作者：李传夔

摘要：A new genus and species of cricetodontine rodent, Sapanocricetodon ningensis is described in the present paper. The new form is represented only by an imcompleted right lower jaw with M₁-M₃ in situ (IVPP no. V4342), collected at Fang-shan, a small mesa south of Nanking. The horizon yielding the specimen is beneath the level of Anchitherium aurelianense, described by Chow and Hu in 1956. The new genus is characterized by: 1) small size (length of  M₁-M₃:3.8 mm);2) cheek teeth very brachyodont and broad (width/length of  M₁:75%);3) the structure of the  molars simple, without any stylids or mesolophids and the valleys more wide and shallow; 4) the  ectolophid short and U-shaped; 5) the anteroeonid of M1 simple, being the smallest cusp with laterally elongated crest; and 6) the mandible ramus and the cheek teeth row in one and the same vertical surface. In genernal, in size and dental structure it map be compared with some  European middle Miocene ericetids such as Democricetodon romieviens, D.minor,  Megacricetodon crusafonti, Fahlbuschia darocensis etc. However, the differences between forms of the two continents are certainly distinct. In comparison with the Late Tertiary cricetids of China or Asia, the new genus is more or less similar to a probable Late Miocene form of Hsienshuiho, Kansu, Paracricetulus schaubi Young, in small size and in broad and simple structure of molars and reduced  M₃. Unfortunately, all the Chinese Tertiary cricetids material are located abroad and not available for detailed comparison. The discovery of the new genus indicated that the Tunghsuenkuan beds which yielding the fossils of both Sapanocricetodon and Anchitherium may be of a Middle Miocene (Vindobonian) age.

卷期：15卷 01期

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