| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Taxonomy
Acarechimys was named by Patterson (1965) [in Kraglievich 1965]. It is not extant.
It was assigned to Eumysopinae by Carvalho and Salles (2004); to Echimyidae by McKenna and Bell (1997) and Kramarz et al. (2010); to Octodontinae by Verzi et al. (2014); and to Octodontoidea by Kramarz (2004), Vucetich et al. (2010), Arnal and Vucetich (2015), Vucetich et al. (2015) and Vizcaíno et al. (2022).
It was assigned to Eumysopinae by Carvalho and Salles (2004); to Echimyidae by McKenna and Bell (1997) and Kramarz et al. (2010); to Octodontinae by Verzi et al. (2014); and to Octodontoidea by Kramarz (2004), Vucetich et al. (2010), Arnal and Vucetich (2015), Vucetich et al. (2015) and Vizcaíno et al. (2022).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1965 | Acarechimys Patterson |
| 1997 | Acarechimys McKenna and Bell |
| 2004 | Acarechimys Carvalho and Salles |
| 2004 | Acarechimys Kramarz p. 205 |
| 2010 | Acarechimys Kramarz et al. |
| 2010 | Acarechimys Vucetich et al. |
| 2014 | Acarechimys Verzi et al. |
| 2015 | Acarechimys Arnal and Vucetich |
| 2015 | Acarechimys Vucetich et al. |
| 2017 | Ameghinomys Verzi et al. |
| 2022 | Acarechimys Vizcaíno 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.
G. †Acarechimys Patterson 1965
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†Acarechimys constans Ameghino 1887
†Acarechimys gracilis Ameghino 1891
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Invalid names: Acarechimys pascuali Verzi et al. 2017 [objective synonym], Acarechimys pulchellus Ameghino 1902 [objective synonym]
†Acarechimys leucotheae Vucetich et al. 2015
†Acarechimys minutissimus Ameghino 1887
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Invalid names: Sciamys tenuissimus Ameghino 1894 [synonym], Stichomys diminutus Ameghino 1891 [synonym]
†Acarechimys minutus Patterson and Pascual 1967
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Invalid names: Acaremys minutus Ameghino 1887 [objective synonym]
Invalid names: Ameghinomys Verzi et al. 2017 [objective synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Vucetich et al. 2015 | Small-to-very small octodontoids. Higher crown molariforms than in Protacaremys. Evi- denced cusps and thin crests separated by wide flexi. Retention of the deciduous premolars. Upper molars with four straight crests; the antero- and posteroloph fused labially in juveniles with proto- and metaloph delimiting the para- and the posterofossette respectively. Lower molars with accessory cusp behind metalophulid I; metalophulid II variably developed: interrupted or absent on m1–m2, absent or interrupted on m3. Lower deciduous premolar with variably developed metalophulid II and mesolophid fused with the metaconid. Well-developed masseteric crest in the mandible and masseteric fossa anteriorly deep or very deep (Arnal 2012). |
Measurements
| part | N | mean | |||||
|---|---|---|---|---|---|---|---|
| Jaw at m1 height | 1 | 5.50 | |||||
| Lower m1 height | 1 | 0.180 | |||||
| Lower m2 height | 1 | 0.190 | |||||
| Lower m3 height | 1 | 0.240 |
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| Source: s = species, o = order, subc = subclass, c = class, subp = subphylum | |||||
| References: Ji et al. 2002, Lillegraven 1979, Hendy et al. 2009, Nowak 1999, Carroll 1988, Walton 1997 | |||||
Age range: base of the Aquitanian to the top of the Laventan or 23.03000 to 11.00000 Ma
Collections (43 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Deseadan | Argentina (Chubut) | A. leucotheae (14211) | |
| Aquitanian | Argentina | A. sp. (206766) | |
| Colhuehuapian | Argentina (Chubut) | A. minutissimus (27311) A. minutissimus, A. pulchellus (141368) | |
| Burdigalian | Argentina (Chubut) | A. sp. (176205) | |
| Burdigalian | Chile (Aisén) | A. constans, A. minutus, A. sp. (71843) | |
| Burdigalian | Argentina (Santa Cruz) | A. sp., A. minutissimus (59319) | |
| Burdigalian - Langhian | Argentina (Santa Cruz) | A. sp., A. minutissimus, A. minutus (197691) | |
| Santacrucian | Argentina (San Juan) | Ameghinomys constans (197900) | |
| Santacrucian | Argentina (Santa Cruz) | A. constans (142533) A. minutissimus (59324 59333 59334 176585 176601 210786) A. minutissimus, A. minutus (176571) A. minutissimus, A. minutus, A. gracilis (210637) A. minutissimus, Acaremys minutus, Stichomys constans, A. constans, A. gracilis (176593) A. minutus (176584 176596 176603 204202) A. sp., A. minutissimus, A. constans, A. minutus (27313) A. sp., A. minutissimus, A. constans, A. minutus, A. gracilis (210638) A. sp., A. minutissimus, Sciamys tenuissimus, Stichomys diminutus, A. constans, A. minutus, A. gracilis (176570) Ameghinomys constans, A. pascuali, A. minutus (176564 176622) | |
| Santacrucian | Chile | A. sp. (103804) | |
| Santacrucian - Friasian | Chile (Bío Bío) | A. sp. (140107) | |
| Friasian | Chile (Aisén) | A. sp. (139845) | |
| Langhian | Bolivia (Potosí) | A. sp. (68402) | |
| Langhian - Serravallian | Argentina (Chubut) | A. sp., A. minutus (215594 215595) | |
| Colloncuran | Argentina (Neuquén) | A. minutissimus (198564) A. sp., A. minutissimus, A. minutus (141175) | |
| Serravallian - Tortonian | Peru | A. sp. (176156) | |
| Laventan | Colombia (Huila) | A. minutissimus (186683 194496) | |
| Laventan | Peru (Ucayali) | A. sp. (163843) | |
| Laventan | Bolivia (Tarija) | A. sp. (133664) A. sp., A. minutissimus, A. minutus (38071) | |
| Tortonian | Peru | A. sp. (176133) |