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Acarechimys minutissimus

Mammalia - Rodentia

Taxonomy
Acarechimys minutissimus was named by Ameghino (1887) [Type series. MACN-A 256, left mandible with dp4-m3; MACN-A 257, left mandible with dp4-m3; MACN-A 258, right mandible with incisor and dp4-m3; MLP 15-188, left mandible with dp4-m3. Lectotype. MLP 15-188 Patterson in Pascual, 1967 Paralectotypes. MACN-A 256, MACN-A 257, MACN-A 258. Referred material. (Supplementary appendix 1)]. Its type specimen is MLP 15-188, a mandible (left mandibular fragment bearing dp4-m3), and it is a 3D body fossil.

Sister species lacking formal opinion data
A. hunikuini

Synonyms
Synonymy list
YearName and author
1887Acarechimys minutissimus Ameghino
1891Stichomys diminutus Ameghino p. 14
1894Sciamys tenuissimus Ameghino p. 68
1894Stichomys diminutus Ameghino p. 70
2004Acarechimys minutissimus Kramarz p. 205
2010Acarechimys minutissimus Vucetich et al.
2022Acarechimys minutissimus Vizcaíno et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—EuarchontogliresMurphy et al. 2001
—GliriformesWyss and Meng 1996
—Glires()
—Simplicidentata()
orderRodentiaBowdich 1821
—CtenohystricaHuchon et al. 2000
infraorderHystricognathi(Tullberg 1899)
—Caviomorpha(Wood and Patterson 1955)
superfamilyOctodontoideaWaterhouse 1839
genusAcarechimysPatterson 1965
speciesminutissimusAmeghino 1887

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.

†Acarechimys minutissimus Ameghino 1887
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Invalid names: Sciamys tenuissimus Ameghino 1894 [synonym], Stichomys diminutus Ameghino 1891 [synonym]
Diagnosis
No diagnoses are available
Measurements
partNmean
Jaw at m1 height15.50
Lower m1 height10.180
Lower m2 height10.190
Lower m3 height10.240

Composition: phosphaticsubp
Maximum body mass: 150 gs
Minimum body mass: 90 gs
Body mass source: publisheds
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: ground dwellingo
Diet: herbivoreo
Reproduction: viviparoussubc
Comments: Based on visual comparisonss
Created: 2013-05-30 03:57:39
Modified: 2013-05-29 12:57:39
Source: s = species, o = order, subc = subclass, c = class, subp = subphylum
References: Walton 1997, Ji et al. 2002, Lillegraven 1979, Nowak 1999, Carroll 1988, Hendy et al. 2009

Age range: base of the Burdigalian to the top of the Laventan or 20.44000 to 11.00000 Ma

Collections (22 total)


Time interval Ma Country or state Original ID and collection number
Colhuehuapian21.0 - 17.5Argentina (Chubut) Acarechimys minutissimus (27311 141368)
Burdigalian20.44 - 15.97Chile (Aisén) Acarechimys minutus (71843)
Burdigalian20.44 - 15.97Argentina (Santa Cruz) Acarechimys minutissimus (59319)
Burdigalian - Langhian20.44 - 13.82Argentina (Santa Cruz) Acarechimys minutissimus (197691)
Santacrucian17.5 - 16.3Argentina (Santa Cruz) Acarechimys minutissimus (27313 59324 59333 59334 176571 176585 176593 176601 210637 210638 210786) Acarechimys minutissimus, Sciamys tenuissimus, Stichomys diminutus (176570)
Colloncuran15.5 - 13.8Argentina (Neuquén) Acarechimys minutissimus (141175 198564)
Laventan13.8 - 11.0Bolivia (Tarija) Acarechimys minutissimus (38071)
Laventan13.8 - 11.0Colombia (Huila) Acarechimys minutissimus (186683 194496)