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. 1

LIEB-PV 1153, a maxillary fragment with M1–2, as well as four lower molars are included in this new species recovered in La Barda and Laguna Fría. It differs from Polydolops serra , the morphologically closest taxon, in its smaller size; double StC in M1; accessory labial cusps that form a crenulate crest; metacone and StD almost fused in M2; the large lingual cusp of m1 the talonid is the second posterior to the trigonid (instead of the first, as in P. serra ). Also, m1 is proportionally larger and narrower than in P. clavulus , having three labial cusps instead of four, as in P. clavulus . Compared with Polydolops sp. nov. 3 (see below), this taxon is smaller; M1 has three cusps in the posterior lobe; there is no ectoflexus; the metacone is well distinct in M2; and m1 has the second lingual cusp undivided and comparatively much larger.