Casamayoran of Patagonia: Casamayoran, Argentina
collected by Carlos Ameghino 1900

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Mammalia - Cingulata - Dasypodidae
Astegotherium dichotomus n. gen., n. sp. Ameghino 1902
Simpson 1948 1 specimen
corrected as Astegotherium dichotomum
MACN 10421, 21 scutes
Anteutatus lenis n. sp. Ameghino 1902
Simpson 1948 1 specimen
recombined as Utaetus lenis
MACN 10425, seven scutes
Mammalia - Astrapotheria - Trigonostylopidae
Hedralophus bicostatus n. gen., n. sp. Ameghino 1901
Simpson 1967 1 specimen
nomen dubium belonging to Trigonostylopidae
MACN 10938, P3 or P4 (lectotype); other referred material probably not conspecific
Albertogaudrya unica n. gen., n. sp. Ameghino 1901
Simpson 1967 2 specimens
MACN 12000, upper molar (lectotype), other associated teeth; fragments and an astragalus; MACN 12001, mandible with right p2-m3 and left p4-m3
Mammalia - Notoungulata
Adpithecus secans n. sp. Ameghino 1901
Simpson 1967 1 specimen
synonym of Notopithecus adapinus
MACN 10790, skull and jaws
Antepithecus gradatus n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Notopithecus adapinus
MACN 10828, two left upper molars and a maxillary fragment
Transpithecus obtentus Ameghino 1901
Vera 2012 2 specimens
MACN-A 10691a, maxillary M1-2; MACN-A 10691b, M1
Patriarchippus annectens n. gen., n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Transpithecus obtentus
MACN 10691, maxilla M1-2 (lectotype); unassociated M2
Pseudadiantus imperfectus n. sp. Ameghino 1901
Simpson 1967 1 specimen
synonym of Antepithecus brachystephanus
MACN 10669(b), dentary p1-2
Pseudadiantus secans n. sp. Ameghino 1901
Simpson 1967 1 specimen
synonym of Antepithecus brachystephanus
MACN 10669(a), dentary p2-3
Adpithecus reduncus n. sp. Ameghino 1902
Simpson 1967 2 specimens
synonym of Antepithecus brachystephanus
MACN 10858, dentary m2-3 (lectotype), dentary m1-2
Notopithecus summus n. sp. Ameghino 1897
1 specimen
nomen dubium belonging to Notoungulata
Type not relocated by Simpson (1967), a humerus
Mammalia - Notoungulata - Oldfieldthomasiidae
Pleurostylodon minimus n. sp. Ameghino 1897
Simpson 1967 2 specimens
synonym of Maxschlosseria praeterita
MACN 10572, left M2 (lectotype) and right M3
Infrapithecus expansus n. sp. Ameghino 1902
Simpson 1967 3 specimens
synonym of Maxschlosseria praeterita
MACN 10856, three unassociated lower jaws
Acoelodus microdon n. sp. Ameghino 1901
Simpson 1967 1 specimen
synonym of Paginula parca
MACN 10698, dentary p2-4
Mammalia - Notoungulata - Notostylopidae
Entelostylops cestillus n. sp. Ameghino 1901
Simpson 1948 1 specimen
nomen vanum belonging to Notostylops
Type not relocated. M1-3.
Notostylops escaridus n. sp. Ameghino 1901
Simpson 1948 2 specimens
synonym of Notostylops murinus
MACN 10510, skull fragments with upper cheek teeth (lectotype); MACN 10509, right dentary p2-m2
Anastylops vallatus n. gen., n. sp. Ameghino 1897
3 specimens
synonym of Notostylops murinus
MACN 10469, two upper premolars and an incisor
Notostylops complexus n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Notostylops murinus
Type not relocated. Referred: MACN 10532, left M1-3, isolated left M2 and M3
Dimerostephanos chicoensis n. sp. Ameghino 1902
Simpson 1948 5 specimens
synonym of Notostylops murinus
MACN 10647, right p3-4 (lectotype), m2, p1-2, p2, p3
Notostylops brachycephalus n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Notostylops murinus
MACN 10499, nearly perfect skull
Notostylops irregularis n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Notostylops murinus
MACN 10523, mandible with right i1-2, p2-m1, left i2 and p2-3
Pliostylops magnificus n. gen., n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Notostylops murinus
MACN 10486, left p4-m3
Edvardotrouessartia sola n. gen., n. sp. Ameghino 1901
Simpson 1948 1 specimen
Type not relocated. Right dentary with p2-m3.
