Barrancas del Río Santa Cruz (Miocene of Argentina)

Also known as Río Santa Cruz

Where: Santa Cruz, Argentina (50.1° S, 70.4° W: paleocoordinates 50.7° S, 64.8° W)

• coordinate based on political unit

• 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

Collected by C. Ameghino

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 176593: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 17.02.2016, edited by Grace Varnham, Miranta Kouvari and Kateryn Pino

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Microbiotheria - Microbiotheriidae
Microbiotherium tehuelchum11 Ameghino 1887 marsupial
Original type series, now lost
Microbiotherium patagonicum n. gen. n. sp.11 Ameghino 1887 marsupial
MLP 11-30, right dentary m1-4
 Sparassodonta -
Lycopsis torresi n. gen. n. sp.9
Lycopsis torresi n. gen. n. sp.9 Cabrera 1927 metatherian
MLP 11-113, partial skull, holotype
 Sparassodonta - Borhyaenidae
Borhyaena tuberata14 Ameghino 1887 metatherian
Acrocyon sectorius14 Ameghino 1887 metatherian
MLP 11-70
 Sparassodonta -
Acyon tricuspidatus14, "Cladosictis patagonica n. gen. n. sp." = Cladosictis patagonica10, "Agustylus cynoides n. sp." = Cladosictis patagonica10, "Sipalocyon gracilis" = Sipalocyon gracilis10, "Hathliacynus lynchi n. sp." = Sipalocyon gracilis10
Acyon tricuspidatus14 Ameghino 1887 metatherian
"Cladosictis patagonica n. gen. n. sp." = Cladosictis patagonica10 Ameghino 1887 metatherian
MLP 11-103, left maxillary fragment with M3-4
"Agustylus cynoides n. sp." = Cladosictis patagonica10 Ameghino 1887 metatherian
MLP 11-78, dentary p2
"Sipalocyon gracilis" = Sipalocyon gracilis10 Ameghino 1887 metatherian
MLP 11-25, dentary p3, m2-4
"Hathliacynus lynchi n. sp." = Sipalocyon gracilis10 Ameghino 1887 metatherian
MLP 11-7, dentary m1-4
 Notoungulata - Interatheriidae
Protypotherium claudum6 Ameghino 1889 notoungulate
 Notoungulata - Toxodontidae
"Protoxodon marmoratus n. sp." = Nesodon imbricatus5
"Protoxodon marmoratus n. sp." = Nesodon imbricatus5 Owen 1846 notoungulate
MLP 12-250, mandible
 Cingulata - Peltephilidae
Peltephilus strepens15 Ameghino 1887 edentate
MACN-A 771, osteoderms
Peltephilus pumilus15 Ameghino 1887 edentate
MACN-A 866–870, osteoderms
 Theriamorpha -
"Stegotherium tessellatum" = Stegotherium tesselatum15, Stegotherium simplex7
"Stegotherium tessellatum" = Stegotherium tesselatum15 Ameghino 1887 edentate
MACN-A 781–785, osteoderms
Stegotherium simplex7 Ameghino 1887 edentate
 Primates - Homunculidae
"Ecphantodon ceboides" = Homunculus patagonicus8
"Ecphantodon ceboides" = Homunculus patagonicus8 Ameghino 1891 monkey
 Rodentia -
Steiromys detentus12 Ameghino 1887 caviomorph
Steiromys duplicatus12 Ameghino 1887 caviomorph
 Rodentia - Eocardiidae
Phanomys mixtus n. gen. n. sp.13, Phanomys vetulus n. sp.13, "Eocardia fissa" = Dicardia fissa12, Schistomys erro12
Phanomys mixtus n. gen. n. sp.13 Ameghino 1887 caviomorph
MACN A 11302, maxilla fragment, "lectotype"; MACN A 2022, isolated cheek teeth, "neosyntype"
Phanomys vetulus n. sp.13 Ameghino 1891 caviomorph
MACN A 2024
"Eocardia fissa" = Dicardia fissa12 Ameghino 1891 caviomorph
Schistomys erro12 Ameghino 1887 caviomorph
 Rodentia -
