Proteodidelphys Fauna (Miocene of Argentina)

Also known as Lower Chubut Valley

Where: Chubut, Argentina (42.8° S, 65.9° W: paleocoordinates 43.5° S, 59.8° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Early/Lower Miocene (23.0 - 16.0 Ma)

• A small collection collected by Nicolas Illin in the lower Chubut Valley, supposedly from the Cretaceous. There is no evidence for a Cretaceous age of the collection, and the main species from the fauna, _Proteodidelphys praecursor_, is very similar to Early Miocene species of _Microbiotherium_.

•"Proteodidelphys Fauna" and which proves to be of highly dubious origin and not separable from a species of relatively late (Santa Cruz, probably lowest Miocene) age (see Simpson 1932a).

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Collected by Nicolás Illin; reposited in the MACN

Primary reference: G. G. Simpson. 1932. The supposed occurrences of Mesozoic mammals in South America. American Museum Novitates 530:1-9 [J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 176669: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 25.02.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Vertebrata indet. Lamarck 1801
MACN 10800, fragmentary dermal scute that could be an armadillo, reptile, or fish
 Microbiotheria - Microbiotheriidae
"Proteodidelphys praecursor n. gen. n. sp." = Microbiotherium praecursor
"Proteodidelphys praecursor n. gen. n. sp." = Microbiotherium praecursor Ameghino 1898 marsupial
MACN 10799, dentary i3-m4, type. See also ref. 57760.
 Placentalia -
cf. Litopterna indet. placental
Associated with the _Archaeoplus incipiens_ type.
 Theriamorpha -
Xenarthra indet. edentate
MACN 10798, broken tooth
 Notoungulata -
Archaeoplus incipiens n. gen. n. sp.
Archaeoplus incipiens n. gen. n. sp. Ameghino 1898 notoungulate
MACN 10801, incisor. It is a notoungulate, perhaps an archaeohyracid.