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原始哺乳动物
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  primitive mammals
     Since 1990s, with the discoveries of abundant rare fossils such as Confuciusornis sanctus, Sinosauropteryx prima, Eomaia scansoria and Archaefructus liaoningensis, western Liaoning has become the most famous area for the study of Mesozoic strata, the origin and evolution of primitive birds, primitive mammals and early angiosperms in China and even all over the world.
     20 世纪90 年代以来,随着热河生物群中以孔子鸟、中华龙鸟、始祖兽、辽宁古果为代表的大量珍稀化石的发现,辽西地区已成为全国乃至世界研究中生代陆相地层、原始鸟类、原始哺乳动物和早期被子植物起源与演化的独一无二的地区,其产出化石的丰富性、多样性等完全可与德国巴伐利亚州索伦霍芬地区以始祖鸟为代表的生物群相媲美。
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  相似匹配句对
     Regulation of Initiation of Primordial Follicle Growth in Mammals
     哺乳动物原始卵泡生长启动的调控
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     Mammalian Polar Bodies
     哺乳动物的极体
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     f mutated by nitrous acid, the bio-activity of the bacterium T.
     f菌和原始T .
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     Talk about Primitive Porcelain
     继往开来——原始
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     A BRIEF SURVEY OF MAMMAL TERATOLOGY
     哺乳动物畸形学简介
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  primitive mammals
It is concluded that true prismatic enamel also existed in non-therian primitive mammals.
      


Bienoineroiaes wannsienensis is a representatlve or late trltyiodlonts, occurred together with the sauropod Maonenchisaurus in the upper Sha-Xi-Miao Formation of Sichuan. The age of the Formation is new generally oonsidered as middle Jurassic (based on invertebrate, fish fossils), or even early Late Jarassic (on dinosaurs). The material dealt here with are a number of postcranial bones belonging to three individuals. Most of the speeimens described are of V7905 and V7906, and a small portion (V4734) being selected...

Bienoineroiaes wannsienensis is a representatlve or late trltyiodlonts, occurred together with the sauropod Maonenchisaurus in the upper Sha-Xi-Miao Formation of Sichuan. The age of the Formation is new generally oonsidered as middle Jurassic (based on invertebrate, fish fossils), or even early Late Jarassic (on dinosaurs). The material dealt here with are a number of postcranial bones belonging to three individuals. Most of the speeimens described are of V7905 and V7906, and a small portion (V4734) being selected as the type of Bienotheroides wanhsienenssis. The morphology of vertebrae is similar to that of Oligokyphus and Morganucodon. A set of shoulder girdle with interclavicle and presternum is completely preserved in V7905. The interclavicle is T-shaped, essentially similar to those of Morganucodon and Echidna. Presternttm is a Pair of thin and elongate plate. No sternum is preserved. What interested us is a small piece of protuberance arised at the anterior dotal border on the medial surface of the scap ular blade. A fossa is thus formed between the protuberance and the anterior margin of scapular. It is situated exactly at the place where the mammalian supraspinatus fossa exists. The small notch at the same position in cf. Cynognathus ( Diademodon) (Jenkins, 1971, f. 17, B) could be well compared with this struture. Therefore, it is presumed that the incipent supraspinatus fossa was already present in some of the advanced cynodonts. Jenkins thought that the relative large size of cynodont procoracoid and its close apposition to the cllavicle bloeked supracoracoideus from passing beneath the clavicle to the medial seapular surface. According to the reconstruction of the shoulder girdle of Bienotteroides, the acromion process has moved greatly forward. The procoracoid, though retained its large size, turned postero-medially together with the adjacent area of scapular. As a result, M. supracoracoideus could migrate through the space between the clavicle and procoracoid onto the medial surface of the scapular and attach to the fossa. Consequently, the presence of supraspinatns muscle could be expected. We explained the sort of the structure of scapular as evolyed from the primitive type in most of the cynodonts, in which, no sign of the fossa is shown, the procoracoid stretched extensively beneath the clavicle. A probably later stage is seen in Campotomus (McKenna, 1961), there the procaracoid is lost, eoracoid reduced and moved antero-ventrally and medially, with both supra and infraspinatns M. well developed. This is identical with the embryological achivements in the study of Didelphis (Cheng, 1955). A description of other limb bones is also given in this paper. Considering the appeasance of supraspinatus fossa in Bienotheroides, the authors believe that there is a closer relation between tritylodonts and mammals.

本文记述了最晚期的三列齿类——似卞氏兽 (Bienotheroides) 的头后骨骼,并和其他三列齿类以及原始哺乳动物作了对比.肩胛骨上雏型岗上窝的出现,证明三列齿类与原始哺乳类的关系要比以往想象的更为密切.

 
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