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Eotrachodon orientalis
Taxonomy
Eotrachodon orientalis was named by Prieto-Márquez et al. (2016). Its type specimen is MSC 7949, a partial skeleton, and it is a 3D body fossil. Its type locality is AMg-1, Montgomery (PROXY), which is in a Santonian offshore shelf grainstone in the Mooreville Chalk Formation of Alabama.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Eotrachodon orientalis Prieto-Márquez et al. p. 2 |
| 2018 | Eotrachodon orientalis Gates et al. p. 13 |
| 2019 | Eotrachodon orientalis Takasaki et al. p. 3 |
| 2020 | Eotrachodon orientalis Dalla Vecchia p. 585 |
| 2021 | Eotrachodon orientalis Kobayashi et al. p. 1 |
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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.
†Eotrachodon orientalis Prieto-Márquez et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Prieto-Márquez et al. 2016 | Hadrosaurid dinosaur characterized by the following autapomorphies: tripartite circumnarial depression divided longitudinally into dorsal and ventral fossae, the latter being subdivided into caudoventral and lightly incised rostroventral fossae; dorsal fossa of circumnarial depression above bony naris extending further caudally than caudal extent of caudoventral fossa; caudodorsal region of circumnarial depression above bony naris excavating lateral nasal surface, deeply rostrally but gradually fading caudally; premaxillary lateral process abruptly deflected ventrally, forming a 165° angle with long axis of circumnarial depression; maxilla with subtriangular joint surface for jugal that is more laterally than dorsally facing and prominent dorsal jugal tubercle projected caudally; and steeply down-warped sagittal crest of parietal substantially elevated above temporal bar. In addition, Eotrachodon differs from other hadrosaurids in possessing the following unique combination of characters: thin, reflected oral margin of premaxilla (convergent in Gryposaurus, Prosaurolophus, and Saurolophus); maxilla combining deep rostral region; steeply angled rostrodorsal margin of rostroventral apex that forms a 45°angle with rostral alveolar margin; dorsal process positioned entirely caudal to mid-length of maxilla; extensive rostrodorsal margin with wide lateral exposure under lacrimal; and short (25% of maxillary length) and steeply sloping ectoperygoid shelf. | |
| A. Prieto-Márquez et al. 2016 | Autapomorphies of
E. orientalis include: 1) a tripartite circumnarial depression that is divided longitudinally into dorsal and ventral fossae, with the latter subdivided into caudoventral and lightly incised rostroventral fossae; 2) dorsal fossa of circumnarial depression above bony naris extending further caudally than caudal extent of caudoventral fossa; 3) caudodorsal region of circumnarial depression above bony naris excavating lateral nasal surface, deeply rostrally but gradually diminishing caudally; 4) premaxillary lateral process abruptly deflected ventrally, and forming a 165° angle with long axis of circumnarial depression; 5) maxilla with subtriangular joint surface for jugal that is more laterally than dorsally-facing and prominent dorsal jugal tubercle projected caudally; and finally 6) a steeply down-warped sagittal crest of the parietal substantially elevated above the temporal bar. |
Measurements
No measurements are available
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| Source: subo = suborder, o = order | |||||
| References: Benton 1983, Marsh 1875 | |||||
Age range: Late/Upper Santonian or 85.80000 to 83.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Santonian | USA (Alabama) | Eotrachodon orientalis (type locality: 181177) |