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Gyrodus cordillera
Taxonomy
Mesturus cordillera was named by Martill et al. (1998). Its type specimen is UCN 080597 MGHF, a partial skull, and it is a 3D body fossil. Its type locality is Quebrada Corral, which is in a Callovian/Oxfordian marginal marine mudstone/limestone in the Quehita Formation of Chile.
It was recombined as Gyrodus cordillera by Kriwet (2000).
It was recombined as Gyrodus cordillera by Kriwet (2000).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1998 | Mesturus cordillera Martill et al. p. 488 figs. 2, 4 |
| 2000 | Gyrodus cordillera Kriwet |
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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.
†Gyrodus cordillera Martill et al. 1998
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Kriwet 2000 | The skull gives some additional information on the taxonomy of the species. The dermal tesserae of the cheek region and the scaled gular in combination with styliform prehensile teeth on the premaxillae and dentalosplenials and a mesethmoid bone which is covered anteriorly with dermal tesserae is characteristic for Gyrodontoidei sensu Nursall (1996). Nursall (1996) united in his Gyrodontoidei the Gyrodontidae and Mesturidae.
Gyrodus is characterized inter alia by the presence of a rather short and pyriform maxilla without teeth. In contrast, the maxilla of Mesturus is at least twice as long as wide and narrow with the ventral and dorsal margins more or less parallel (Fig. 7). The presence of Gyrodus-type maxilla in combination with typical Gyrodus-like teeth in the Chilean species supports its attribution to Gyrodus. |
Measurements
No measurements are available
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| Source: o = order, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009 | |||||
Age range: Oxfordian or 163.50000 to 157.30000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Callovian - Oxfordian | Chile (Antofagasta) | Mesturus cordillera (type locality: 55686) | |
| Oxfordian | Chile (Antofagasta) | Mesturus cordillera (134865) |