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Taxonomy
Panamacebus transitus was named by Bloch et al. (2016). Its type specimen is UF 280128, a tooth (left upper first molar ), and it is a 3D body fossil. Its type locality is Lirio Norte (Las Cascadas Fm), which is in an Arikareean terrestrial tuff in the Las Cascadas Formation of Panama. It is the type species of Panamacebus.
Synonymy list
| Year | Name and author |
|---|---|
| 2016 | Panamacebus transitus Bloch 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.
†Panamacebus transitus Bloch et al. 2016
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. I. Bloch et al. 2016 | Medium-sized cebid platyrrhine (~2.7kg) that differs from all other cebines in having lower incisors (I1, I2) that are higher crowned with an incomplete lingual cingulum, and a first upper molar (M1) that is considerably larger than the second upper molar (M2). Further differs from most cebines: (except Aotus) in having an I1 cross-sectional area only somewhat smaller than that of I2; (except Cebus) in having somewhat inflated lower premolars (P2, P4), and a P4 talonid and trigonid of similar length; and (except Saimiri and Neosaimiri) in having M1,2 with a short and strong anterior cingulum. Further differs: from Cebus and Acrecebus in having M1,2 with a mesiobuccally oriented prehypocrista, lacking a metaconule, a postprotocrista that is continuous with a hypometacrista that reaches to the base of the metacone, a sharp and distinct hypometacrista, and lack of lingual inflation of the protocone; from Cebus in having a P4 with a smaller hypoconid; and from Saimiri in lacking a pericone on M1,2. Differs from all callitrichines in having a discrete entoconid on P4, and M1,2 with a large hypocone and lacking a buccal cingulum; from callitrichines (but also Aotus) in having an M2 with a buccally expanded paracone; and from callitrichines (but also Saimiri and Neosaimiri) in having M1,2 with a well-developed prehypocrista that extends to the postprotocrista and encloses the talon lingually. For additional description and metrics see Extended Data Figs 4–7 and Supplementary Information (results section). |
Measurements
No measurements are available
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Lillegraven 1979, Carroll 1988, Nowak 1991, Hendy et al. 2009, Ji et al. 2002 | |||||
Age range: Arikareean or 29.50000 to 18.50000 Ma
Collections: one only
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Arikareean | Panama (Panama) | Panamacebus transitus (type locality: 152378) |