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Metacaremys
Emended diagnosis. Octodontoid larger than Neophanomys, Acaremys minutissimus Ameghino, 1887 and Acarechimys leucotheae. Cranium with the tip of the lateral process of the supraoccipital dorsal to the mastoid process. Mandible proportionally lower than that of Neophanomys, with the chin process slightly more posterior than in A. minutissimus, at the level of the anterior part of the dp4. Masseteric crest descending from he posterior part of the notch for the tendon of m. masseter medialis, pars infraorbitalis. Notch subhorizontal. Lateral crest straight, descending toward the masseteric notch following the same direction as the anterior margin of coronoid apophysis. Lower incisor very slender, with enamel more labially extended than in A. minutissimus and Neophanomys. Fourth deciduous molars (DP4/dp4) functional throughout life. Upper molars tetralophodont, with the mesoflexus/fossette more persistent and wider than the paraflexus/fossette and metaflexus/fossette. Mesolophule originated from the mure, and with its labial end joined to the medial wall of the metacone area in M12. DP4 with the mesolophule not reduced. Juvenile dp4 pentalophodont, with a principal oblique spur of the metalophulid II, and the mesolophid anterolingually oriented; adult dp4 bilobed or suboval. m13 trilophodont in non-senile specimens; atypically, remnant tetralophodonty in m1; m12 with protoconid and hypoconid areas labially extended and acuminate, and mesoflexid more persistent than metaflexid. LSID. urn:lsid:zoobank.org:act:56D865C2-81BC-4F74-9778-0C507 877D7EB
It was assigned to Octodontidae by Piñero et al. (2021).
| Year | Name and author |
|---|---|
| 2021 | Metacaremys Piñero 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.
| Reference | Diagnosis | |
|---|---|---|
| P. Piñero et al. 2021 | Emended diagnosis. Octodontoid larger than Neophanomys, Acaremys minutissimus Ameghino, 1887 and ‘Acarechimys’ leucotheae. Cranium with the tip of the lateral process of the supraoccipital dorsal to the mastoid process. Mandible proportionally lower than that of Neophanomys, with the chin process slightly more posterior than in A. minutissimus, at the level of the anterior part of the dp4. Masseteric crest descending from the posterior part of the notch for the tendon of m. masseter medialis, pars infraorbitalis. Notch subhorizontal. Lateral crest straight, descending toward the masseteric notch following the same direction as the anterior margin of coronoid apophysis. Lower incisor very slender, with enamel more labially extended than in A. minutissimus and Neophanomys. Fourth deciduous molars (DP4/dp4) functional throughout life. Upper molars tetralophodont, with the mesoflexus/fossette more persistent and wider than the paraflexus/fossette and metaflexus/fossette. Mesolophule originated from the mure, and with its labial end joined to the medial wall of the metacone area in M1–2. DP4 with the mesolophule not reduced. Juvenile dp4 pentalophodont, with a principal oblique spur of the metalophulid II, and the mesolophid anterolingually oriented; adult dp4 bilobed or suboval. m1–3 trilophodont in non-senile specimens; atypically, remnant tetralophodonty in m1; m1–2 with protoconid and hypoconid areas labially extended and acuminate, and mesoflexid more persistent than metaflexid. |
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| Source: f = family, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Nowak 1991, Carroll 1988, Lillegraven 1979, Hendy et al. 2009 | |||||
Age range: base of the Chasicoan to the top of the Late/Upper Miocene or 10.00000 to 5.33300 Ma
Collections (18 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Late/Upper Miocene | Argentina (Mendoza) | M. calfucalel (230710) | |
| Chasicoan | Argentina (Buenos Aires) | Cercomys primitiva, Chasicomys cangapoli, Chasichimys bonaerense (140913) | |
| Chasicoan | Argentina (La Pampa) | M. primitiva (230708 230709) | |
| Chasicoan | Argentina (San Juan) | M. primitiva (167887) | |
| Huayquerian | Argentina (La Pampa) | Cercomys primitiva, M. primitiva (152063) M. calfucalel (140925 151500 152061 192135 204363 206031) M. dimi (204361) M. primitiva (151498) | |
| Huayquerian | Bolivia (Chuquisaca) | Sciamys sp. (68792) | |
| Huayquerian | Argentina (La Rioja) | Octodontidae indet. (151506) | |
| Huayquerian | Argentina (Buenos Aires) | M. dimi (198862) | |
| Huayquerian | Argentina (Mendoza) | M. calfucalel (231327) |