Kentrosaurus enters the LRT alongside Stegosaurus

No surprises here.
The skull of Kentrosaurus (Fig 1) is known from just a few disconnected pieces. The post-crania differs little from the more completely known, Stegosaurus, other than plate and spine patterns. As mentioned earlier, there are no more large gaps in the large reptile tree (LRT, 2188 taxa). Additional taxa are going to be pretty much like something already present and tested.

FIgure 1. Kentrosaurus in a bipedal pose from Gierlinski and Sabath 2008.
FIgure 1. Kentrosaurus in a bipedal pose from Gierlinski and Sabath 2008.

In support of bipedal abilities in stegosaurs, Gierlinski and Sabath 2008 reported,
“Isolated pedal ichnites from the Morrison Formation (with a single tentatively associated manus print, and another one from Poland) and the only known trackways with similar footprints (Upper Jurassic of Asturias, Spain) imply bipedal gait of their trackmakers. Thus, problems with stegosaur tracks possibly stem from the expectation of their quadrupedality. Massive but
short stegosaur forelimbs suggest primarily bipedal locomotion, and quadrupedal defense posture.”

According to, re: Stegosaurus:
“Marsh’s initial vision of the animal was a sort of turtle-like dinosaur that lived mostly in water, but when coming out on land would walk bipedally. The latter idea derives in part from the disproportionate length of the limbs (though mind you some of these came from an Allosaurus, as mentioned), but also because it was commonly thought between the 1860s and the 1870s that all dinosaurs were bipeds, as the most complete dinosaur skeletons up to that point were those of Hadrosaurus and Dryptosaurus (Laelaps).”

Kentrosaurus aethiopicus
(Henning, 1915, Late Jurassic 4.5m) is a smaller stegosaur with more spines, rather than plates, from East Africa. Note the robust, but short forelimbs here elevated in a bipedal pose, as originally proposed for Stegosaurus and later agreed to by Bakker 1986.

Bakker RT 1986. The Dinosaur Heresies. New Theories Unlocking The Mystery of the Dinosaurs and Their Extinction, New York.
Gierliński GD and Sabath K 2008. Stegosaurian footprints from the Morrison Formation of Utah and their implications for interpreting other ornithischian tracks. Oryctos 8:29–46.
Hennig E 1915. Kentrosaurus aethiopicus, der Stegosauridae des Tendaguru. Sitzungsberichte der Gesselschaft natuforschender Freunde: 219-247. Berlin.


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