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Bonapartesaurus rionegrensis
Taxonomy
Bonapartesaurus rionegrensis was named by Cruzado-Caballero and Powell (2017). Its type specimen is MPCA-Pv SM2, a partial skeleton, and it is a 3D body fossil. Its type locality is Salitral Moreno (NH1), which is in a Campanian/Maastrichtian fluvial sandstone/sandstone in the Allen Formation of Argentina.
Synonymy list
| Year | Name and author |
|---|---|
| 2017 | Bonapartesaurus rionegrensis Cruzado-Caballero and Powell p. 2 fig. 2–12 |
| 2018 | Bonapartesaurus rionegrensis Cruzado-Caballero et al. p. 182 |
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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.
†Bonapartesaurus rionegrensis Cruzado-Caballero and Powell 2017
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| P. Cruzado-Caballero and J. E. Powell 2017 | Hadrosaurine hadrosaurid characterized by the following unique combination of characters: ratio between the height of the sacral neural spines and that of the centrum greater than 3.5; neural spines of the anterior section of the caudal vertebrae extremely long (between three and a half and four times the height of the centrum) and evenly expanding distally; a preacetabular process slightly deflected ventrally, with the angle greater than 150 ; the ratio between the maximum dorsoventral depth of the posterior end of the preacetabular process and the dorsoventral distance from the pubic peduncle to the dorsal margin of the ilium less than 0.50; the ratio between the dorsoventral height and anteroposterior length of the iliac blade 0.8 or greater; asymmetrical lateral profile of the supraacetabular process; the posterior portion of the postacetabular process markedly thicker mediolaterally as a result of the dorsomedial twist of the postacetabular process; an anteriorly expanded cnemial crest restricted to the proximal end of the tibia; and articular surface of the astragalus for the internal malleolus of the tibia moderately expanded medially, articulating with only part of the ventral surface of the tibial internal malleolus. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Benton 1983, Marsh 1875 | |||||
Age range: base of the Late/Upper Campanian to the top of the Early/Lower Maastrichtian or 83.50000 to 66.00000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian - Early/Lower Maastrichtian | Argentina (Río Negro) | Saurolophinae indet. (type locality: 32370) |