Didelphodon coyi Fox and Naylor, 1986

Fox, Richard C. & Naylor, Bruce G., 2006, Stagodontid marsupials from the Late Cretaceous of Canada and their systematic and functional implications, Acta Palaeontologica Polonica 51 (1), pp. 13-36 : 20

Didelphodon coyi Fox and Naylor, 1986

Figs. 1C , 2 , 3A, B .

Holotype: TMP 84.64 .1, incomplete right dentary containing p3, m3–4 ( Fox and Naylor 1986: figs. 3, 4). Edmontonian Land Mammal Age (early Maastrichtian), Michichi Creek , Alberta.

New material.—TMP 91.166.1, an incomplete right dentary containing p1–3, m1–2, m4 (broken), and roots of the canine, two incisors, and m3 contained in their alveoli, from Paintearth Creek, Alberta; TMP 90.12.29, an incomplete left dentary with heavily worn and broken p3, alveoli for m1–4, the canine, p1? and p2, from the type locality, Michichi Creek, Alberta ( Fox and Naylor 1986) (both of these localities are in the Horseshoe Canyon Formation, with exact coordinates on file at the Royal Tyrrell Museum of Palaeontology); TMP 94.125.125, incomplete right maxilla with P3, M1 and damaged M2, from the latest Cretaceous (latest Maastrichtian; Lancian) Scollard Formation at KUA−1 [see Lillegraven (1969) for description of the locality and Archibald (1982) for account of the Trochu local fauna; see Fox (1974) and Fox and Naylor (2003) for important additions to this local fauna].

Although the dentary TMP 90.12 .29 was found at the type locality and is from the opposite side of the jaw than the holotype , the two specimens are clearly from different individuals as evidenced, for example, by the deep wear exhibited on p3 of TMP 90.12 .29 and the virtually unworn p3 of the holotype .

Figures

Fig. 1. A. Eodelphis browni Matthew, 1916, incomplete left maxilla, TMP 85.53.3, from the Dinosaur Park Formation, Judithian Land Mammal Age (late Campanian), Dinosaur Provincial Park, Alberta, containing P1–2, M1 in occlusal (A1) and labial (A2) views. B. Eodelphis cutleri (Smith Woodward, 1916), incomplete right maxilla, UALVP 7031, from the Dinosaur Park Formation, Judithian Land Mammal Age (late Campanian), mouth of Sand Creek, Dinosaur Provincial Park, Alberta, containing M1 (broken), M2–3 in occlusal view; arrow shows posterior alveolus of P3. C. Didelphodon coyi Fox and Naylor, 1986, incomplete right dentary, TMP 91.161.1, from the Horseshoe Canyon Formation, Edmontonian Land Mammal Age (early Maastrichtian), Paintearth Creek, Alberta, containing i2–3 (broken), c (broken), p1–3, m1–2, m3–4 (broken) in labial (C1), lingual (C2), and lingually oblique (C3) views. A1 and B stereophoto pairs. Scale bar 5 mm.

Fig. 2. Didelphodon coyi Fox and Naylor, 1986 from the Horseshoe Canyon Formation, Edmontonian Land Mammal Age (early Maastrichtian). A. TMP 91.161.1, Paintearth Creek, Alberta, incomplete right dentary, containing 12−3 (broken), c (broken), p1–3, m1–2, m3–4 (broken) in occlusal (A1) and anterior (A2) views. B. TMP 90.12.29, Michichi Creek (type locality), Alberta, incomplete left dentary, containing p3 (broken) in occlusal (B1) and labial (B2) views. A1 and B1 stereophoto pairs. Scale bars 5 mm.

Fig. 3. A. Didelphodon coyi Fox and Naylor, 1986, condyle and inflected angle of TMP 90.12.29, from the Horseshoe Canyon Formation, Edmontonian Land Mammal Age (early Maastrichtian), Michichi Creek (type locality), Alberta, in posterior view with ventral surface of inflected angle horizontal (A1) and dorsal surface of condyle horizontal (A2). B. Didelphodon coyi Fox and Naylor, 1986, incomplete right maxilla, TMP 94.125.125, from the Scollard Formation, Lancian Land Mammal Age (late Maastrichtian), KUA−1 locality, Red Deer River Valley, Alberta, containing P3, M1, M2 (broken) in occlusal view. C. Eodelphis cutleri (Smith Woodward, 1916), incomplete right maxilla, UALVP 43005, from the Dinosaur Park Formation, Judithian Land Mammal Age (late Campanian), Onetree Creek, Dinosaur Provincial Park, Alberta, containing M2–3 in occlusal view. D. Undescribed Alphadon−like marsupial, incomplete left maxilla, TMP 95.178.26, from the Oldman Formation, Judithian Land Mammal Age (late Campanian), Devil’s Coulee, Alberta, containing P1–3, M1–4 in occlusal (D1) and labial (D2) views. B, C, and D1 stereophoto pairs. Scale bars 5 mm.