PBDB Collection

Río Chico Oeste: Lutetian - Bartonian, Argentina

List of taxa

Where & when

Geology

Taphonomy & methods

Metadata & references

Taxonomic list

Mammalia - Astrapotheria - Trigonostylopidae

	Trigonostylops wortmani Ameghino 1897

	Trigonostylops scabellum n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Trigonostylops wortmani
	MACN 10657, maxilla P3-4
Mammalia

	Carolozittelia tapiroides n. gen., n. sp. Ameghino 1901	Simpson 1967	2 specimens
	MACN 10666, maxilla M2-3 (lectotype), lower jaw fragments; MACN 10665, lower jaw fragments.
Mammalia - Notoungulata - Isotemnidae

	Isotemnus consummatus n. sp.	Simpson 1967	1 specimen
	MACN 10580, maxilla with broken P4-M3

	Isotemnus primitivus Ameghino 1897	Simpson 1967	1 specimen
	MACN 10598, dentary with m3 and partial m2, referred to _Eochalicotherium cretaceum_

	Isotemnus latidens (Ameghino 1901)

	Eochalicotherium crassidens n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Isotemnus latidens
	MACN 10601, dentary m2 and partial m1

	Isotemnus apicatus n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Isotemnus latidens
	MACN 10614, maxilla P3-M2

	Isotemnus enecatus n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Isotemnus latidens
	MACN 10587, maxilla P4-M3

	Eochalicotherium robustum n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Isotemnus latidens
	MACN 10594, dentary m?2 (lectotype), other specimens in same lot may not be conspecific

	Thomashuxleya externa Ameghino 1901

	Anisotemnus distentus (Ameghino 1901)

	Isotemnus lophiodontoides n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Anisotemnus distentus
	MACN 10615, broken M2 (type or lectotype), two broken P4s, three other tooth fragments

	Dialophus recticrista n. sp. Ameghino 1904	Simpson 1967	1 specimen
	recombined as Pleurostylodon recticrista
	MACN 10590, dentary with ?dp4 and ?m1

	Coelostylops crassus n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Pleurostylodon similis
	MACN 10476, right M3
Mammalia - Notoungulata - Notostylopidae

	Catastylops pendens n. sp. Ameghino 1901	Simpson 1948	1 specimen
	recombined as Notostylops pendens
	MACN 10472, crushed right maxilla with P3-M2

	Notostylops aspectans n. sp. Ameghino 1902	Simpson 1948	1 specimen
	synonym of Notostylops murinus
	MACN 10528, maxilla with M2-3 and broken M1, part of right dentary with broken m2

	Entelostylops tripartitus n. sp. Ameghino 1901	Simpson 1948	1 specimen
	synonym of Notostylops murinus
	MACN 10491, maxilla with parts of P3-M3
Mammalia - Notoungulata

	Antepithecus brachystephanus Ameghino 1901	Vera and Cerdeño 2014
	MACN-A 10827, 10842, 10857

	Gonopithecus trigodontoides n. sp.	Simpson 1967	4 specimens
	synonym of Notopithecus
	MACN 10827, three right upper molars and a right upper premolar

	Notopithecus adapinus Ameghino 1897

	Acoelodus connectus n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Transpithecus obtentus
	MACN 10747, dentary fragment with m1-3
Mammalia - Notoungulata - Henricosborniidae

	Othnielmarshia lacunifera n. gen., n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 10807, complete left M1 or M2 (lectotype), broken M1 or M2, fragment of M1 or M2. May not all be conspecific.

	Postpithecus curvicrista n. sp. Ameghino 1901	Simpson 1948	1 specimen
	recombined as Othnielmarshia curvicrista
	MACN 10806. "A number of isolated teeth, not associated and perhaps not all conspecific, including isolated left m1 or m2, isolated left m3, left m1 or m2 in fragment of jaw, and right m1 or m2 in fragment of jaw. The isolated m1 or m2 and m3 were later figured (Ameghino, 1906, fig. 77), but the type description was evidently based entirely on one tooth, a m1 or m2, and the measurements given are closer to those of the isolated m1 or m2 (not in jaw fragment) in the present lot of material. This is therefore designated lectotype."

	Postpithecus reflexus n. sp. Ameghino 1901	Simpson 1948	1 specimen
	recombined as Othnielmarshia reflexa
	MACN 10803. "Three fragmentary lower jaws, one with m1-2, one with p4-m1, and one with p3-4. They are not associated, and the last mentioned, at least, probably does not belong to this species, or indeed family. The type description was probably based entirely on the first specimen, with m1-2, and this was also figured. It is therefore the type or lectotype."

