Río Gallegos (Miocene of Argentina)

Also known as Killik Aike, Río Gallegos

Where: Santa Cruz, Argentina (51.6° S, 69.4° W: paleocoordinates 52.2° S, 63.7° W)

• coordinate stated in text

• local area-level geographic resolution

When: Santa Cruz Formation, Santacrucian (17.5 - 16.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Primary reference: S. F. Vizcaíno, R. F. Kay, and M. S. Bargo. 2012. Background for a paleoecological study of the Santa Cruz Formation (late Early Miocene) on the Atlantic Coast of Patagonia. In S. F. Vizcaí­no, R. F. Kay, M. S. Bargo (eds.), Early Miocene Paleobiology in Patagonia: High-Latitude Paleocommunities of the Santa Cruz Formation 1-22 [J. Zijlstra/J. Zijlstra/J. Zijlstra]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 176590: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 17.02.2016, edited by Grace Varnham and Miranta Kouvari

Creative Commons license: CC BY (attribution)

Taxonomic list

 Anseriformes -
Brontornis burmeisteri2 Moreno and Mercerat 1891 waterfowl
 Sparassodonta -
Sipalocyon gracilis11 Ameghino 1887 metatherian
YPM-VPPU 153737 ("Killik Aike")
Cladosictis patagonica8 Ameghino 1887 metatherian
MACN 705, left maxillary P3-M2, isolated ?P2, C fragments ("Río Gallegos")
 Paucituberculata - Palaeothentidae
Palaeothentes intermedius5 Ameghino 1887 marsupial
Palaeothentes minutus1 Ameghino 1887 marsupial
coll. B. Brown ("Río Gallegos"), H. Felton ("Killik-Aike"): MACn-A 5619-5639a-I, dentaries and postcrania
Palaeothentes aratae1 Moreno 1882 marsupial
coll. B. Brown
Acdestis oweni5 Ameghino 1887 marsupial
 Microbiotheria - Microbiotheriidae
Microbiotherium tehuelchum1 Ameghino 1887 marsupial
coll. H. Felton ("Killik-Aike")
 Cingulata - Chlamyphoridae
Prozaedyus exilis13 Ameghino 1887 edentate
YPM-VPPU 15579, skull and postskeleton
 Theriamorpha -
Adiastaltus habilis9 Ameghino 1893 edentate
MACN A-5801, distal humerus
Stegotherium tauberi13 Gonzalez and Scilalto-Yané 2008 edentate
YPM-VPPU 15565, skull, vertebrae, pes, carapace
 Megatherioidea -
"Hapalops rectangularis n. sp." = Schismotherium rectangularis4
"Hapalops rectangularis n. sp." = Schismotherium rectangularis4 Ameghino 1887 edentate
AMNH 9222, mandible and postcrania, holotype
 Megatherioidea - Megatheriidae
Prepotherium potens4 Ameghino 1891 edentate
YPM-VPPU 15345, postcrania ("Killik Aike")
 Megatherioidea - Megalonychidae
Megalonychidae indet.4 Gervais 1855 edentate
AMNH 94754, postcrania ("Río Gallegos")
Hapalops sp.4 Ameghino 1887 edentate
YPM-VPPU 15618, postcrania ("Killik Aike")
Hapalops elongatus4 Ameghino 1891 edentate
YPM-VPPU 15597, skull and mandible ("Killik Aike")
 Panameriungulata - Proterotheriidae
Thoatherium minusculum7 Ameghino 1887 placental
YPM PU 15721
Tetramerorhinus sp.7 Ameghino 1894 placental
YPM PU 15368
Tetramerorhinus lucarius6 Ameghino 1894 placental
YPM-VPPU 15722, mandible ("Killik Aike, Río Gallegos")
Tetramerorhinus cingulatum6 Ameghino 1891 placental
YPM-VPPU 15436, mandible ("Killik Aike, Río Gallegos"); 15732, mandible ("Río Gallegos")
"Anisolophus australis" = Proterotherium australe6 Burmeister 1879 placental
YPM-VPPU 15368, cranium ("Killik Aike, Río Gallegos")
 Primates - Homunculidae
Homunculus patagonicus10 Ameghino 1891 monkey
The holotype of H. patagonicus (MACN-A 634) was collected by Carlos Ameghino from the north shore of the estuary of the Rio Gallegos but got lost.
 Rodentia - Acaremyidae
Pseudoacaremys kramarzi3 Arnal and Vucetich 2015 caviomorph
YPM PU 15872, maxillaries ("Killik-Aike")
Acaremys major n. sp.3 Scott 1905 caviomorph
YPM PU15366, skull ("Killik-Aike")
 Notoungulata - Hegetotheriidae
Hegetotherium mirabile6 Ameghino 1887 notoungulate
YPM-VPPU 15431, femur, tibia; 15542, cranium, mandible, humerus, ulna ("Killik AIke, Río Gallegos")
Pachyrukhos moyani6 Ameghino 1885 notoungulate
YPM-VPPU 15743, cranium; 15744, cranium, mandible ("Killik Aike, Río Galllegos")
 Notoungulata - Interatheriidae
Protypotherium cavum12, Protypotherium australe6, "Protypotherium attenuatum" = Protypotherium praerutilum6, "Interatherium robustum" = Interatherium extensus6
Protypotherium cavum12 notoungulate
AMNH 9245. endocraneum studied also by Simpson 1933 and Radinsky 1981
Protypotherium australe6 Moreno 1882 notoungulate
AMNH 9565, cranium and mandible ("Río Gallegos"); YPM-VPPU 15340, femur, tibia; 15659, femur, tibia; 15828, cranium, mandible, humerus, ulna; 15892, humerus ("Killik Aike, Río Gallegos")
"Protypotherium attenuatum" = Protypotherium praerutilum6 Ameghino 1887 notoungulate
YPM-VPPU 15341, postcrania; 15665, cranium ("Killik Aike, Río Gallegos")
"Interatherium robustum" = Interatherium extensus6 Fernández et al. 2023 notoungulate
AMNH 9483, mandible
 Notoungulata - Toxodontidae
Adinotherium ovinum6 Owen 1846 notoungulate
AMNH 9571, cranium
Nesodon sp.6 Owen 1846 notoungulate
AMNH 9168, cranium, mandible; 9553, ulna, tibia ("Río Gallegos")
 Astrapotheria - Astrapotheriidae
Astrapotherium magnum6 Owen 1853 placental
AMNH 9278, cranium and mandible