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Mammalia - Microbiotheria - Microbiotheriidae

Synonymy list
YearName and author
1887Microbiotheridae Ameghino
1891Microbiotheridae Ameghino p. 22
1894Microbiotheridae Ameghino p. 103
1897Microbiotheriidae Ameghino p. 501
1909Clenialitidae Ameghino p. 204
1982Microbiotheriidae Marshall
1991Microbiotheriidae Nowak
1994Microbiotheriidae Springer et al. p. 86
1997Microbiotheriidae McKenna and Bell
1999Microbiotheriidae Goin et al.
2006Microbiotheriidae Goin et al.
2010Microbiotheriidae Goin et al.
2011Microbiotheriidae Oliveira and Goin
2012Microbiotheriidae Abello et al.
2013Microbiotheriidae Goin and Abello

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EubilateriaAx 1987
phylumChordataHaeckel 1874
subclassDipnotetrapodomorpha(Nelson 2006)
subclassAmphibiosauriaKuhn 1967
AustralidelphiaSzalay 1982
orderMicrobiotheriaAmeghino 1899
familyMicrobiotheriidae(Ameghino 1887)
familyMicrobiotheriidae(Ameghino 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.

Fm. Microbiotheriidae Ameghino 1887
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G. †Clenia Ameghino 1904
Clenia brevis Goin et al. 2010
Clenia minuscula Ameghino 1904
Invalid names: Clenialites Ameghino 1906 [objective synonym]
G. Dromiciops Thomas 1894
Dromiciops australis Philippi 1893
Dromiciops gliroides Thomas 1894 [monito del monte]
G. †Eomicrobiotherium Marshall 1982
Eomicrobiotherium diluculum Chornogubsky et al. 2023
Eomicrobiotherium matutinum Goin et al. 2010
Eomicrobiotherium mykerum Goin and Abello 2013
G. †Khasia Marshall and de Muizon 1988
Khasia cordillerensis Marshall and de Muizon 1988
G. †Kirutherium Goin and Candela 2004
Kirutherium paititiensis Goin and Candela 2004
G. †Microbiotherium Ameghino 1887
Microbiotherium acicula Ameghino 1891
Invalid names: Prodidelphys obtusa Ameghino 1891 [synonym], Prodidelphys pavita Ameghino 1891 [synonym]
Microbiotherium patagonicum Ameghino 1887
Invalid names: Hadrorhynchus conspicuus Ameghino 1891 [synonym], Stylognathus diprotodontoides Ameghino 1891 [synonym]
Microbiotherium praecursor Ameghino 1898
Microbiotherium tehuelchum Ameghino 1887
Invalid names: Eodidelphys famula Ameghino 1891 [synonym], Eodidelphys fortis Ameghino 1891 [synonym], Hadrorhynchus tortor Ameghino 1891 [synonym], Hadrorhynchus torvus Ameghino 1891 [synonym], Halmarhiphus didelpoides Ameghino 1891 [synonym], Microbiotherium forticulum Ameghino 1891 [synonym], Phonocdromus patagonicus Ameghino 1894 [synonym]
Invalid names: Eodidelphys Ameghino 1891 [synonym], Hadrorhynchus Ameghino 1891 [synonym], Prodidelphys Ameghino 1891 [synonym], Proteodidelphys Ameghino 1898 [synonym], Stylognathus Ameghino 1891 [synonym]
G. †Mirandatherium Paula Couto 1952
Mirandatherium alipioi Paula Couto 1952
Invalid names: Mirandaia ribeiroi Paula Couto 1952 [replaced]
G. †Oligobiotherium Ameghino 1902
Oligobiotherium divisum Ameghino 1902
Invalid names: Microbiotherium hernandezi Simpson 1932 [synonym]
Invalid names: Microbiotheridion Ringuelet 1953 [synonym]
G. †Pachybiotherium Ameghino 1902
Pachybiotherium acclinum Ameghino 1902
Pachybiotherium illuminatum Goin et al. 2010
Pachybiotherium minor Goin 1997
Invalid names: Clenialitidae Ameghino 1909 [invalid subgroup], Microbiotheriinae Simpson 1929 [empty]
F. J. Goin et al. 1999Family Microbiotheriidae. The upper molars have a very reduced stylar shelf and cusps. The protocone is strong; the paracone and metacone are subequal in size and height. The preparacrista is very short and connected with the parastylar corner. The lower molars have a metaconid slightly displaced posteriorly, especially on ml-2. The anterior cingu- lum is vestigial or absent. The talonids are wide. The hypoconulid is small and not close to the entoconid but relatively separated from it.
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialc
Locomotion: actively mobilec
Life habit: scansorialf
Diet: insectivoref
Reproduction: viviparoussubc
Created: 2005-06-08 10:11:09
Modified: 2005-06-08 12:11:09
Source: f = family, subc = subclass, c = class, subp = subphylum
References: Nowak 1991, Hendy et al. 2009, Carroll 1988, Hopson 1973, Lillegraven 1979, Clemens 1979

