Deseadan of Patagonia: Deseadan, Argentina
collected by C. Ameghino

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Notoungulata - Archaeohyracidae
Archaeohyrax patagonicus n. gen., n. sp. Ameghino 1897
5 specimens
MACN A52-617, cranium and mandible, holotype; 624, dentary p3-m3; 627, ?M1; 619, M1 and M2. These specimens may come from Cabeza Blanca.
Mammalia - Notoungulata - Mesotheriidae
Trachytherus spegazzinianus n. gen., n. sp. Ameghino 1889
Billet et al. 2008 1 specimen
MACN A235, right maxillary and premaxillary with broken I1, P2-M2, broken M3, holotype; MLP 52-XI-2-1, left maxillary and premaxillary with I1, P2-M2, probably originally part of the same specimen. The holotype was said by Ameghino (1889) to have come from the province of Neuquén, but the specimen originally bore a label with the locality name Santa Cruz, and Reguero (1999) says it came from central Chubut. See Billet et al. (2008:173, 175)
Mammalia - Notoungulata
Prohegetotherium sculptum n. gen., n. sp. Ameghino 1897
2 specimens
MACN A52-443, maxilla P1-3, lectotype, and A52-444, maxilla P3-M2, paralectotype. Labelled as being from Mazarredo, Santa Cruz, but suggested to be from Cabeza Blanca.
Mammalia - Panameriungulata
Proadiantus gibbus n. sp. Ameghino 1901
Cifelli and Soria 1983 2 specimens
nomen vanum belonging to Litopterna
MACN A52-216, incisor or canine and partial left mandibular symphysis
Mammalia - Sparassodonta
Pharsophorus antiquus n. sp. (Ameghino 1894)
Forasiepi et al. 2015 1 specimen
recombined as Australohyaena antiqua
MACN A 52-532, right upper canine, holotype. Patterson & Marshall (1978) stated that it was from La Flecha, and the MACN catalogue suggests it is from Punta Nava.
Pharsophorus lacerans Ameghino 1897
Patterson and Marshall 1978 1 specimen
MACN 11653, dentary with p3, m2-4
Mammalia - Paucituberculata - Caenolestidae
Halmarhiphus guaraniticus n. sp. Ameghino 1899
Patterson and Marshall 1978 1 specimen
recombined as Pseudhalmarhiphus guaraniticus
Dentary with m1-2, type, now lost
see common names

Geography
Country:Argentina State/province:Chubut
Coordinates: 45.7° South, 68.7° West (view map)
Paleocoordinates:46.9° South, 61.2° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
10 m.y. bin:Cenozoic 4-5
Key time interval:Deseadan Mammal zone: Deseadan
Age range of interval:28.90000 - 20.90000 m.y. ago
Stratigraphy
Formation:Sarmiento
Stratigraphic resolution:bed
Stratigraphy comments: Unit 3 of the Upper Puesto Almendra Member at Gran Barranca, Chubut.

Deseadan SALMA, Late Oligocene (Woodburne et al. 2014).
Lithology and environment
Primary lithology: not reported
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection methods:survey of museum collection
Reason for describing collection:general faunal/floral analysis
Collectors:C. Ameghino
Metadata
Database number:176647
Authorizer:J. Zijlstra Enterer:J. Zijlstra
Modifier:M. Carrano Research group:vertebrate
Created:2016-02-21 20:55:23 Last modified:2017-11-08 17:04:52
Access level:the public Released:2016-02-21 20:55:23
Creative Commons license:CC BY
Reference information

Primary reference:
36444. F. Ameghino. 1897. Mammiféres crétacés de l’Argentine (Deuxième contribution à la connaissance de la fauna mammalogique de couches à Pyrotherium) [Cretaceous mammals of Argentina (second contribution to the knowledge of the mammalian fauna of the Pyrotherium Beds)]. Boletin Instituto Geografico Argentino 18(4–9):406-521 [M. Uhen/M. Uhen/M. Carrano]

Secondary references:

43122 G. Billet, C. Muizon, and B. Mamani-Quispe. 2008. Late Oligocene mesotheriids (Mammalia, Notoungulata) from Salla and Lacayani (Bolivia): implications for basal mesotheriid phylogeny and distribution. Zoological Journal of the Linnean Society 152:153-200 [C. Jaramillo/A. Cárdenas/K. Pino]
46251 G. Billet, B. Patterson, and C. Muizon. 2009. Craniodental anatomy of late Oligocene archaeohyracids (Notoungulata, Mammalia) from Bolivia and Argentina and new phylogenetic hypotheses. Zoological Journal of the Linnean Society 155:458-509 [C. Jaramillo/A. Cárdenas]
58245 R. L. Cifelli and M. F. Soria. 1983. Systematics of the Adianthidae (Litopterna, Mammalia). American Museum Novitates 2771:1-25 [J. Zijlstra/J. Zijlstra/J. Zijlstra]
58304 A. M. Forasiepi, M. J. Babot, and N. Zimicz. 2015. Australohyaena antiqua (Mammalia, Metatheria, Sparassodonta), a large predator from the Late Oligocene of Patagonia. Journal of Systematic Palaeontology 13(6):503-525 [J. Zijlstra/J. Zijlstra/P. Mannion]
61925% 33860B. Patterson and L. G. Marshall. 1978. The Deseadan, Early Oligocene, Marsupialia of South America. Fieldiana Geology 41(2):1-100 [J. Alroy/J. Wertheim/J. Wertheim]
16747 M. A. Reguero and E. Cerdeño. 2005. New late Oligocene Hegetotheriidae (Mammalia, Notoungulata) from Salla, Bolivia. Journal of Vertebrate Paleontology 25(3):674-684 [D. Croft/D. Croft]