	Henricosbornia alouatina n. sp. Ameghino 1904	Simpson 1948	1 specimen
	synonym of Henricosbornia lophodonta
	MACN 10810, left M1 or M2

	Pantostylops incompletus n. sp. Ameghino 1901	Simpson 1948	1 specimen
	synonym of Henricosbornia lophodonta
	MACN 10707, left M3

	Selenoconus centralis n. sp. Ameghino 1901	Simpson 1948	4 specimens
	synonym of Henricosbornia lophodonta
	MACN 10797, left m2-3 (holotype or lectotype); unassociated m3, dm4, m3

	Henricosbornia subconica n. sp. Ameghino 1904	Chitaley 1949	1 specimen
	synonym of Henricosbornia lophodonta
	MACN 10809, left M3

	Polystylops progrediens n. sp. Ameghino 1904	Simpson 1948	1 specimen
	synonym of Henricosbornia lophodonta
	MACN 10708, left M3

	Selenoconus senex n. sp. Ameghino 1901	Simpson 1948	3 specimens
	synonym of Henricosbornia lophodonta
	MACN 10792, left m3 (lectotype), right m1 or m2, left m1 or m2

	Pantostylops typus n. sp. Ameghino 1901	Simpson 1948	4 specimens
	synonym of Henricosbornia lophodonta
	MACN 10717, left M1 or M2 (lectotype), right M1 or M2, two broken upper molars

	Polystylops amplus n. sp. Ameghino 1904	Simpson 1948	1 specimen
	recombined as Henricosbornia ampla
	MACN 10709, left M3

	Pantostylops minutus n. sp. Ameghino 1901	Simpson 1948	1 specimen
	recombined as Peripantostylops minutus
	MACN 10711, right M1 or M2

	Selenoconus agilis n. sp. Ameghino 1901	Simpson 1948	1 specimen
	synonym of Peripantostylops minutus
	MACN 10796, left dentary with m2-3 and broken m1
Mammalia - Notoungulata

	Pleurostylops glebosus n. gen., n. sp. (Ameghino 1901)	Simpson 1967	1 specimen
	nomen dubium belonging to Notoungulata
	MACN A55-5, broken upper molariform
Mammalia - Notoungulata - Archaeohyracidae

	Eohyrax rusticus n. sp. Ameghino 1901	Simpson 1967	5 specimens
	MACN 10775, five jaw fragments: p4-m2 (lectotype), m1-2, M1-3, P1-M2, M1-2
Mammalia - Notoungulata - Oldfieldthomasiidae

	Paginula parca n. gen., n. sp. Ameghino 1901	Simpson 1967	1 specimen
	MACN 10596, dentary fragment with m3 and partial m2

	Oldfieldthomasia debilitata (Ameghino 1901)	Simpson 1967	1 specimen
	original and current combination Acoelodus debilitatus
	MACN 10744, dentary m2-3

	Maxschlosseria praeterita n. sp. Ameghino 1901	Simpson 1967	1 specimen
	MACN 10624, maxilla P4-M3

	Antepithecus plexostephanos n. sp. Ameghino 1902	Simpson 1967	1 specimen
	synonym of Maxschlosseria praeterita
	MACN 10840, a M?2 (type or lectotype); ?dP4, partial upper molars under the same number may not be this species

	Maxschlosseria anatona n. sp. Ameghino 1902	Simpson 1967	1 specimen
	synonym of Maxschlosseria praeterita
	MACN 10617, maxilla with P4-M1 and partial M2-3

	Oldfieldthomasia septa n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Maxschlosseria praeterita
	MACN 10758, maxilla with three teeth (type); four isolated lower teeth

	Ultrapithecus rusticulus n. sp. Ameghino 1901	Simpson 1967	3 specimens
	synonym of Maxschlosseria praeterita
	MACN 10819, maxilla P4-M3 (type or lectotype), left P4-M3, left dentary m1-3

	Isotemnus emundatus n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Maxschlosseria praeterita
	MACN 10578, maxilla with P4 and broken M1-2

	Oldfieldthomasia marginalis n. sp. Ameghino 1901	Simpson 1967	3 specimens
	synonym of Maxschlosseria praeterita
	MACN 10751, maxilla P4-M2 (type), maxilla M1-2, mandible p2-m1. Other specimes under 10751 are probably not this species.

	Eochalicotherium minutum n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Maxschlosseria praeterita
	MACN 10595, dentary with roots of p4 and crowns of m1-2 (type)
Mammalia - Notoungulata - Archaeopithecidae

	Archaeopithecus rigidus n. sp. Ameghino 1901	Simpson 1967
	synonym of Archaeopithecus rogeri
	MACN 10813, nine specimens with 1-5 upper teeth each, including a left maxilla with P4-M2 (lectotype)

	Archaeopithecus alternans n. sp. Ameghino 1901	Simpson 1967	1 specimen
	synonym of Archaeopithecus rogeri
	MACN 10815, maxilla M1-3
Mammalia - Cingulata - Dasypodidae

	Utaetus laxus n. sp. Ameghino 1902	Simpson 1948	1 specimen
	synonym of Utaetus buccatus
	MACN 10424, two scutes. Locality record based on Simpson (1967, ref. 57943).
Mammalia - Panameriungulata - Proterotheriidae

	Josepholeidya adunca n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 10702, left upper molar
Mammalia - Panameriungulata - Macraucheniidae

	Ernestohaeckelia acutidens n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 10731, comprising a nearly complete upper molar (the lectotype) and four other molar fragments, some referable to other species