Mammalia - Notoungulata - Henricosborniidae
Henricosbornia lophodonta n. gen., n. sp. Ameghino 1901
Simpson 1948 1 specimen
MACN 10808, maxillary with P3-M3; right lower jaw fragment with m2 and broken m1
Microstylops monoconus n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10713, right M1 or M2
Hemistylops paucicuspidatus n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10714, left M3
Pantostylops completus n. sp. Ameghino 1902
Simpson 1948 2 specimens
synonym of Henricosbornia lophodonta
MACN 10716, two right upper molars
Microstylops clarus n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10715, right M1 or M2
Prohyracotherium patagonicum n. sp. Ameghino 1902
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10675, left M1 or M2
Prohyracotherium matutinum n. sp. Ameghino 1902
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10676, left M1 or M2
Selenoconus spiculatus n. sp. Ameghino 1902
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10795, right m3
Hemistylops trigonostyloides n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Henricosbornia lophodonta
MACN 10710, broken right M3
Mammalia - Notoungulata
Acoelodus terminalis n. sp. Ameghino 1902
Simpson 1967 1 specimen
MACN 10755, M?1
Acoelodus oppositus n. sp. Ameghino 1897
Simpson 1967 1 specimen
MACN 10770, dentary fragment with p2-3 and part of p4. Original type but replaced by a neotype from Gran Barranca by Simpson (1967). Simpson (1970, ref. 57986) indicated that this action is invalid and that the original type remains valid.
Acoelodus debilitatus n. sp. Ameghino 1901
Simpson 1967 1 specimen
MACN 10376, skull, holotype; MACN 10400, partial skull
Lophiodonticulus retroversus n. sp. Ameghino 1902
Simpson 1967 1 specimen
nomen dubium belonging to Notoungulata
MACN 10636, dentary m1-2. Simpson (1967b, ref. 57943) listed the type locality as Río Chico Oeste, but Simpson (1967a, ref. 10312) records it as just 'Casamayoran ("Partie supérieure")'
Mammalia - Notoungulata - Isotemnidae
Prostylops typus n. gen., n. sp. Ameghino 1897
1 specimen
nomen dubium belonging to Isotemnus
Type not relocated by Simpson (1967), a broken right lower molar. Referred material from Gran Barranca is Isotemnus latidens.
Isotemnus cuspidatus n. sp. Ameghino 1901
Simpson 1967
synonym of Isotemnus latidens
Type not relocated by Simpson (1967)
Isotemnus primitivus n. gen., n. sp. Ameghino 1897
1 specimen
MACN 10556, maxilla P2-M3, type
Eochalicotherium cretaceum n. sp. Ameghino 1901
Simpson 1967
synonym of Isotemnus primitivus
Type not relocated by Simpson (1967)
Acoelohyrax coronatus n. gen., n. sp. Ameghino 1902
Simpson 1967 1 specimen
MACN 10781, left P4 (type or lectotype)
Pleurostylodon notabilis n. sp. Ameghino 1901
Simpson 1967
nomen dubium belonging to Pleurostylodon
No material relocated by Simpson (1967), but said to be from the Casamayoran.
Pleurostylodon bifidus n. sp. Ameghino 1904
Simpson 1967 1 specimen
nomen dubium belonging to Pleurostylodon
No material relocated by Simpson (1967), but said to be based on a partial dentary with teeth
Pleurostylodon complanatus n. sp. Ameghino 1902
Simpson 1967 3 specimens
MACN 10564, three upper molars, including the type
Pleurostylodon neglectus n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Pleurostylodon complanatus
MACN 10568, M3
Pleurostylodon irregularis n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Pleurostylodon complanatus
Type apparently the same specimen as _P. complanatus_. MACN 10575, isolated M3, was also referred.
