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Micropternodus borealis

Mammalia - Micropternodontidae

Taxonomy
Micropternodus borealis was named by Matthew (1903). Its type specimen is AMNH 9602, a mandible (a lower jaw with p3-m3 and alveoli of the anterior teeth), and it is a 3D body fossil. Its type locality is Pipestone Springs, which is in a Chadronian terrestrial claystone in the Renova Formation of Montana. It is the type species of Micropternodus.

Synonymy list
YearName and author
1903Micropternodus borealis Matthew p. 204 fig. 3
1930Micropternodus borealis Hay p. 427
2022Micropternodus borealis Korth 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()
RankNameAuthor
infraorderCynodontia()
Mammaliamorpha
Mammaliaformes
classMammalia
Cladotheria
Zatheria
subclassTribosphenida()
subclassTheria
Eutheria()
Placentalia
Boreoeutheria
Laurasiatheria
Eulipotyphla
suborderSoricomorphaGregory 1910
superfamilySoricoideaGill 1872
familyMicropternodontidae
genusMicropternodus
speciesborealis

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.

Micropternodus borealis Matthew 1903
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Diagnosis
ReferenceDiagnosis
W. D. Matthew 1903Dentition /3.1.3.3. Molars somewhat like those of Centetes in composition, with high trigonid and small, low talonid. Trigonid very wide transversely with prd considerably overtopping pad and med. Talonid with sharp posterior margin and low median ridge. Molars and especially premolars, short, high, and recurved; p4 sub-molariform, with small anterior and internal trigonid cusps and strong basal heel. P1 much smaller and simpler, with small heel and no other accessory cusps. P2 is small and one-rooted, canine small, incisors small, subequal. No diastemata except a slight one behind p2. Jaw rather deep in front. Second molar slightly larger than the first, third much smaller.
Measurements
No measurements are available
Composition: phosphaticsubp
Environment: terrestrialsubc
Locomotion: actively mobilec
Life habit: scansorialsubc
Diet: insectivoresubc
Reproduction: viviparoussubc
Created: 2005-09-06 20:43:42
Modified: 2005-09-06 22:44:32
Source: subc = subclass, c = class, subp = subphylum
References: Lillegraven 1979, Ji et al. 2002, Carroll 1988, Hendy et al. 2009

Age range: Early/Lower Chadronian or 37.20000 to 33.90000 Ma

Collections (12 total)


Time interval Ma Country or state Original ID and collection number
Chadronian37.2 - 33.9USA (Montana) Micropternodus borealis (16959 16988 type locality: 17010)
Chadronian37.2 - 33.9USA (Nebraska) Micropternodus borealis (16917 16940 16941 17014)
Chadronian37.2 - 33.9USA (Wyoming) Micropternodus sp. (16920)
Chadronian37.2 - 33.9USA (North Dakota) Micropternodus borealis (16991)
Early/Lower Chadronian37.2 - 33.9USA (Montana) Micropternodus borealis (27245)
Late/Upper Chadronian37.2 - 33.9USA (Montana) Micropternodus borealis (17027)
Late/Upper Chadronian - Orellan37.2 - 33.3USA (Nebraska) Micropternodus borealis (230806)