| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Chachapoyamys was named by Boivin et al. (2021). Its type is Chachapoyamys kathetos.
It was assigned to Caviomorpha by Boivin et al. (2021).
It was assigned to Caviomorpha by Boivin et al. (2021).
Species
C. kathetos (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2021 | Chachapoyamys Boivin 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 | |
|---|---|---|
| M. Boivin et al. 2021 | Small-sized rodent characterized by brachydont, bunolophodont and non-taeniodont teeth. p4s and lower molars with a short posterior arm of the metaconid and a dis- continuity of the metalophulid I, which can generate a wide notch. Oval P4s with a third crest connected to the meso- style and anterior arm of the hypocone, and the presence of a metaloph. Transverse lower and upper molars. M1–2s with an absent or strongly reduced metaloph lingually free or completely isolated on the posterior flexus. M3s with an absent or short metaloph lingually free. Accessory, thin and short enamel structures (posteroloph spur included) almost always present between the third crest and the posteroloph on dP4s and upper molars, and connected to either or both transverse crests on upper molars. Differs from Cachiyacuy contamanensis, Eobranisamys, Eosallamys paulacoutoi, and ‘Eosallamys’ simpsoni in having a smaller size; from Balsayacuy, Cachiyacuy, Canaanimys, Eobranisamys, Eoespina, Eosachacui, Es. paulacoutoi, ‘Es.’ simpsoni, and Pozomys in having more transverse lower molars; and from Balsayacuy, Cachiyacuy, Eobranisamys, Eoespina, Eosachacui, Es. paulacoutoi, ‘Es.’ simpsoni, and Pozomys in having more transverse upper molars. Differs from Balsay- acuy, Eobranisamys, Canaanimys, and Pozomys in having teeth always non-taeniodont. Differs from Pozomys in having a curved (i.e., mesially concave) second cristid on p4s; from Eoespina, Eosachacui, Es. paulacoutoi, and some p4s of Cc. contamanensis in being devoid of accessory cristulids (mesolophid included) on the anteroflexid and/or mesoflexid on p4s; from Cachiyacuy, Eoespina, Es. paulacoutoi, and ‘Es.’ simpsoni in having a more important discontinuity of the metalophulid I on p4s; from Balsayacuy, Cachiyacuy, Canaanimys, Eobranisamys, Eoespina, Eosachacui, Es.
paulacoutoi, and ‘Es.’ simpsoni in having lower molars, which can have a more important discontinuity of the met- alophulid I; from Balsayacuy in having a shorter anterior arm of the metaconid on lower molars, and oval P4s with a third crest connected to the mesostyle and the presence of a metaloph; from Balsayacuy and Es. paulacoutoi in hav- ing P4s with a oblique lingual protoloph; from Balsayacuy and Eobranisamys in having P4s with a paracone, which remains separate from the mesostyle at a moderate stage of wear; from Eosachacui and ‘Es.’ simpsoni in having a metaloph on P4s; from Eosachacui in having non-taeniodont P4s; from Eobranisamys and Eosachacui in having P4s with a complete mure; from Eoespina in having P4s with always a third crest connected to the mesostyle; from Eobranisamys and ‘Es.’ simpsoni in having a reduced metaloph discon- nected to the posteroloph on dP4s; from Eosachacui in hav- ing a relictual metaloph on the posterior flexus on dP4s; and from Balsayacuy, Cachiyacuy kummeli, Eobranisamys, Eoespina, and Pozomys in having some upper molars with more important developed accessory structures between the third crest and the posteroloph, which connect both crests. The metaloph is absent or reduced to a very short crest lin- gually free on M1–2s of Chachapoyamys, differing from the most frequent morphology of this crest in Cachiyacuy con- tamanensis, Canaanimys, and Eobranisamys, in which the metaloph is longer. Differs from Es. paulacoutoi in having a metaloph (when present) more reduced and isolated on the posterior flexus on M1s, a shorter metaloph lingually free on M2s and lingually free (when present) on M3s.. |
Measurements
No measurements are available
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| Source: o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Hendy et al. 2009, Nowak 1999, Lillegraven 1979, Carroll 1988, Ji et al. 2002 | |||||
Age range: Late/Upper Eocene or 37.20000 to 33.90000 Ma
Collections (3 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Priabonian - Rupelian | Peru (Loreto) | C. kathetos (144474) | |
| Late/Upper Eocene | Peru | C. kathetos (207066 207067) |