Monte Tigre (Estancia La Costa) (Miocene of Argentina)

Where: Santa Cruz, Argentina (51.3° S, 69.0° W: paleocoordinates 52.0° S, 63.3° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Estancia La Costa Member (Santa Cruz Formation), Santacrucian (17.5 - 16.3 Ma)

• The new Eucholoeops remains utilized in this report

•derive from the intertidal Campo Barranca, Puesto Estancia La Costa, and Monte Tigre localities, all part of the Estancia La Costa Member. Although these localities are close in age, they are not contempo- raneous. Puesto Estancia La Costa is about 17.5 to 17.4 Ma (Kay et al. 2012). Monte Tigre and Campo Barranca are, respectively, stratigraphically higher (thus younger) and lower (thus older) than Puesto Estancia La Costa, but within the time span noted above. The location, extent, stratigraphy, lithology and chronology of these localities were discussed by Kay et al. (2008, 2012), VizcaĆ­no et al. (2010, 2012), Matheos & Raigemborn (2012), Perkins et al. (2012), and Fleagle et al. (2012).

• formation-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size classes: macrofossils, mesofossils

Primary reference: G. De Iuliis, F. Pujos, N. Toledo, M. S. Bargo, and S. F. Vizcaino. 2014. Eucholoeops Ameghino, 1887 (Xenarthra, Tardigrada, Megalonychidae) from the Santa Cruz Formation, Argentine Patagonia: implications for the systematics of Santacrucian sloths. Geodiversitas 36(2):209-255 [P. Mannion/M. Kouvari]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 207742: authorized by Philip Mannion, entered by Miranta Kouvari on 29.01.2020, edited by Grace Varnham

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Megatherioidea - Megalonychidae
Eucholoeops ingens1 Ameghino 1887 edentate
MPM-PV 15046 a nearly complete skull, with all teeth, and a fragmentary pelvis; MPM-PV 15086 a nearly complete skull, with its dorsal surface flattened, and the left zygomatic arch with the ascending process. It preserves the left Cf, the alveoli of the Mf1s, the left and right Mf2-Mf4, and, notably, the right ectotympanic. The mesial part of the left Cf and its alveolus are displaced slightly laterally. In addition, the specimen partially preserves other elements, such as an incomplete distal epiphysis of a femur, a fragment of a distal left fibula, and fragmentary vertebrae and ribs embedded in the matrix, which is hard, thus rendering their removal problematic.
 Rodentia - Chinchillidae
Prolagostomus sp.2 Ameghino 1887 chinchilid