Pleurostylodon modicus n. gen., n. sp. Ameghino 1897
1 specimen
MACN 10566, maxilla M1-3, type
Pleurostylodon limpidus n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Pleurostylodon modicus
MACN 10573, M3
Pleurostylodon plexus n. sp. Ameghino 1901
Simpson 1967 3 specimens
synonym of Pleurostylodon modicus
MACN 10570, right M1, left M1 (lectotype), and left M2
Pleurostylodon sinuosus n. sp. Ameghino 1902
Simpson 1967 1 specimen
synonym of Pleurostylodon modicus
MACN 10571, broken M1
Parastylops coelodus n. gen., n. sp. Ameghino 1897
4 specimens
synonym of Pleurostylodon modicus
MACN 10618, two upper and two lower molars, including left M3, lectotype
Pleurostylodon similis n. sp. Ameghino 1901
Simpson 1967 1 specimen
MACN 10549, maxilla P4-M3
Thomashuxleya principialis n. sp. Ameghino 1902
Simpson 1967 1 specimen
nomen dubium belonging to Isotemnidae
MACN 10937, dentary m2-3
Thomashuxleya rostrata n. gen., n. sp. Ameghino 1901
Simpson 1967 1 specimen
MACN 10370, mandible i2-p4 (lectotype) and maxilla I1-P4
Thomashuxleya robusta n. sp. Ameghino 1901
Simpson 1967
synonym of Thomashuxleya rostrata
Type not relocated by Simpson (1967), lower teeth
Thomashuxleya externa Ameghino 1901
Simpson 1967 3 specimens
MACN 10544, m1-3; MACN 10639; right p4-m2 and left m2-3; MACN 10543, teeth tooth fragments
Thomashuxleya artuata n. sp. Ameghino 1901
Simpson 1967 1 specimen
synonym of Thomashuxleya externa
MACN 10540, mandible with alveoli of c-p2, crowns of p3-m3
Mammalia - Notoungulata - Archaeopithecidae
Acropithecus tersus n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Archaeopithecus rogeri
MACN 10850, three upper teeth including the lectotype M?3
Mammalia - Notoungulata
Epitypotherium cancellatum n. gen., n. sp. Ameghino 1904
Simpson 1967 1 specimen
nomen dubium belonging to Notoungulata
MACN 10699, astragalus
Lophiodonticulus patagonicus n. gen., n. sp. Ameghino 1902
Simpson 1967 1 specimen
nomen dubium belonging to Notoungulata
MACN 10637, dentary m1-2. Simpson (1967b, ref. 57943) listed the type locality as Río Chico Oeste, but Simpson (1967a, ref. 10312) records it as just 'Casamayoran ("Partie supérieure")'
Mammalia - Panameriungulata - Proterotheriidae
Heterolambda lunulata n. gen., n. sp. Ameghino 1904
Simpson 1948 1 specimen
recombined as Ricardolydekkeria lunulata
Isolated upper cheek tooth. Lost, but cast preserved (AMNH 11876). Simpson (1967) relocated the holotype, MACN A55-4.
Ricardolydekkeria cinctula n. sp. Ameghino 1904
Simpson 1948 1 specimen
MACN 10705, right upper cheek tooth
Anisolambda fissidens n. sp. Ameghino 1901
Simpson 1948 2 specimens
MACN 10668, right m1-2 (lectotype) and left m1-2 of two individuals
Lambdaconus suinus n. gen., n. sp. Ameghino 1897
1 specimen
MACN 10718, dentary ?m2
Mammalia - Panameriungulata - Protolipternidae
Asmithwoodwardia subtrigona n. gen., n. sp. Ameghino 1901
Simpson 1948 1 specimen
MACN 10723, one upper molar (probably M2) and one lower molar (m1 or m2). Upper is the lectotype.
Mammalia - Panameriungulata - Macraucheniidae
Ernestohaeckelia aculeata n. gen., n. sp. Ameghino 1901
Simpson 1948 1 specimen
"Presumably an isolated upper molar. Not found."
