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Microbiotherium tehuelchum Ameghino 1887 (marsupial)

Osteichthyes - Microbiotheria - Microbiotheriidae

PaleoDB taxon number: 244512

Synonyms: Eodidelphys famula Ameghino 1891 (no. 244519), Eodidelphys fortis Ameghino 1891 (no. 244518), Hadrorhynchus tortor Ameghino 1891 (no. 244525), Hadrorhynchus torvus Ameghino 1891 (no. 244526), Halmarhiphus didelphoides Ameghino 1891 (no. 313134), Halmarhiphus didelpoides Ameghino 1891 (no. 243815), Microbiotherium forticulum Ameghino 1891 (no. 244514), Phonocdromus patagonicus Ameghino 1894 (no. 243809)

Belongs to Microbiotherium according to L. Marshall 1982

Sister taxa: Microbiotherium acicula, Microbiotherium gallegosense, Microbiotherium patagonicum, Microbiotherium praecursor

Type specimens:

  • Microbiotherium tehuelchum: MLP 11-36, a mandible (nearly complete right mandibular ramus with p2-m4 complete). Its type locality is Santa Cruz Formation, which is in a Miocene terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Eodidelphys famula: MACN 5732, a mandible (right mandibular ramus with p1-m4 and alveoli of all other teeth). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Eodidelphys fortis: MACN 5729, a mandible (left mandibular ramus with alveoli of i1-c1 and p1-m4 complete). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Hadrorhynchus tortor: MACN 5738, a mandible (fragment of right mandibular ramus with alveoli of i1-c, roots of p1-2, p3 complete, and alveoli of m1-2). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Hadrorhynchus torvus: MACN 5739, a mandible (fragment of right mandibular ramus with alveoli of c, roots of p1, p2-3 complete, and alveoli of m1). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Halmarhiphus didelpoides: MACN 5716, a mandible (fragment of a right mandibular ramus with m1-2 complete, and roots of m3-4). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Microbiotherium forticulum: MACN 5725, a mandible (fragment of left mandibular ramus with alveoli of c and m2, and p1-m1 complete). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.
  • Phonocdromus patagonicus: MACN 5741, a mandible (left mandibular ramus with partial dentition). Its type locality is Cerro Observatorio, which is in a Santacrucian terrestrial horizon in the Santa Cruz Formation of Argentina.

Ecology: scansorial insectivore

Average measurements (in mm): p3 1.30 x 0.80, m2 1.97 x 1.33, m3 1.95 x 1.45, m4 1.90 x 1.23, m5 1.45 x 0.95

Estimated body mass: 56.4 g based on m2 length, m2 width, m3 length, m3 width, m4 length, and m4 width