内蒙古发现脊齿獏科一新属

<正> 脊齿獏科(Lophialetidae)为 Radinsky 氏1965年所建立的一个科。目前,被归入这一科的有脊齿獏(Lophialetes)、施氏獏(Schlosseria)以及短齿獏(Breviodon)。此外,还有一红山獏属(Rhodopagus)也被暂时归入这个科内。

A NEW EOCENE LOPHIALETID GENUS OF INNER MONGOLIA

A new Eocene lophialetid genus,Simplaletes,is erected here.This new genus includes two species:1)Simplaletes sujiensis;2)Simplaletes ulan-shirehensis.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 InnerMongolia.The discovery of Simplaletes indicates that late Eocene may be one of the periods ofthe major radiations of tapiroids in Asia.Perissodactyla Owen,1848Tapiroidea Gill,1872Lophialetidae Radinsky,1965Simplaletes gen.nov.Type Species:Simplaletes sujiensis sp.nov.Known Distribution:Late Eocene of Asia.Diagnosis:Smaller—middle lophialetids;dental formula:■/(3313);length of premolarseries:that of molar series about 60%;hypoconulid very strong.Lower molar cusppatterns like those in Schlosseria.Simplaletes sujiensis sp.nov.(Plate Ⅰ.Fig.1).Type:V6058,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:V6059,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 not long.