新疆阿尔泰地区中中新世肉食类动物

MIOCENE CARNIVORES FROM ALTAI REGION,XINJIANG

新疆阿尔泰地区中中新世“哈拉玛盖”层中产丰富的古哺乳动物。本文介绍的是其中的肉食类标本。共两种动物。

The fossils of carnivore reported in this paper were collected by an expedition of IVPP in the north side of Ulungur River in Altai Region from middle Miocene,Halamagai beds, during the field season of 1982. The fossil-bearing sites,82501,82503 and 82513(field No.)are in the same beds.The 82505 site is retransported. Systematic Description Order Carnivora Bowdich,1821 Family Canidae Gray,1821 Subfamily Amphicyninae Troussart,1885 Genus Amphicyon Lartet,1837 Amphicyon ulungurensis sp.nov. (Fig.1) Type V7731-1(82503 Lg),a broken mandible with a complete M_2,partial talonid of M_1 and the root of M_3. Referred Specimens V7731-2:a right humerus(only distal end).V7731-3:a left calcaneum.V7731-4:a left fifth tarsus. Diagnosis Mandible body massive,depth under between M_1 and M_2 is large. M_1:brachyodont;length large;trigonid length(29mm)is larger than two third of the whole tooth length(41mm). M_2:rectangle-shaped;trigonld very short;a paralophid connecting paraconid and proto- (?)onid;isolated hypoconid prominent;the outer edge of the tooth slightly convex lingally. Discussion The new species,Amphicyon ulungurensis,is larger in size than some known species found in Asia as shown in the following list: Length of M(1-3)Length of M_1 A.ulungurensis 93 41 A.youngi 63 — A.pithecophilus 72 — A.tairunmensis — 28 Its length of M_1 is close to that of A.conjuctanus(Young,1937).Unfortunately,it is very difficult to compare two species in detail because of the lose of M_2 and M_3 on A.confuctanus. Compared with European species——A.major and A.giganteus,a few traits of A.ulungu- rensis appear to be different related to the two formers:M_2 with a prominent paraconid in spite of the length of M_1 in the three species is close to each other. Family Hyaenidae Gray,1869 Subfamily Ictitheriinae Troussart,1987 Genus Ictitherium Wagner,1848 Ictitherium cf.gaudryi (Fig.2) Referred species V7732(82501),a broken mandible with M_1 and M_2.V7733(82501),a broken mandible with P_(2-4).V7734(82505),a right M_1.V7735(82513),a left P4. Discussion In the past time,Ictitherium were mainly collected from Shantxi Province,a few from Gansu and Henan in China.In recent years,new materials of this genus were found in Shaanxi Province(under study). Xinjiang specimen bears some resemblance with Ictitherium gaudryi both in morpha and size,but there are some differences between them.Xinjiang specimen:1)smaller in size;2)pro- bably no P_1;3)M_2 is the largest one among all the species of Ictitherium.