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| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Nichollsemys
Taxonomy
Nichollsemys was named by Brinkman et al. (2006). It is not extant. Its type is Nichollsemys baieri.
It was assigned to Chelonioidea by Brinkman et al. (2006).
It was assigned to Chelonioidea by Brinkman et al. (2006).
Species
N. baieri (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2006 | Nichollsemys Brinkman et al. |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. Brinkman et al. 2006 | A primitive non-protostegid chel- onioid similar to Toxochelysin that: a secondary palate is absent, the foramen palatinum posterius is large, the triturating surfaces are narrow but different from Toxochelys in the reduced exposure of the basisphenoid on the ventral surface of the palate, the presence of a mid-ventral ridge on the palate extending between the basisphenoid and vomer, the foramen anterior canalis carotici interni is separated by a thin bar of bone, the canalis caroticus internus joins the sulcus cavernosus, and the foramen caroticum laterale is larger than the foramen anterior canalis carotici intemi. Nichollsemys differs from Ctenochelys in the presence of relatively narrower triturating surfaces that do not include the vomer and a larger foramen palatinum posterius. Nichollsemys differs also from Porthochelys in exhibiting a relatively narrower skull that is more triangular-shaped in dorsal view and in the small exposure of the basisphenoid on the ventral surface of the palate. |
Measurements
No measurements are available
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| Source: superf = superfamily, subo = suborder, c = class, subp = subphylum | |||||
| References: Carroll 1988, Uetz 2005, Hendy et al. 2009, Bush and Bambach 2015 | |||||
Age range: Late/Upper Campanian or 83.50000 to 70.60000 Ma
Collections (2 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Campanian | Canada (Alberta) | N. baieri (62734 119088) |