Neoreomys australis12 Ameghino 1887 caviomorph
Eocardia excavata12 Ameghino 1891 caviomorph
Eocardia montana12 Ameghino 1887 caviomorph
 Rodentia - Chinchillidae
Prolagostomus pusillus12 Ameghino 1887 chinchilid
Pliolagostomus notatus n. sp.16 Ameghino 1887 chinchilid
Holotype: MLP 15-18 and other MLP specimens
 Rodentia - Neoepiblemidae
Perimys onustus12 Ameghino 1887 caviomorph
Perimys erutus12 Ameghino 1887 caviomorph
Perimys zonatus12 Ameghino 1887 caviomorph
Perimys incavatus12 Ameghino 1902 caviomorph
 Rodentia - Dinomyidae
Scleromys angustus12 Ameghino 1887 caviomorph
 Rodentia -
Stichomys sp.4 Ameghino 1887 caviomorph
MLP 15–144, MLP 15–199, MLP 15–209, MLP 15–210, MLP 15–211, MLP 15– 212, MLP 15–230a, MLP 15–283 (lectotype of S. regularis), MLP 15–311, MLP 15–320, MLP 15– 338, MLP 15–340, MLP 15–348, MLP 15–351a, MLP 15–351b, MLP 15–374, MLP 52-IX-27–21, MLP 63- XII-19–25/29, MLP 63-XII-19–109, MLP 63-XII-19– 111, MLP 63-XII-19–112 and MLP 63-XII-19–113
Stichomys regularis12 Ameghino 1887 caviomorph
Acarechimys minutissimus3 Ameghino 1887 caviomorph
MLP 15-188 (syntype of Acaremys minutissimus)
"Acaremys minutus" = Acarechimys gracilis3 Ameghino 1891 caviomorph
MLP 15-410a (syntype of Acaremys minutus)
 Rodentia - Octodontidae
Sciamys sp.4 Ameghino 1887 caviomorph
MLP 63-XII-19–126, MLP 63- XII-19–127, MLP 63-XII-19–130 and MLP 15–24 (lectotype of S. varians), MLP 15–25, MLP 15–146 (lectotype of S. principalis), MLP 15–197, MLP 15– 218, MLP 15–222, MLP 15–349 and MLP 15–352
Sciamys latidens12 caviomorph
Sciamys principalis1 Ameghino 1887 caviomorph
MLP 63-XII-19-127, mandible
 Rodentia - Acaremyidae
Pseudoacaremys kramarzi2 Arnal and Vucetich 2015 caviomorph
MLP 15-197a, maxilla P4-M1
Acaremys messor n. sp.2 Ameghino 1889 caviomorph
MACN A 4106, mandible dp4-m3, holotype
Acaremys murinus2 Ameghino 1887 caviomorph
MACN A 249, 266, MLP 15-410
Acaremys tricarinatus2 Ameghino 1894 caviomorph
MLP 15-24
 Rodentia -
Spaniomys sp.4 Ameghino 1877 caviomorph
MLP 15–19 (paratype of S. riparius), MLP 15–58a, MLP 15–80 (paratype of S. riparius), MLP 15–211, MLP 15–297, MLP 15–301, MLP 15–318, MLP 15–321, MLP 15–322, MLP 15– 324, MLP 15–351, MLP 15–401, MLP 15–402, MLP 61-VIII-3–408, MLP 62-XII-19–119, MLP 63-XII-19– 72, MLP 63-XII-19–73, MLP 63-XII-19–74, MLP 63- XII-19–75, MLP 63-XII-19–76, MLP 63-XII-19–78, MLP 63-XII-19–82 and MLP 63-XII-19–95
Spaniomys riparius12 Ameghino 1887 caviomorph
Spaniomys modestus12 Ameghino 1887 caviomorph
Adelphomys sp.4 Ameghino 1887 caviomorph
MLP 15–183, MLP 15–221, MLP 15–216 (lectotype of A. candidus), MLP 15–300, MLP 63-XII-19–104, MLP 63-XII-19–105, MLP 63- XII-19–107 and MLP 63-XII-19–108
Adelphomys candidus12 Ameghino 1887 caviomorph
 Rodentia - Abrocomidae
"Stichomys constans" = Ameghinomys constans3, "Acarechimys constans" = Ameghinomys constans3
"Stichomys constans" = Ameghinomys constans3 Ameghino 1887 chinchilla rat
MLP 15-200 (syntype of Stichomys constans) MLP 15-39 (syntype of Stichomys constans)
"Acarechimys constans" = Ameghinomys constans3 Ameghino 1887 chinchilla rat
MLP 15-319 MPM-PV 17430 MPM-PV 17431 MPM-PV 17432 MPM-PV 17433 MPM-PV 17434 MPM-PV 17439 MLP 15-188a MLP 15-398 MLP 15-408 MPM-PV 15098