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Atlasaurus imelakei
Taxonomy
Atlasaurus imelakei was named by Monbaron et al. (1999). Its type specimen is Musée des sciences de la Terre de Rabat (no number), a skeleton, and it is a 3D body fossil. Its type locality is Wawmda, Tilougguit Basin, which is in a Bathonian wet floodplain sandstone/siltstone in the Guettioua Formation of Morocco.
Synonymy list
| Year | Name and author |
|---|---|
| 1999 | Atlasaurus imelakei Monbaron et al. pp. 520-522 fig. 1 |
| 2002 | Atlasaurus imelakei Wilson p. 248 |
| 2004 | Atlasaurus imelakei Upchurch et al. p. 265 |
| 2010 | Atlasaurus imelakei Marty et al. p. 129 |
| 2010 | Atlasaurus imelakei Taquet p. 94 |
| 2012 | Atlasaurus imelakei D'Emic |
| 2012 | Atlasaurus imelakei Knoll et al. p. 2 |
| 2014 | Atlasaurus imelakei Mocho et al. |
| 2015 | Atlasaurus imelakei Rauhut p. 48 |
| 2021 | Atlasaurus imelakei Apesteguía et al. |
| 2021 | Atlasaurus imelakei Bindellini and Dal Sasso p. 153 |
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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.
†Atlasaurus imelakei Monbaron et al. 1999
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Monbaron et al. 1999 | Autapomorphies include: supratemporal fenestra twice as wide as long (140 by 70 mm) not visible in lateral perspective; combined width of paroccipital processes 48 % of estimated length of mandible; paroccipital processes extend horizontally at nearly right angles to long axis of skull; mandibular symphysis and dentary very shallow (symphyseal depth 116 % minimum depth of dentary, probably reversal from primitive state in sauropods); length of humerus 65 % of estimated length of dorsal series; length of ulna exceeds length of tibia by about 115 %.
In other known sauropods the supratemporal fenestra is more dilated anteroposteriorly, and the dorsal margins of the fenestra slope laterally so that it is visible in lateral perspective; the paroccipital process is markedly inclined ventrodistally, posteroventrally or both; the combined width of the processes is less than 48 % of the length of the mandible (table I); the ratio between the symphyseal depth and the minimum depth of the dentary is at least 150 % (Wilson and Sereno, 1998); the humerus is shorter relative to the estimated length of the dorsal series; and the ulna does not surpass the tibia so greatly in length (McIntosh, 1990, p.377). Features in the skeletal anatomy of Atlasaurus imelakei (see below) distinguish it from all other Jurassic sauropods (for brief descriptions and references to other Jurassic sauropod taxa, see McIntosh, 1990). |
Body mass estimates
| estimate | equation | reference |
|---|---|---|
| 40.2 tons | Sauropoda femur circumference | Anderson et al. 1985 |
| 14.5 tons | Sauropoda humerus circumference | Anderson et al. 1985 |
| mean: 24.1 tons | ||
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| femur circumference | 1 | 690.0 | |||||
| humerus circumference | 1 | 565.0 |
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| Source: infrao = infraorder | |||||
| Reference: Marsh 1875 | |||||