By Spencer G Lucas; Kate E Zeigler; Peter E Kondrashov
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LUCAS1 AND PETER E. KONDRASHOV2 2 1 New Mexico Museum of Natural History and Science, 1801 Mountain Road, Albuquerque, NM 87104 Paleontological Institute of RAS, Profsoyuznaya 123, Moscow 117868 RUSSIA and Northwest Missouri State University, Maryville, Missouri, USA 64468 Abstract—Deltatherium dandreai is a new species from the Torrejonian Paleocene of the San Juan Basin, New Mexico. D. dandreai can be distinguished from the type and only other species of Deltatherium, D. fundaminis, by the new species’ larger size, sharper molar cusps, larger upper molar conules, larger parastyles, weaker metastyles, larger hypoconal flares and better developed lower molar entoconids.
Location map of the Baca Formation (after Lucas, 1983). Diplacodon, Leptoreodon, and Protoreodon are Uintan holdovers that are also known from the Duchesnean (but not the Chadronian), while Hyaenodon and Brachyhyops first appear in the Duchesnean and continue into the early Chadronian. Thus, the Duchesnean age of the fauna (as currently known) is well established (Lucas, 1992; Lucas and Williamson, 1993). In addition, there was some confusion because earlier authors considered the Uintan to be late Eocene, the Duchesnean late Eocene or early Oligocene, and the Chadronian early Oligocene.
From three miles above Kimbetoh Arroyo, San Juan Basin, New Mexico: AMNH 10506, left p4-m3 (isolated). From three miles east of Kimbetoh Arroyo, San Juan Basin, New Mexico: AMNH 16503, right dentary with m1-3. From Tsosie Arroyo, San Juan Basin, New Mexico: AMNH 58000, broken right M1; 58011, right p4; 58045, broken left M2; 58046, right M3; 58052, left m2; 58074, right dentary with c1, p2-m1; 58078, left P4; 58097, molar fragments; 58108, left P3, M1, right M2; 58111, left M1, right m2; 58119, right m3; 58150, left p2, m2; 58155, isolated teeth; 58156, right P4, M1; 58158, right P1, P4, M1, M2; 58161, right p4; 58179, left M3; 58191, left M2, m1; 58197, left M3 (Fig.