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Nanolophodon tutuca
Taxonomy
Nanolophodon tutuca was named by Castro et al. (2021). Its type specimen is MCT 4419M, a maxilla (a fragment of left maxilla with P3-M2 (moderate to advanced wear)), and it is a 3D body fossil. Its type locality is São José de Itaborai, which is in an Eocene fissure fill marl in the Itaboraí Formation of Brazil. It is the type species of Nanolophodon.
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Nanolophodon tutuca Castro 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.
†Nanolophodon tutuca Castro et al. 2021
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. O. R. Castro et al. 2021 | Small notoungulate bearing the basic tetralophodont pattern of the order. It is excluded from Typotheria by the absence of mesiolabial fossette limited distally by the crista 1 and from Toxodontia by the absence of crista intermedia near the mesial end of the crochet. Among basal forms, it is excluded from Notostylopidae by the presence of a strong metacone column on the ectoloph, the absence of crenulations on the crochet (characteristic of some notostylopids), and the greater development of the paraconid. Regarding genera traditionally considered as henricosborniids, the new taxon shows the following com- bination of characters: upper molars with tetralophodont pattern more developed and marked than in all other henricosborniids, and particularly regarding Henricosbornia Ameghino, 1901, Peripantostylops Ameghino, 1901, and Othnielmarshia; crochet proportionally longer than in all other henricosborniids except Orome Bauzá et al., 2019; paracone and metacone columns more developed than in Henricosbornia, Peripantostylops, Othnielmarshia, and Orome, but similar to Simpsonotus Pascual et al., 1978; and mesial and distal cingula not developed in the lingual wall of pro- tocone and hypocone, differing from Henricosbornia and Peripantostylops. Upper premolars with strong parastyle, separated from the paracone column by a deeper flexus than in Henricosbornia and Simpsonotus, conspicuous crochet in P3-4 (differing from all the mentioned genera), and more triangular and less transverse outline than in Simpsonotus. Lower molars similar to Henricosbornia but with a larger paraconid than in Othnielmarshia, Peripantostylops, Simpsonotus, and Archaeogaia Zimicz et al., 2020; trigonid proportionally less developed than in Othnielmarshia; and protolophid more oblique and entolophid less developed than in Archaeogaia. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Carroll 1988, Lillegraven 1979, Hendy et al. 2009, MacFadden et al. 1996 | |||||
Age range: Early/Lower Eocene or 55.80000 to 48.60000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Eocene | Brazil (Rio de Janeiro) | Nanolophodon tutuca (type locality: 118314) |