PBDB Collection

Monte León (Miocene of Argentina)

Where: Santa Cruz, Argentina (50.3° S, 68.9° W: paleocoordinates 50.9° S, 63.2° 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

Collected by C. Ameghino, Barnum Brown; reposited in the AMNH, MACN, MLP

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: taxonomic analysis

PaleoDB collection 176563: authorized by Jelle Zijlstra, entered by Jelle Zijlstra on 17.02.2016, edited by Miranta Kouvari and Grace Varnham

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Aves
Gruiformes - Phorusrhacidae	Phorusrhacos longissimus⁴, Psilopterus sp.⁴ Phorusrhacos longissimus⁴ Ameghino 1887 terror bird MNHN 1900-18-3, distal end of a large right tarsometatarsus Psilopterus sp.⁴ Moreno and Mercerat 1891 terror bird MNHN 1900-18-2, phalanx
Rheiformes - Rheidae	Opisthodactylus patagonicus⁴ Opisthodactylus patagonicus⁴ Ameghino 1891 rhea MNHN 1900-18-1, distal end of left tarsometatarsus
Reptilia
Squamata -	Dibolosodon typicus n. gen. n. sp.⁷, Diasemosaurus occidentalis n. gen. n. sp.⁷ Dibolosodon typicus n. gen. n. sp.⁷ Ameghino 1893 tegu MACN-A 621 Diasemosaurus occidentalis n. gen. n. sp.⁷ Ameghino 1893 tegu MACN-A 5806a-b
Mammalia
Cingulata - Chlamyphoridae	Stenotatus sp.¹² Stenotatus sp.¹² Ameghino 1891 edentate MLP 55-III-3-10, skull and mandible
Megatherioidea - Megalonychidae	Eucholoeops fronto⁶ Eucholoeops fronto⁶ Ameghino 1891 edentate MLP 4-2 (first identified by Lydekker as Eucholoeops ingens)
Rodentia -	Spaniomys sp.⁵ Spaniomys sp.⁵ Ameghino 1877 caviomorph MLP 55-XII-13–146 and MLP 84-III-1–36
Rodentia - Acaremyidae	Acaremys murinus² Acaremys murinus² Ameghino 1887 caviomorph MACN PV SC2339, SC2347, SC2410
Primates - Homunculidae	Homunculus patagonicus⁹ Homunculus patagonicus⁹ Ameghino 1891 monkey MLP 55-XII-13-156, m1 (m2 according to ref. 47173)
Sparassodonta -	"Cladosictis dissimilis n. sp." = Cladosictis patagonica¹⁰, "Hathliacynus fischeri n. sp." = Cladosictis patagonica¹⁰, "Agustylus primaevus n. sp." = Cladosictis patagonica¹⁰, "Pseudonotictis pusillus" = Pseudonotictis pusillus¹¹, "Hathliacynus kobyi n. sp." = Pseudonotictis pusillus¹⁰, Acyon tricuspidatus n. gen. n. sp.¹⁰, "Sipalocyon gracilis" = Sipalocyon gracilis¹⁰, "Thylacodictis exilis n. sp." = Sipalocyon gracilis¹⁰ "Cladosictis dissimilis n. sp." = Cladosictis patagonica¹⁰ Ameghino 1887 metatherian MLP 11-86, maxillary M2-4 "Hathliacynus fischeri n. sp." = Cladosictis patagonica¹⁰ Ameghino 1887 metatherian MLP 11-19, partial skull and mandibles "Agustylus primaevus n. sp." = Cladosictis patagonica¹⁰ Ameghino 1887 metatherian MLP 11-4, mandible c-m1, m3-4 "Pseudonotictis pusillus" = Pseudonotictis pusillus¹¹ Ameghino 1891 metatherian MLP 11-40, dentary m1 "Hathliacynus kobyi n. sp." = Pseudonotictis pusillus¹⁰ Ameghino 1891 metatherian MLP 11-26, jaws, skull fragments, postcrania Acyon tricuspidatus n. gen. n. sp.¹⁰ Ameghino 1887 metatherian MLP 11-64, dentary p3-m4, holotype "Sipalocyon gracilis" = Sipalocyon gracilis¹⁰ Ameghino 1887 metatherian MLP 11-22, dentary p3-m2; MLP 11-39, mandible left m1, right m1 "Thylacodictis exilis n. sp." = Sipalocyon gracilis¹⁰ Ameghino 1887 metatherian MLP 11-12, mandible m1-2
Sparassodonta - Borhyaenidae	Borhyaena tuberata¹¹, Arctodictis munizi n. gen. n. sp.⁸ Borhyaena tuberata¹¹ Ameghino 1887 metatherian Arctodictis munizi n. gen. n. sp.⁸ Mercerat 1891 metatherian MLP 11-85, holotype, left dentary with p1-m4 and right with p3
Paucituberculata - Palaeothentidae	Palaeothentes lemoinei¹, Palaeothentes intermedius¹, Palaeothentes pascuali³, Palaeothentes aratae¹, Palaeothentes minutus¹, Acdestis lemairei¹, "Acdestis owenii" = Acdestis oweni¹ Palaeothentes lemoinei¹ Ameghino 1887 marsupial Palaeothentes intermedius¹ Ameghino 1887 marsupial Palaeothentes pascuali³ Bown and Fleagle 1993 marsupial MACN SC numbers 2939, 2945 Palaeothentes aratae¹ Moreno 1882 marsupial Palaeothentes minutus¹ Ameghino 1887 marsupial Acdestis lemairei¹ Bown and Fleagle 1993 marsupial "Acdestis owenii" = Acdestis oweni¹ Ameghino 1887 marsupial

¹Abello et al. 2012; ²Arnal and Vucetich 2015; ³Bown and Fleagle 1993; ⁴Buffetaut 2014; ⁵Carvalho and Salles 2004; ⁶Dozo 1994; ⁷Fernicola and Albino 2012; ⁸Forasiepi et al. 2004; ⁹Kay et al. 2012; ¹⁰Marshall 1981; ¹¹Prevosti et al. 2012; ¹²Vizcaíno et al. 2012