Canadon Hondo, Kibenikhoria Faunal Zone (Eocene of Argentina)

Where: Chubut, Argentina (45.4° S, 67.7° W: paleocoordinates 47.9° S, 57.7° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Itaboraian mammal zone, Las Flores Formation (Rio Chico Group), Early/Lower Eocene (55.8 - 48.6 Ma)

• Kibenikhoria Faunal Zone of Simpson (1935), equivalent to the Las Flores Fm, Itaboraian SALMA, early Eocene (Woodburne et al. 2014).

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; medium-grained, coarse sandstone

Size classes: macrofossils, mesofossils

Collected by Piatnitzky, Scarritt Expedition, Feruglio in 1931; reposited in the AMNH

Primary reference: G. G. Simpson. 1935. Descriptions of the oldest known South American mammals, from the Rio Chico Formation. American Museum Novitates 793:1-25 [J. Alroy/J. Wertheim/J. Wertheim]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 14205: authorized by John Alroy, entered by Jill Wertheim on 23.05.2002, edited by Richard Butler, Terri Cleary and Jelle Zijlstra

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Squamata - Madtsoiidae
? Madtsoia sp.1 Simpson 1933 snake
MACN 18951, incomplete centrum from mid-trunk vert; UNPSJB-PV 477 to 479, three very fragmentary vertebral centra
Mammalia
 Notoungulata - Archaeopithecidae
Archaeopithecidae indet.3 Ameghino 1897 notoungulate
AMNH 28578
Archaeopithecidae indet.3 Ameghino 1897 notoungulate
Isolated teeth and jaw fragments
 Notoungulata - Isotemnidae
Isotemnidae indet. Ameghino 1897 notoungulate
Two teeth
? Isotemnus ctalego n. sp. Simpson 1935 notoungulate
AMNH 28568
 Notoungulata - Notostylopidae
? Notostylopidae indet. Ameghino 1897 notoungulate
AMNH 28556
 Notoungulata -
Seudenius cteronc n. gen. n. sp.
Seudenius cteronc n. gen. n. sp. Simpson 1935 notoungulate
AMNH 28538
 Notoungulata - Oldfieldthomasiidae
Kibenikhoria get n. gen. n. sp.
Kibenikhoria get n. gen. n. sp. Simpson 1935 notoungulate
AMNH 28542 (holotype). AMNH 28563 (paratype). AMNH 28544, 28548, 28543
 Notoungulata - Henricosborniidae
? Peripantostylops orehor n. sp. Simpson 1935 notoungulate
AMNH 28526 (holotype). AMNH 28555 (paratype)
Henricosbornia waitehor n. sp. Simpson 1935 notoungulate
AMNH 28530 (holotype)
 Ungulata - Didolodontidae
Ernestokokenia yirunhor n. sp. Simpson 1935 eutherian
AMNH 28539 (holotype)
 Ungulata -
? Litopterna indet. eutherian
AMNH 28572
 Ungulata - Trigonostylopidae
Shecenia ctirneru n. gen. n. sp.
Shecenia ctirneru n. gen. n. sp. Simpson 1935 eutherian
AMNH 28531
 Sparassodonta - Borhyaenidae
Borhyaenidae indet.2 Savage 1951 metatherian
AMNH 28532
 Polydolopimorphia - Polydolopidae
? Polydolops kamektsen n. sp. Simpson 1935 metatherian
AMNH 28525 (holotype)
 Theriiformes -
Gashternia ctalehor n. gen. n. sp.
Gashternia ctalehor n. gen. n. sp. Simpson 1935 marsupial
AMNH 28533 (holotype)