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Nipponosaurus
Taxonomy
Nipponosaurus was named by Nagao (1936). Its type is Nipponosaurus sachalinensis.
It was synonymized subjectively with Mandschurosaurus by Romer (1966), Thulborn (1974); it was considered a nomen dubium by Norman and Sues (2000); it was considered a nomen dubium by Godefroit et al. (2008).
It was assigned to Trachodontidae by Nagao (1936), Nagao (1938); to Ornithopoda by Huene (1958); to Hadrosauridae by Romer (1956), Kuhn (1964), Rozhdestvensky (1977), Carroll (1988); to Lambeosauridae by Huene (1959), Matsukawa and Obata (1994); to Corythosaurini by Evans and Reisz (2007), Cruzado-Caballero et al. (2010); and to Lambeosaurinae by Tatarinov (1964), Rozhdestvensky (1968), Maryanska and Osmólska (1981), Weishampel and Weishampel (1983), Weishampel and Horner (1990), Chapman and Brett-Surman (1990), Horner et al. (2004), Suzuki et al. (2004), Lund and Gates (2006), Prieto-Márquez (2010), Cruzado-Caballero and Powell (2017), Dalla Vecchia (2020).
It was synonymized subjectively with Mandschurosaurus by Romer (1966), Thulborn (1974); it was considered a nomen dubium by Norman and Sues (2000); it was considered a nomen dubium by Godefroit et al. (2008).
It was assigned to Trachodontidae by Nagao (1936), Nagao (1938); to Ornithopoda by Huene (1958); to Hadrosauridae by Romer (1956), Kuhn (1964), Rozhdestvensky (1977), Carroll (1988); to Lambeosauridae by Huene (1959), Matsukawa and Obata (1994); to Corythosaurini by Evans and Reisz (2007), Cruzado-Caballero et al. (2010); and to Lambeosaurinae by Tatarinov (1964), Rozhdestvensky (1968), Maryanska and Osmólska (1981), Weishampel and Weishampel (1983), Weishampel and Horner (1990), Chapman and Brett-Surman (1990), Horner et al. (2004), Suzuki et al. (2004), Lund and Gates (2006), Prieto-Márquez (2010), Cruzado-Caballero and Powell (2017), Dalla Vecchia (2020).
Species
N. sachalinensis (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1936 | Nipponosaurus Nagao p. 187 |
| 1938 | Nipponosaurus Nagao pp. 312-313 |
| 1956 | Nipponosaurus Romer p. 630 |
| 1958 | Niponosaurus Huene p. 206 |
| 1959 | Nipponosaurus Huene p. 122 |
| 1964 | Nipponosaurus Kuhn p. 23 |
| 1964 | Nipponosaurus Tatarinov p. 567 |
| 1968 | Nipponosaurus Rozhdestvensky |
| 1977 | Nipponosaurus Rozhdestvensky p. 113 |
| 1981 | Nipponosaurus Maryanska and Osmólska p. 8 |
| 1983 | Nipponosaurus Weishampel and Weishampel p. 44 |
| 1988 | Nipponosaurus Carroll |
| 1990 | Nipponosaurus Chapman and Brett-Surman p. 177 |
| 1990 | Nipponosaurus Weishampel and Horner p. 558 |
| 1994 | Nipponosaurus Matsukawa and Obata p. 101 |
| 2004 | Nipponosaurus Horner et al. p. 442 |
| 2004 | Nipponosaurus Suzuki et al. p. 146 |
| 2006 | Nipponosaurus Lund and Gates p. 266 |
| 2007 | Nipponosaurus Evans and Reisz pp. 386-387 fig. 9 |
| 2010 | Nipponosaurus Cruzado-Caballero et al. p. 1510 fig. 4 |
| 2010 | Nipponosaurus Prieto-Márquez p. 454 |
| 2017 | Nipponosaurus Cruzado-Caballero and Powell p. 12 fig. 13 |
| 2020 | Nipponosaurus Dalla Vecchia p. 619 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Nagao 1936 | Generic and Specific Characters: A small trachodont dinosaur with the skull deep, rather broad, short, and probably steep in front. The cranium squarish in outline in lateral view. The frontal region with a low swelling. The "crest" presumably represented by an incipient dome-like prominence. Vertebrae with large neural canals. Cervical centra strongly opisthocoelous, with very convex anterior articular surfaces. Dorsal centra much reduced in size, moderately opisthocoelous, and almost flat anteriorly, with well developed and high neural spines. Caudal centra slightly amphicoelous with well developed chevrons. Scapula slender and straight. Ischium with a well developed foot-like expansion which is distinctly excavated externally. Femur, tibia and fibula of nearly equal length. Metatarsals rather long and massive. |