré. 1996. A Late Cretaceous nodosaurid ankylosaur (Dinosauria: Ornithischia) from marine sediments of coastal California. Journal of Paleontology 70(2):311-326
  8. ^ M. K. Vickaryous, T. Maryanska, and D. B. Weishampel. 2004. Ankylosauria. In D. B. Weishampel, P. Dodson, and H. Osmolska (eds.), The Dinosauria (second edition). University of California Press, Berkeley 363-392
  9. ^ Hunt, A.P. and Lucas, S.G., 1992, "Stratigraphy, Paleontology and age of the Fruitland and Kirkland Formations (Upper Cretaceous), San Juan Basin, New Mexico", New Mexico Geological Society Guidebook, 43rd Field Conference, San Juan Basin, volume 4, p. 217-240

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