Mammalia - Panameriungulata
Eolicaphrium primarium n. gen., n. sp. Ameghino 1902
Simpson 1948 1 specimen
Not found. Fragment of lower jaw with i1, i3; alveoli of i2, c, p1-2
Mammalia - Panameriungulata - Didolodontidae
Didolodus multicuspis n. sp. Ameghino 1897
Simpson 1948 1 specimen
MACN 10690, left maxilla with P2-M3
Didolodus crassicuspis n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Didolodus multicuspis
MACN 10689, right p2-m3
Didolodus dispar n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Didolodus multicuspis
MACN 10733, broken right M2
Argyrolambda conidens n. gen., n. sp. Ameghino 1904
Simpson 1967 1 specimen
synonym of Didolodus multicuspis
MACN A55-8, crown cap of a right upper molar
Ernestokokenia nitida n. sp. Ameghino 1901
Simpson 1948 1 specimen
MACN 10735, left m2 and broken left m3
Ernestokokenia marginata n. sp. Ameghino 1901
Simpson 1948 1 specimen
synonym of Ernestokokenia nitida
MACN 10722, left m1
Mammalia
Caroloameghinia tenuis n. sp. (Ameghino 1901)
Simpson 1948 1 specimen
MACN 10345, maxilla M1-4, holotype
Caroloameghinia mater n. gen., n. sp. Ameghino 1901
Simpson 1967 1 specimen
MACN A55-13, holotype, mandible
Odontomysops spiniferus n. gen., n. sp. Ameghino 1902
Simpson 1948 1 specimen
nomen vanum belonging to Marsupialia
"Upper incisor and fragment of lower jaw with incisor root, three alveoli, and an unerupted tooth. Present whereabouts of type unknown." Simpson (1967) relocated the types, MACN A55-2a (subconical tooth, canine or perhaps incisor), A55-2b, anterior fragment of left dentary with fragments of teeth), A55-2c (small lower jaw fragment). The specimens probably are not conspecific.
Mammalia - Sparassodonta
Argyrolestes peralestinus n. gen., n. sp. Ameghino 1902
Simpson 1948 1 specimen
MACN 10331, broken upper molar, holotype
Mammalia - Polydolopidae
Anadolops thylacoleoides n. gen., n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Amphidolops serrula
MACN 10339, mandible m2-4, holotype
Polydolops clavulus n. sp. Ameghino 1902
Simpson 1948 2 specimens
MACN 10356, mandible p3-m2, lectotype; MACN 10360, mandible m1-3
Polydolops serra n. sp. Ameghino 1902
Simpson 1948 1 specimen
MACN 10341, mandible with p3, m1, fragment of m2, lectotype
Polydolops thomasi Ameghino 1897
Simpson 1948 5 specimens
MACN 10337, mandible with p3-m4; MACN 10343, mandible with m3-4; from ref. 57557 (Marshall 1982): MACN 10350, 10351, 16382
Orthodolops sciurinus n. sp. Ameghino 1904
Simpson 1948 1 specimen
synonym of Polydolops thomasi
MACN 10336, mandible with broken p3-m2 and complete m3-4
Mammalia
Pachypithecus macrognathus n. gen., n. sp. Ameghino 1897
1 specimen
nomen dubium belonging to Mammalia
MACN 10817, edentulous mandible
Anisorhizus atriarius n. gen., n. sp. Ameghino 1902
Simpson 1967 1 specimen
nomen dubium belonging to Mammalia
MACN 10620, cheek tooth
Archaeorycteropus patagonicus n. sp. Ameghino 1905
Simpson 1948 1 specimen
nomen vanum belonging to Mammalia
Broken distal tibia, not found in Ameghino collection
Anagonia insulata n. gen., n. sp. Ameghino 1904
Simpson 1967 1 specimen
nomen dubium belonging to Mammalia
MACN 10635, ?p4
see common names

Geography
Country:Argentina State/province:Chubut
Coordinates: 45.7° South, 68.7° West (view map)
Paleocoordinates:48.2° South, 58.7° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Paleogene Epoch:Eocene
10 m.y. bin:Cenozoic 2
Key time interval:Casamayoran Mammal zone: Casamayoran
Age range of interval:55.80000 - 48.00000 m.y. ago
Stratigraphy
Stratigraphic resolution:bed
Stratigraphy comments: Vacan and Barrancan sub-ages of the Casamayoran SALMA, Middle to Late Eocene (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:taxonomic analysis
Collectors:Carlos Ameghino Collection dates:c. 1900
Metadata
Database number:176285
Authorizer:J. Zijlstra Enterer:J. Zijlstra
Modifier:M. Kouvari Research group:vertebrate
Created:2016-02-06 01:07:41 Last modified:2020-09-22 03:18:49
Access level:the public Released:2016-02-06 01:07:41
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:

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]
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]
58097 B. Vera. 2012. Revisión del género Transpithecus Ameghino, 1901 (Notoungulata, Interatheriidae) del Eoceno medio de Patagonia, Argentina. Ameghiniana 49(1):60-74 [J. Zijlstra/J. Zijlstra/J. Zijlstra]