Ergilin Dzo [AMNH] (Eocene of Mongolia)

Also known as Ergilin-Dzo; Promontory Bluff; Ergelyeen Dzo; Ardyn Obo

Where: Mongolia (43.4° N, 109.1° E: paleocoordinates 44.7° N, 104.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Ergilin Dzo Formation, Late/Upper Eocene (37.2 - 33.9 Ma)

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; poorly lithified, argillaceous sandstone

• "rather loose and slightly indurated sandstones and clayey sands of considerable variety of texture, quality, and color"

Size class: macrofossils

Collected by AMNH Central Asiatic Expedition in 1922-1923; reposited in the AMNH

Primary reference: W. D. Matthew and W. Granger. 1923. The fauna of the Ardyn Obo formation. American Museum Novitates 98:1-5 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 73781: authorized by John Alroy, entered by John Alroy on 28.06.2007, edited by Roger Benson, Philip Mannion and Terri Cleary

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Testudines - Trionychidae
Trionychidae indet. Gray 1825 softshell turtle
Two small incomplete plates represent a small trionychid
 Testudines - Pantestudinidae
"Testudo demissa n. sp." = Geochelone demissa4, "Testudo insolitus n. sp." = Geochelone insolitus, "Testudo kaiseni n. sp." = Indotestudo kaiseni4
"Testudo demissa n. sp." = Geochelone demissa4 Gilmore 1931 turtle
AMNH 6670, right xiphiplastral bone
"Testudo insolitus n. sp." = Geochelone insolitus Matthew and Granger 1923 turtle
AMNH 6275, parts of carapace and plastron of several individuals (cotypes); including AMNH 6350 (left hyo- and hypoplastron), 6353 (anterior median portion of the carapace), 6351 (anterior half of an articulated carapace and plastron)
"Testudo kaiseni n. sp." = Indotestudo kaiseni4 Gilmore 1931 turtle
AMNH 6352 (nearly complete carapace and plastron)
 Testudines - Panemydidae
Emydidae indet. Rafinesque 1815 turtle
AMNH 6605 complete nuchal bone of a small emydid with the rugose surface suggestive of Trachemys
 Eosuchia -
Lepidosauria indet.5 Haeckel 1866 lepidosaur
"Sauria undetermined": (No number), single thoracic vertebra
Mammalia
 Rodentia - Cylindrodontidae
Ardynomys olseni n. gen. n. sp.7, Ardynomys chihi n. sp.7
Ardynomys olseni n. gen. n. sp.7 Matthew and Granger 1925 rodent
AMNH 20368 - type
Ardynomys chihi n. sp.7 Matthew and Granger 1925 rodent
AMNH 20370 - type; paratype: AMNH 20371
 Lagomorpha - Leporidae
Desmatolagus ardynense n. sp.2 Burke 1941 rabbit
AMNH 20373 and 20374
 Perissodactyla - Chalicotheriidae
Schizotherium avitum n. sp. Matthew and Granger 1923 chalicothere
AMNH 19157 - type; referred material: AMNH 20384
Schizotherium avitum3 Matthew and Granger 1923 chalicothere
AMNH 20385
 Perissodactyla - Amynodontidae
"Cadurcotherium ardynense n. sp." = Cadurcodon ardynensis8
"Cadurcotherium ardynense n. sp." = Cadurcodon ardynensis8 Osborn 1924 odd-toed ungulate
 Perissodactyla - Hyracodontidae
Ardynia praecox n. gen. n. sp.
Ardynia praecox n. gen. n. sp. Matthew and Granger 1923 odd-toed ungulate
AMNH 19156 - type; referred material: AMNH 20358
 Perissodactyla - Tapiridae
Colodon inceptus n. sp.6, Paracolodon curtus n. gen. n. sp.6
Colodon inceptus n. sp.6 Matthew and Granger 1925 tapir
AMNH 20357 - type
Paracolodon curtus n. gen. n. sp.6 Matthew and Granger 1925 tapir
AMNH 20355 - type
 Ferae -
Carnivora indet.1 Bowditch 1821 carnivoran
"indeterminate... agrees with Cynodictis so far as it goes"
 Didymoconida -
Ardynictis furunculus n. gen. n. sp.7
Ardynictis furunculus n. gen. n. sp.7 Matthew and Granger 1925 eutherian
AMNH 20366 - type; paratype: AMNH 20365
 Ungulata - Anthracotheriidae
Anthracotheriidae indet. Leidy 1869 anthracothere
 Ungulata - Praetragulidae
"Lophiomeryx gobiae n. sp." = Praetragulus gobiae6
"Lophiomeryx gobiae n. sp." = Praetragulus gobiae6 Matthew and Granger 1925 ruminant
AMNH 20381 - type; referred material: AMNH 20379-20380
 Ungulata - Lophiomerycidae
Lophiomeryx angarae n. sp.6 Matthew and Granger 1925 ruminant
AMNH 20376 - type; referred material: AMNH 20387
 Ungulata - Cervidae
Eumeryx sp. Matthew and Granger 1924 deer
 Ungulata - Archaeomerycidae
Miomeryx altaicus n. gen. n. sp.6
Miomeryx altaicus n. gen. n. sp.6 Matthew and Granger 1925 ruminant
AMNH 20383 - type
 Hyaenodonta - Hyaenodontidae
Hyaenodon eminus n. sp.7 Matthew and Granger 1925 eutherian
AMNH 20362 - type; paratype: AMNH 20363 and 20364