. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 2 mm. Figure 1. Left dentary of Mitredon cromptoni, MGUH VP 3392, in (A) lingual view and (B) occlusolabial view. In occlusolabial view, tfie mandibular canal is visible distally as a filled cast through a window cut in the labial aspect of the jaw; the canal obscures the basal crown of Pc„. Age. Late Triassic (PNorian—Rhaetic; Jenkins et al., 1994). Diagnosis. Cingular cusps on postcanine teeth absent or lost, a derived character shared with galesaurid cynodonts, Ci/nog- nathiis, and Frobelesodon (Hopson and Kitching
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 2 mm. Figure 1. Left dentary of Mitredon cromptoni, MGUH VP 3392, in (A) lingual view and (B) occlusolabial view. In occlusolabial view, tfie mandibular canal is visible distally as a filled cast through a window cut in the labial aspect of the jaw; the canal obscures the basal crown of Pc„. Age. Late Triassic (PNorian—Rhaetic; Jenkins et al., 1994). Diagnosis. Cingular cusps on postcanine teeth absent or lost, a derived character shared with galesaurid cynodonts, Ci/nog- nathiis, and Frobelesodon (Hopson and Kitching, 1972; Hopson and Barghusen, 1986). Differs from Therioherpetidae (Bonaparte and Barberena, 1975) and oth- er nonmanimalian cynodonts in possessing bifurcate postcanine tooth roots (hkely convergent with multirooted tritylodon- tids) and lacking alternate tooth replace- ment. Characters shared with "chiniquo- donts" are crowns of lower postcanines with laterally compressed cusps arranged in a longitudinal row and clearly separated from each other (Bonaparte and Barber- ena, 1975; Sigogneau-Russell and Hahn, 1994). A feature shared with Meui-thodon gallicus (Russell et al., 1976; Sigogneau- Russell and Hahn, 1994) and some "chi- niquodonts" (Kemp, 1982) is a recuived cusp a (following the nomenclature of Crompton and Jenkins, 1968); that is, the mesial crest is longer and more horizontal than the distal crest, which is shorter and more vertically oriented. A derived feature shared with Meurthodon, Sinoconodon, and Mammaliaformes (sensu Wible, 1991). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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