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Megatherium urbinai

Mammalia - Megatheriidae

Taxonomy
Megatherium urbinai was named by Pujos and Salas (2004). It is considered to be a form taxon. Its type specimen is MUSM 15, a partial skeleton, and it is a 3D body fossil.

Sister species lacking formal opinion data
M. tarijensis, M. uquiensis

Synonymy list
YearName and author
2004Megatherium urbinai Pujos and Salas
2006Megatherium urbinai Pujos

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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()
RankNameAuthor
—Mammaliamorpha
—Mammaliaformes
classMammalia
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Americatheria
—Xenarthra()
infraorderPilosaFlower 1883
—Folivora
classEufolivoraDelsuc et al. 2001
superfamilyMegatherioideaGray 1821
—Megatheria
familyMegatheriidae()
subfamilyMegatheriinaeGill 1872
genusMegatheriumCuvier 1796
speciesurbinai

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.

†Megatherium urbinai Pujos and Salas 2004
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Diagnosis
ReferenceDiagnosis
F. Pujos and R. Salas 2004Medium-sized, gracile, Pleistocene megatheriine; MCC proportionately less massive and more elongated transversely than in M. americanum and M. tarijense; scaphoid facet of MCC reduced, oval-shaped; it lies at medial edge of the bone and does not contact McII facet; articular facets for McIII±V of unciform convex and contiguous, but without the prominent crests that delimit the articulations in M. americanum, M. tarijense, and M. elenense; lateral surface of femoral diaphysis nearly rectilinear; greater trochanter intermediate between M. americanum, M. altiplanicum, and M. sundti (high) and M. tarijense and M. medinae (low); tibia and ®bula slender, rectilinear without distal ankylosis (curved with partial distal ankylosis in M. tarijense, complete ankylosis in M. americanum); discoid facet of tibia anteroposteriorly directed (anterolaterally to posteromedially directed in M. tarijense and M. americanum); discoid facet of astragalus shorter than in M. tarijense; one-third of navicular facet lies above the discoid facet (the two facets are at same level in M.americanum, the position is intermediate in M.tarijense and M. medinae); ectocuneiform articulated with MtIII±IV (only with MtIII in other Megatherium species) and MtIV highly twisted about its long axis.