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| - In July 1908, Professors William Harlow Reed and A.C. Dart of the University of Wyoming, in the Alcova Quarry in Natrona County, Wyoming, uncovered the skeleton of a stegosaurian. This would be the last major excavation of a dinosaur in which Reed was personally involved. In 1914, the find was named and described as Stegosaurus longispinus by Charles Whitney Gilmore on the basis of holotype UW 20503 (originally UW D54), a partial postcranial skeleton of an adult individual consisting of forty-two vertebrae, a fragmentary sacrum, two ischia, a portion of one pubis, the right femur, several ribs and four dermal tail spines. The specific name is derived from Latin longus, "long", and spina, "spine", in reference to the long tail spines.[2] Due to the presence of very long tail spines, S. long
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| abstract
| - In July 1908, Professors William Harlow Reed and A.C. Dart of the University of Wyoming, in the Alcova Quarry in Natrona County, Wyoming, uncovered the skeleton of a stegosaurian. This would be the last major excavation of a dinosaur in which Reed was personally involved. In 1914, the find was named and described as Stegosaurus longispinus by Charles Whitney Gilmore on the basis of holotype UW 20503 (originally UW D54), a partial postcranial skeleton of an adult individual consisting of forty-two vertebrae, a fragmentary sacrum, two ischia, a portion of one pubis, the right femur, several ribs and four dermal tail spines. The specific name is derived from Latin longus, "long", and spina, "spine", in reference to the long tail spines.[2] Due to the presence of very long tail spines, S. longispinus was treated as valid by subsequent authors.[3][4][5] In 1993, S. longispinus was by George Olshevsky and Tracy Lee Ford seen as a possible North American species of the African genus Kentrosaurus as a ?Kentrosaurus longispinus.[6] Unfortunately, the type specimen of this species was damaged in the late 1920s when the water pipes of the University of Wyoming's museum burst.[7] For this reason, the whereabouts of the type specimen were mistakenly considered to be lost,[8] although a femur catalogued as part of UW 20503 is still extant, as the last-surviving part of the type specimen.[9][10] Plaster casts had been made of the rear tail spikes. Also photographic evidence of the skeleton being excavated is still available, showing the bones in situ, as well as of the skeletal museum mount.[1] Although the validity of Stegosaurus longispinus was disputed because the long dermal spines were likely to be a product of ontogeny or sexual dimorphism,[8] the amateur freelance paleontologist Roman Ulansky decided that the long tail spines were sufficient to remove S. longispinus from Stegosaurus and place it in a new genus, "Natronasaurus". Ulansky interpreted "Natronasaurus" as a close relative of Kentrosaurus in accordance with the hypothesis of Olshevsky and Ford (1993).[11] Ulansky published the name in an electronic publication published by himself, that was not archived by an independent organisation nor had an ISSN. Peter Malcolm Galton and Kenneth Carpenter have pointed out that therefore the name coined by Ulansky is invalid, so they gave the genus another name, Alcovasaurus, in 2016, as part of a revision of the species. Galton and Carpenter also referred a very large round spike base to the species, found by Cliff Miles in Wyoming in the 1990s. Its present location is unknown but a cast was made with inventory number DMNH 33431.
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