	Anisolambda longidens n. sp. Ameghino 1901	Simpson 1967
	recombined as Victorlemoinea longidens

	Victorlemoineia labyrinthica n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 10671, P4 and a third of M1

	Victorlemoineia emarginata n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 10672, nearly complete M1 and broken M2

	Amilnedwardsia brevicula n. sp. Ameghino 1901	Simpson 1948	1 specimen
	MACN 12011, upper molar
Mammalia - Panameriungulata - Didolodontidae

	Prohyracotherium medialis n. sp. Ameghino 1902	Simpson 1948	1 specimen
	recombined as Archaeohyracotherium mediale
	MACN 10677, left upper molar

	Didolodus multicuspis Ameghino 1897	Simpson 1948	1 specimen
	MACN 10728, right m3

	Nephacodus latigonus n. sp. Ameghino 1902	Simpson 1948	1 specimen
	synonym of Didolodus multicuspis
	MACN 10725, m2

	Enneoconus parvidens n. sp. Ameghino 1901	Simpson 1948	1 specimen
	synonym of Ernestokokenia nitida
	MACN 10726, M3
Reptilia - Sebecidae

	Sebecus sp. Stirton 1953	Colbert 1946	1 specimen
	MACN 10872, tooth. Identified by Ameghino as a dinosaur and by Simpson as possibly something like _Florentinoameghinia_ (Simpson, 1932, ref. 42601). Later identified as _Sebecus_.
see common names

Geography

Country:	Argentina	State/province:	Chubut
Coordinates:	45.1° South, 68.4° West (view map)
Paleocoordinates:	47.6° South, 58.7° West
Basis of coordinate:	based on political unit
Geographic resolution:	local area

Time

Period:	Paleogene	Epoch:	Eocene

Key time interval:	Lutetian - Bartonian	Zone:	Barrancan-Vacan
Age range of interval:	47.80000 - 37.71000 m.y. ago

Stratigraphy

Stratigraphy comments: Casamayoran SALMA. According to Cifelli (1985), this locality is mostly early Barrancan but partly Vacan in age.

Middle Eocene according to Woodburne et al. (2014).

Lithology and environment

Primary lithology:	not reported
Environment:	terrestrial indet.

Taphonomy

Modes of preservation:	body
Size of fossils:	mesofossils

Collection methods and comments

Reason for describing collection:

biostratigraphic analysis

Metadata

Also known as:	west of Río Chico
Database number:	176164
Authorizer:	J. Zijlstra, P. Mannion	Enterer:	J. Zijlstra, P. Mannion
Modifier:	M. Kouvari	Research group:	vertebrate
Created:	2016-01-30 17:28:47	Last modified:	2020-09-22 03:16:02
Access level:	the public	Released:	2016-01-30 17:28:47
Creative Commons license:	CC BY

Reference information

Primary reference:

57836.

R. Cifelli. 1985. Biostratigraphy of the Casamayoran, Early Eocene of Patagonia. American Museum Novitates 2820:1-26 [J. Zijlstra/J. Zijlstra]

Secondary references:

10809	ETE	S.D. Chitaley. 1949. Dadoxylon chandaensis sp. nov. from the District of Chanda,C.P. Journal of Indian Botanical Society 28:172-180 [A. Srivastava/A. Srivastava/A. Srivastava]
58289		E. H. Colbert. 1946. Sebecus, representative of a peculiar suborder of fossil Crocodilia from Patagonia. Bulletin of the American Museum of Natural History 87(4):221-270 [J. Zijlstra/J. Zijlstra]
42601		G. G. Simpson. 1932. The supposed association of dinosaurs with mammals of Tertiary type in Patagonia. American Museum Novitates 566:1-21 [M. Uhen/M. Uhen]
10369		G. G. Simpson. 1948. The beginning of the age of mammals in South America. Part I. Bulletin of the American Museum of Natural History 91:1-232 [D. Croft/D. Croft/R. Butler]
57943		G. G. Simpson. 1967. The Ameghinos' localities for early Cenozoic mammals in Patagonia. Bulletin of the Museum of Comparative Zoology 136:63-76 [J. Zijlstra/J. Zijlstra]
10312		G. G. Simpson. 1967. The beginning of the age of mammals in South America. Part II. Bulletin of the American Museum of Natural History 137:1-260 [D. Croft/D. Croft/K. Pino]
62645		B. Vera. 2013. Acoelodus connectus Ameghino, 1901, Sinónimo de Transpithecus obtentus Ameghino, 1901, “Notopithecinae” del Eoceno de Patagonia. Ameghiniana 50(5):535-540 [P. Mannion/P. Mannion]
62627		B. Vera and E. Cerdeño. 2014. Systematic revision of Antepithecus brachystephanus Ameghino, 1901, and dental eruption sequence in Eocene ‘‘notopithecines’’ (Notoungulata) from Patagonia. Geobios 47:165-181 [P. Mannion/P. Mannion]
10963		G.P. Wahlman. 1992. Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066(O):1-123 [P. Wagner/P. Wagner/E. Ito]