作者：齐陶

摘要： A new Eocene lophialetid genus, Simplaletes, is erected here.
    This new genus includes two species:1)  Simplaletes sujiensis; 2) Simplaletes ulanshirehensis. The former was collected from‘Irdin Manha Cliff’ (Suji-Dengenji Mesa) of Sunid Youqi and the later from Ulan Shireh of Siziwang Qi (Durbud) of Inner Mongolia.
    The discovery of Simplaletes indicates that late Eocene may be one of the periods of the major radiations of tapiroids in Asia.
    Perissodactyla Owen, 1848
        Tapidrodea Gill, 1872
             Lophialetidae Radinsky, 1965
                Simplaletes gen, nov.
    Type Species:Simplaletes sujiensi sp. nov.
    Known Distribution:Late Eocene of Asia.
    Diagnosis:Smaller—middle lophialetids;dental formula:—/ 3133; length of premolar series:that of molar series about 60%; hypoconulid very strong. Lower molar cusp patterns like those in Schlasseria.
    Simplaletes sujiensis sp. nov.
    (Plate I. Fig. l.).
    Type:V 6058, a right lower jaw with I, C and P-M (field no. ss 03010).
    Horizon and Locality: Late Eocene Irdin Manha beds, Irdin Manha Cliff.
    Diagnosis: Symphysis long; molar series relatively larger; diastema long.
    Simplaletes ulanshirehensis sp. nov.
    (Plate I. Fig. 2-3).
    Type: V 6059, lower jaws with left M and right P-M (field no. ss 01526).
    Other material:V 6060, an uncompleted lower jaws with left P-M and right P M.( field , no. ss 01623 ).
    Diagnosis:Smaller in size; symphysis very short; diastema riot long.

卷期：18卷 03期

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