. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. MiCROCONODON • Sues 39. Figure 1. Microconodon tenuirostris, USNM 437637, left dentary (with splenial and attached symphyseal fragment of right dentary) in lingual view. Scale bar = 2 mm. Abbreviations: an, angle of dentary; , articular process of dentary; c, canine alveolus; , coronoid process; , coronoid ridge; , articular facet for splenial; , groove for dental lamina; i1-3, alveoli for incisors 1-3; i1r, alveolus for right first incisor; , internal mandibular groove; m, mental foramen; p1-8,
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. MiCROCONODON • Sues 39. Figure 1. Microconodon tenuirostris, USNM 437637, left dentary (with splenial and attached symphyseal fragment of right dentary) in lingual view. Scale bar = 2 mm. Abbreviations: an, angle of dentary; , articular process of dentary; c, canine alveolus; , coronoid process; , coronoid ridge; , articular facet for splenial; , groove for dental lamina; i1-3, alveoli for incisors 1-3; i1r, alveolus for right first incisor; , internal mandibular groove; m, mental foramen; p1-8, postcanine 1-8 (tooth or alveolus); r, pit for replacement tooth; sp, splenial; t?, tooth fragment. without cingula. Root of some postcanine teeth constricted, with figure-eight shape in transverse section. Comment. Pahner (1903) regarded Mi- croconodon Osbom, 1886 as preoccupied by Microconodiis Traquair, 1877 and pro- posed Tytthoconus as a replacement name. Pahner's action is invalid under the rules of the International Code of Zoological Nomenclature, and Tytthoconus Palmer, 1903 is an objective junior synonym of Mi- croconodon Osbom, 1886. Microconodon tenuirostris Osbom, 1886 Dromatherium sijlvestre Emmons, 1857: 93 (in part) Microconodon tenuirostris Osbom, 1886a: 540 Holotype. ANSP 10248, right dentary with four preserved postcanine teeth, lack- ing the articular process and part of the coronoid process (Simpson, 1926b). The specimen is preserved on a slab of coal, and preservation of most structural details is indistinct. Type Horizon and Locality. Basal coals of the Cumnock Formation, Sanford sub- basin of the Deep River basin, Newark Su- pergroup; coal mine (now abandoned) at Egypt, Chatham County, North Carolina. Age: Late Triassic (late Camian; Litwin and Ash, 1993). Newly Referred Material. USNM 437637, incomplete left dentary lacking much of the articular and coronoid pro- cesses, with alveoli for three incisors and the canine, seven mostly broken postca- nine
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