Polydolops, Tejedor & Goin & Gelfo & López & Bond & Carlini & Scillato-Yané & Woodburne & Chornogubsky & Aragón & Reguero & Czaplewski & Vincon & Martin & Ciancio, 2009

Tejedor, Marcelo F., Goin, Francisco J., Gelfo, Javier N., López, Guillermo, Bond, Mariano, Carlini, Alfredo A., Scillato-Yané, Gustavo J., Woodburne, Michael O., Chornogubsky, Laura, Aragón, Eugenio, Reguero, Marcelo A., Czaplewski, Nicholas J., Vincon, Sergio, Martin, Gabriel M. & Ciancio, Martín R., 2009, New Early Eocene Mammalian Fauna from Western Patagonia, Argentina, American Museum Novitates 3638, pp. 1-43 : 17

Polydolops , sp. nov. 2

LIEB-PV 1173, a right maxillary fragment with M1–2, as well as several maxillary and mandibular remains and isolated teeth have been assigned to this new taxon collected in both localities of Paso del Sapo. In general, it is morphologically closer to the above-described Polydolops sp. nov. 1 than to any other known polydolopine, except for its larger size and several other traits including: M1 with two lingual cusps instead of three in the posterior lobe; m1 with the second labial cusp divided and comparatively much smaller; labial accessory cusp larger than in sp nov. 2; and hypoconid of m2 more posteriorly placed and with the second lingual cusp proportionally smaller. The morphology of M1—with three cusp rows from which the two labial ones are merged—is clearly distinguishable from all other known polydolopines.