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Amtaaguar crassus
Taxonomy
Myliobatis crassus was named by Gervais (1852). It is the type species of Amtaaguar.
It was recombined as Amtaaguar crassus by De Pasqua et al. (2025).
It was recombined as Amtaaguar crassus by De Pasqua et al. (2025).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1852 | Myliobatis crassus Gervais |
| 1876 | Myliobates magister Leidy p. 86 |
| 1927 | Myliobatis crassus Arambourg p. 233 |
| 1942 | Myliobatis magister Leriche p. 59 |
| 1946 | Myliobatis magister Rapp p. 511 |
| 2025 | Amtaaguar crassus De Pasqua et al. p. 532 |
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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.
†Amtaaguar crassus Gervais 1852
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Invalid names: Myliobatis magister Leidy 1876 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. J. De Pasqua et al. 2025 | Myliobatidae known only from dental plates, characterisable on
the basis of the following combination of characters (synapomorphies marked with an asterisk): 1) proportionally thick and large dental plates; 2) presence of a labio-lingually extended medial depression resulting in a ‘lip’ shaped plate in labial/lingual views*; 3) medial teeth slightly curved and ‘M’- shaped; 4) presence of a longitudinal median groove* and; 5) ridges or undulations on occlusal surface. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Hendy et al. 2009, Carroll 1988, Wagner 2023 | |||||
Collections (6 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Thanetian | USA (New Jersey) | Myliobatis magister (3113) | |
| Early/Lower Miocene - Middle Miocene | Argentina (Río Negro) | Amtaaguar crassus (211706) | |
| Miocene | USA (South Carolina) | Myliobatis magister (18506) | |
| MN 5 - MN 6 | Portugal | Myliobatis crassus (65912) | |
| Late/Upper Miocene | Portugal | Myliobatis crassus (56459) | |
| Messinian | Algeria | Myliobatis crassus (186631) |