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Miragaia longispinus
Taxonomy
Stegosaurus longispinus was named by Gilmore (1914). Its type specimen is UW D54, a partial skeleton, and it is a 3D body fossil. Its type locality is Alcova Quarry (UW), which is in a Kimmeridgian/Tithonian terrestrial horizon in the Morrison Formation of Wyoming.
It was recombined as Kentrosaurus longispinus by Olshevsky and Ford (1993); it was recombined as Natronasaurus longispinus by Ulansky (2014), Ulansky (2014) and Ulansky (2014); it was recombined as Alcovasaurus longispinus by Galton and Carpenter (2016) and Borinder et al. (2016); it was considered a nomen dubium by Maidment et al. (2008); it was recombined as Miragaia longispinus by Costa and Mateus (2019).
It was recombined as Kentrosaurus longispinus by Olshevsky and Ford (1993); it was recombined as Natronasaurus longispinus by Ulansky (2014), Ulansky (2014) and Ulansky (2014); it was recombined as Alcovasaurus longispinus by Galton and Carpenter (2016) and Borinder et al. (2016); it was considered a nomen dubium by Maidment et al. (2008); it was recombined as Miragaia longispinus by Costa and Mateus (2019).
Synonymy list
| Year | Name and author |
|---|---|
| 1914 | Stegosaurus longispinus Gilmore p. 111 fig. 66 |
| 1915 | Stegosaurus longispinus Hennig p. 11 |
| 1916 | Stegosaurus longispinus Mook p. 145 |
| 1930 | Stegosaurus longispinus Hay p. 234 |
| 1964 | Stegosaurus longispinus Kuhn p. 38 |
| 1990 | Stegosaurus longispinus Breithaupt p. 11 |
| 1990 | Stegosaurus longispinus Galton |
| 1993 | Kentrosaurus longispinus Olshevsky and Ford |
| 2001 | Stegosaurus longispinus Carpenter et al. p. 70 |
| 2004 | Stegosaurus longispinus Galton and Upchurch p. 345 |
| 2006 | Stegosaurus longispinus Chure et al. p. 237 |
| 2006 | Stegosaurus longispinus Mateus p. 231 |
| 2007 | Stegosaurus longispinus Escaso et al. p. 371 |
| 2010 | Stegosaurus longispinus Galton p. 195 |
| 2014 | Natronasaurus longispinus Ulansky p. 6 |
| 2016 | Alcovasaurus longispinus Borinder et al. p. 64 |
| 2016 | Alcovasaurus longispinus Galton and Carpenter p. 189 |
| 2019 | Miragaia longispinus Costa and Mateus p. 19 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Miragaia longispinus Gilmore 1914
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. M. Galton and K. Carpenter 2016 | Autapomorphies: all caudal vertebrae bear transverse processes; distal caudal centra short, so height greater than length; femoral condylar articular surface confined almost exclusively to the distal surface; two pairs of greatly elongate distal dermal tail spines (~90% of femoral length) with subequal bases and slender shafts; posterior pair widest at ~25% of length. Also differs from Morrison Stegosaurus stenops, S. ungulatus and Hesperosaurus mjosi in having six pairs of sacral ribs. | |
| F. Costa and O. Mateus 2019 | Modified from [18]. Differs from all other stegosaurs in possessing: (i) femoral condylar articular surface confined almost exclusively to the distal surface;
Likely also diagnostic: (ii) posterior dermal tail spines with subequal bases; (iii) posterior dermal tail spines widest at ~25% of length. Also differs from Morrison Stegosaurus stenops, S. ungulatus and H. mjosi in having six pairs of sacral ribs [18]. |