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| THE ESTIMATION OF AGES FOR GREY MARMOTS (MARMOTA BAIBACINA) |
| YANG Ganyuan, ZHANG Zhijian, ZHANG Lanying |
| Institute of Endemic Disease Control, Xingjiang Uyghur Autonomous Region, China |
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Abstract Seven hundred and thirty-seven specimens of grey marmots (Marmot baibacina) were collected in the western part of Boluokeru Mountain, a branch of Tianshan, from June to August, 1983.The worn degrees on the grinding dental surfaces of grey marmots were studied. And 12 age-groups were identified among the marmots, according to the varied worn degrees. They are as follows:I . Teeth not well erupted;Ⅱ. Striped dentinal worn scars in the transverse mid-ridge of P2;Ⅲ. P2 and M3 not wormⅣ. Lunate enamel worn scars in P2 and M3 protocone;Ⅴ. "T" shaped dentinal scars in M3 protocone;Ⅵ. M3 protocone connects with middle and posterior transverse ridge, forming "⊂ " shaped dentinal scar;Ⅶ. M3 protocone connects with anterior,middle and posterior transverse ridge, forming "E" shaped dentinal scanⅧ. The enamel of protocone surfaces of various molar teeth is worn into raised thin edge, with external teeth depressed)Ⅸ. The thin enamel edges of various molar teeth and tooth rings are worn off;Ⅹ. M1 shows a "spoon" shape;Ⅺ. M1 and M2 show "spoon" shapes;Ⅻ, M3 surface shows five-petaled shapes along the gum.
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