La Flecha ( of Argentina)

Also known as Deseado, La Flexa, Cerro Ameghino, Cerro Morado; Piso Pyrotheriense

Where: Santa Cruz, Argentina (47.9° S, 66.3° W: paleocoordinates 49.0° S, 58.5° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Deseado Formation, Deseadan (29.0 - 21.0 Ma)

• "Pyrotherium" beds

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; mudstone

Size class: macrofossils

Collected by Carlos Ameghino

Primary reference: A. Tournouër. 1903. Note sur la géologie et la paléontologie de la Patagonie. Bulletin de la Société Géologique de France 3:464-473 [J. Alroy/J. Wertheim/J. Wertheim]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 50074: authorized by John Alroy, entered by Jill Wertheim on 05.05.2005, edited by Jelle Zijlstra, Philip Mannion, Grace Varnham and Kateryn Pino

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Aves
 Gruiformes - Phorusrhacidae
Physornis fortis1, "Psilopterus cf. affinis" = Phororhacos affinis3
Physornis fortis1 Ameghino 1894 terror bird
"Psilopterus cf. affinis" = Phororhacos affinis3 Ameghino 1899 terror bird
MNHN 1903-3, proximal part of right femur
Mammalia
 Paucituberculata - Palaeothentidae
Palaeothentidae indet.6
Palaeothentidae indet.6 Sinclair 1906 marsupial
MNHN DES 166, dentary partial m3, m1-4
 Sparassodonta -
cf. Sallacyon hoffstetteri8
cf. Sallacyon hoffstetteri8 Villarroel and Marshall 1982 metatherian
MNHN DES 168, partial m3; DES 167, M3
 Sparassodonta - Borhyaenidae
Australohyaena antiqua5
Australohyaena antiqua5 Ameghino 1894 metatherian
FMNH P13633, lower canine crown. The holotype, MACN A 52-532, was said to be from here by Patterson and Marshall (1978), but that is not certain.
 Cingulata - Chlamyphoridae
Prozaedyus aff. impressus4, Stenotatus aff. ornatus4
 Cingulata - Dasypodidae
Meteutatus aff. lagenaformis4, Archaeutatus malaspinensis4
Meteutatus aff. lagenaformis4 Ameghino 1897 armadillo
Archaeutatus malaspinensis4 Ameghino 1902 armadillo
  - Mylodontidae
Octodontotherium sp.
Octodontotherium sp. Ameghino 1894 edentate
 Astrapotheria - Astrapotheriidae
Astrapotherium sp., Parastrapotherium holmbergi n. gen. n. sp.7, Liarthrus copei n. gen. n. sp.7
Astrapotherium sp. Burmeister 1879 placental
Parastrapotherium holmbergi n. gen. n. sp.7 Ameghino 1894 placental
Syntypes: MACN A 52-509, 52-504, 52-515, 52-502, 52-518
Liarthrus copei n. gen. n. sp.7 Ameghino 1894 placental
MACN A 52-406 - holotype
 Tribosphenida - Pyrotheridae
"Pyrotherium romeri" = Pyrotherium romerii9
"Pyrotherium romeri" = Pyrotherium romerii9 Ameghino 1888 placental
 Notoungulata - Homalodotheriidae
Asmodeus osborni17
Asmodeus osborni17 Ameghino 1894 notoungulate
CNHM 15061 came from the matrix surrounding a femur of _Asmodeus osborni_
 Notoungulata - Isotemnidae
Trimerostephanos sp.
Trimerostephanos sp. Ameghino 1895 notoungulate
 Notoungulata - Notohippidae
Coresodon sp.
Coresodon sp. notoungulate
 Notoungulata -
Argyrohippus praecox10, Morphippus imbricatus13
Argyrohippus praecox10 Patterson 1935 notoungulate
Holotype: FMNH P13834, Incomplete palate with P2-M3 and alveolus of P1 and the root of the canine, LM1-3; horizontal ramus of left mandible with P2-M3 and alveoli of anterior teeth
Morphippus imbricatus13 Ameghino 1897 notoungulate
MACN A 52-56, a mandible
 Notoungulata - Leontiniidae
