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Nuciruptor rubricae
Taxonomy
Nuciruptor rubricae was named by Meldrum and Kay (1997) [Type specimen. IGM 251074 (Duke University field no. 90-23), a mandible, preserving the fused symphysis, right corpus and portions of the ascending ramus, left I1, and right C1–M2.
Etymology. From the Latin rubrica, meaning ‘‘red earth,’’ with reference to the red sediments of the El Cardon Red Beds.]. Its type specimen is IGM 251074, a mandible (mandible, preserving the fused symphysis, right corpus and portions of the ascending ramus, left I1, and right C1–M2.), and it is a 3D body fossil. It is the type species of Nuciruptor.
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Nuciruptor rubricae Meldrum and Kay |
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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.
†Nuciruptor rubricae Meldrum and Kay 1997
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D. J. Meldrum and R. F. Kay 1997 | A Pithecia-sized platyrrhine sharing with the living Pitheciini styliform, moderately high-crowned mandibular incisors; molars having trigonids and talonids of similar height, shallow hypoflexids and reduced posterior trigonid walls. Distinct from, and more primitive than, living Pitheciini in lacking an enlarged P2; lacking molarization of P3–4; in having weak hypoconids on P3–4 (versus strong, large hypoconids), and in lacking premolar and molar enamel crenulation. In these features, Nuciruptor compares favorably with Callicebus. Distinct from living pitheciins and Cebupithecia in having no
incisor-canine diastema, in possessing a canine with a rounded lingual crest and a well-developed heel, and in having molars lacking buccal cingulum, and mandible with a more acute symphyseal angle and rudimentary genial fossa. Nuciruptor is also distinguished from Cebupithecia by having a much larger alveolus for M3, implying reduction of the third mandibular molar in Cebupithecia, but not in Nuciruptor. Nuciruptor differs from Callicebus by having higher-crowned incisors, a more project ing canine, and less trenchant premolar and molar cresting. Nuciruptor differs from Mohanamico in having a posteriorly deepening mandible, more compressed and highercrowned incisors, and more bunodont molars. Nuciruptor is distinguished from Soriacebus in having a proportionately much smaller I1, canine, and P2, compared with molar size. |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| Depth at p2 height | 1 | 13.0 | |||||
| Lower c1 height | 1 | 6.46 | |||||
| Lower i1 height | 1 | 5.92 | |||||
| Lower m1 height | 1 | 2.60 | |||||
| Lower m2 height | 1 | 2.50 | |||||
| Lower p2 height | 1 | 3.82 | |||||
| Lower p3 height | 1 | 3.04 | |||||
| Lower p4 height | 1 | 2.78 |
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| Source: s = species, subc = subclass, c = class, subp = subphylum | |||||
| References: Carroll 1988, Hendy et al. 2009, Ji et al. 2002, Lillegraven 1979, Meldrum and Kay 1997 | |||||