Age range

Maximum range based only on fossils: base of the Danian to the top of the Laventan or 66.00000 to 11.00000 Ma
Minimum age of oldest fossil (stem group age): 61.6 Ma

Collections (35 total)

Time interval Ma Country or state Original ID and collection number
Danian66.0 - 61.6Bolivia (Mizque) Khasia cordillerensis (13501)
Ypresian56.0 - 47.8Antarctica Microbiotheriidae indet. (100414)
Ypresian56.0 - 47.8Argentina (Chubut) Mirandatherium sp. (133040)
Ypresian - Lutetian56.0 - 41.3Argentina (Chubut) Eomicrobiotherium diluculum (231392)
Early/Lower Eocene55.8 - 48.6Brazil (Rio de Janeiro) Microbiotheriidae indet., Mirandaia ribeiroi, Mirandatherium alipioi (118314)
Lutetian47.8 - 41.3Argentina (Chubut) M. Gen. et sp. indet. D, Eomicrobiotherium sp. (176059) M. gen. et sp. indet. E (133039)
Bartonian - Priabonian41.3 - 33.9Antarctica Microbiotheriidae indet. (31173)
Tinguirirican36.0 - 29.0Argentina (Chubut) Microbiotherium sp., Eomicrobiotherium matutinum, Clenia brevis (176200)
Rupelian33.9 - 28.1Peru (Departamento de Ucayali) Kirutherium paititiensis (149523)
Rupelian33.9 - 28.1Argentina (Chubut) Eomicrobiotherium matutinum (176201)
Late/Upper Oligocene28.4 - 23.03Peru (Loreto) Microbiotheriidae indet. (176147)
Aquitanian23.03 - 20.44Argentina Microbiotherium patagonicum (206766)
Early/Lower Miocene23.03 - 15.97Argentina (Chubut) Proteodidelphys praecursor (176669)
Colhuehuapian21.0 - 17.5Argentina (Chubut) Eomicrobiotherium mykerum (27311) Microbiotheriidae indet., Microbiotherium sp., Clenia minuscula, Pachybiotherium acclinum, Oligobiotherium divisus, Microbiotherium hernandezi, Eomicrobiotherium mykerum (141368)
Burdigalian20.44 - 15.97Argentina (Santa Cruz) Microbiotheriidae indet., Microbiotherium tehuelchum, Microbiotherium gallegosense, Microbiotherium divisum, Pachybiotherium illuminatum (59320) Microbiotherium divisum, Pachybiotherium illuminatum (59319) Microbiotherium tehuelchum, Microbiotherium divisum (59321)
Santacrucian17.5 - 16.3Argentina (Santa Cruz) Microbiotherium patagonicum (176575 176594 176601) Microbiotherium tehuelchum (27313 142533 176566 176571 176590 210638) Microbiotherium tehuelchum, Microbiotherium acicula, Microbiotherium gallegosense (87314) Microbiotherium tehuelchum, Microbiotherium patagonicum (176565 176593) Pachybiotherium illuminatum (59324) Phonocdromus patagonicus, Halmarhiphus didelpoides, Microbiotherium tehuelchum, Microbiotherium patagonicum, Microbiotherium forticulum, Stylognathus diprotodontoides, Eodidelphys fortis, Eodidelphys famula, Prodidelphys acicula, Prodidelphys pavita, Prodidelphys obtusa, Hadrorhynchus tortor, Hadrorhynchus torvus, Hadrorhynchus conspicuus (176570)
Friasian16.3 - 15.5Chile (Aisén) Microbiotherium tehuelchum (139845)
Laventan13.8 - 11.0Colombia Pachybiotherium minor (13749)