Leontinia sp., "Leontinia garzoni n. sp." = Ancylocoelus frequens12, "Ancylocoelus minor n. sp." = Ancylocoelus frequens12
Leontinia sp. Ameghino 1895 notoungulate
"Leontinia garzoni n. sp." = Ancylocoelus frequens12 Ameghino 1894 notoungulate
MACN A52-599, MACN A52-600bis
"Ancylocoelus minor n. sp." = Ancylocoelus frequens12 Ameghino 1894 notoungulate
MACN A52-551, right maxillary fragment with M2-3; left M3
 Notoungulata - Toxodontidae
Nesodon sp.
Nesodon sp. Owen 1846 notoungulate
 Notoungulata - Homalodontotheridae
Homalodontotherium sp.
Homalodontotherium sp. Huxley 1870 notoungulate
 Notoungulata - Archaeohyracidae
Archaeohyrax patagonicus11
Archaeohyrax patagonicus11 Ameghino 1897 notoungulate
 Notoungulata - Mesotheriidae
"Proedium solitarium n. gen. n. sp." = Trachytherus spegazzinianus2
"Proedium solitarium n. gen. n. sp." = Trachytherus spegazzinianus2 Ameghino 1889 notoungulate
MACN A52-495, symphysis without teeth, type
 Notoungulata - Hegetotheriidae
Hegetotherium sp.
Hegetotherium sp. Ameghino 1887 notoungulate
 Notoungulata - Interatheriidae
"Plagiarthrus cliva n. gen. n. sp." = Argyrohyrax proavus14, "Argyrohyrax proavunculus" = Argyrohyrax proavus14, Progaleopithecus tournoueri14
"Plagiarthrus cliva n. gen. n. sp." = Argyrohyrax proavus14 Ameghino 1897 notoungulate
MACN A52-470 - holotype
"Argyrohyrax proavunculus" = Argyrohyrax proavus14 Ameghino 1897 notoungulate
MACN A52
Progaleopithecus tournoueri14 Ameghino 1904 notoungulate
MACN A52-479c and 481; FMNH 13337
 Panameriungulata - Proterotheriidae
Deuterotherium sp.
Deuterotherium sp. Ameghino 1895 placental
 Rodentia - Cephalomyidae
Litodontomys chubutensis16, "Cephalomys arcidens" = Cephalomys arcidens17, "Cephalomys plexus" = Cephalomys arcidens17
Litodontomys chubutensis16 Loomis 1914 caviomorph
"Cephalomys arcidens" = Cephalomys arcidens17 Ameghino 1897 caviomorph
in MNHN
"Cephalomys plexus" = Cephalomys arcidens17 Ameghino 1897 caviomorph
in MNHN
 Rodentia - Chinchillidae
Scotamys antiquus17
Scotamys antiquus17 Loomis 1914 chinchilid
Isolated teeth in MNHN: 3 P4, 15 M1 or M2, 3 M3, 3 p4, 9 m1 or m2, 1 m3, 11 incisors
 Rodentia - Erethizontidae
Protosteiromys asmeodeophilus n. sp.17, "Eosteiromys medianus n. sp." = Protosteiromys medianus17, "Protosteiromys medianus" = Protosteiromys medianus16
Protosteiromys asmeodeophilus n. sp.17 porcupine
CNHM 15061, m1 or m2; MNHN 1903-3-18, ?m3
"Eosteiromys medianus n. sp." = Protosteiromys medianus17 Ameghino 1903 porcupine
MACN A52-111, M1 or M2, type; MNHN 1903-3-83, M1 or M2; 1903-3-84, broken M1 or M2; 1903-3-15, M3; 1903-3-16, m1 or m2; 1903-3-17, m1 or m2; 1903-3-85, m1 or m2
"Protosteiromys medianus" = Protosteiromys medianus16 Ameghino 1903 porcupine
 Rodentia -
Deseadomys arambourgi n. gen. n. sp.17, Chubutomys simpsoni15
Deseadomys arambourgi n. gen. n. sp.17 Wood and Patterson 1959 caviomorph
MNHN 1903-3-1, dentary p4-m3, type
Chubutomys simpsoni15 Wood and Patterson 1959 caviomorph
1Alvarenga and Holfing 2003; 2Billet et al. 2008; 3Buffetaut 2014; 4Carlini et al. 2009; 5Forasiepi et al. 2015; 6Goin et al. 2007; 7Kramarz and Bond 2008; 8Marshall et al. 1984; 9Pascual et al. 2002; 10Patterson 1935; 11Reguero and Prevosti 2010; 12Ribeiro et al. 2010; 13Shockey 1997; 14Vera et al. 2017; 15Vucetich et al. 2015; 16Vucetich et al. 2014; 17Wood and Patterson 1959