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high crown
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     A REVIEW OF THE DEVELOPMENT AND OPERATION OF HIGH CROWN (HC) MILLS
     HC轧机的研究及应用概况
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     Brief Introduction on Cold Tandem High Crown Control Mill in Panzhihua Iron and Steel Company
     攀钢HC冷连轧机简介
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     For the rolls of the 1200 HC(high crown) 6-high reversing cold mills,the measures of precaution and elimination of roll failures were put forward from some aspects such as roll inspection,roll grinding and assembly etc.
     以1200HC6辊可逆冷轧机轧辊为研究对象,从轧辊检测、磨削和装配等多方面提出了轧辊缺陷的预防和消除措施。
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     Using the panchromatic wave band of high spatial resolution remote sensing image-QuickBird as the data source, the crown of plantation White Bark Pine (Pinus bungeana) with relative high crown closure was accurately estimated by applying the semivariogram theory of spatial statistics.
     以高空间分辨率遥感影像QuickBird的全色波段为数据源,应用空间统计学半方差理论,对郁闭度较高的人工白皮松林冠幅尺寸进行较为准确地估计。
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     It is concluded that the semivariogram method of spatial statistics may be as an effective means of estimating the crown of pure forest stand with relative high crown closure.
     结果表明:空间统计学半方差方法可以作为郁闭度较高纯林林分冠幅估计的一种有效方法。
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     Grind Research of Spherical Crown with High Precision
     高精度球冠的磨削研究
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     High Precision Plate Crown Model for On-Line Application
     在线高精度中厚板凸度计算模型
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     high-technology;
     产业高技术化;
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     High accuracy;
     Ⅱ、精度高;
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     Archimedes & Crown
     阿基米德与王冠
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  high crown
Five cycles of mass selection for high and low crown height in one tetraploid sugar beet population and four cycles of mass selection for high crown height in another tetraploid population gave average gains of 10-15% per cycle.
      


A lot of mammalian f ossils were discovered in the green lacustrine deposits between the Upper Pliocene Lantian Series and the Lower Pleistocene Sanmenian Series at the lower course of river You in the district of Weinan. Shensi It is very important in determining the age of the deposits in which the fossils were found. On account of the widespread distribution of similar deposits in North China, and its age couldn't be determined exactely by lacking the reliable fossils especially the mammlian fossils, so this...

A lot of mammalian f ossils were discovered in the green lacustrine deposits between the Upper Pliocene Lantian Series and the Lower Pleistocene Sanmenian Series at the lower course of river You in the district of Weinan. Shensi It is very important in determining the age of the deposits in which the fossils were found. On account of the widespread distribution of similar deposits in North China, and its age couldn't be determined exactely by lacking the reliable fossils especially the mammlian fossils, so this finding of river You would aiso be meaningful in dividing and correlating of those similar deposits.The fossils are listed in the front of this paper, and the characters of the main or new specises are:Elaphas youheensis (sp. nov.)The crown of molar is broad, but very low i n height, plates moderatly thick and widely spaced, The lamellar frequency is very low (3.25). The enanmal layers are very thick (4.2-5.6 mm.) only lightly folded in the middle part. The well worn anterior plates show medial sinus and each of the posterior two ridges consists of 4 digitations with prominent median cleft. Cement is moderately developed.The elephant specimen of river You is very similar to the Archidiskodon cf. planifrons, A. planifrons, of Bethlehem and India respectively, They all show the rather primitive features, It seems that they could be separated from the more progressive A. planifrons of later possesed of higher crown, thinner enamal layer and higher lamellal frequency. And thus they could represent the early stage of Elephantinae.Sus subtriquetra (sp. nov.)Small-middle size. Canine more slender and longer, the size and shape of its crown top is nearly as well as the basal part, and the eross section shows a round triangle.Nyctereutes sinensisIts crain and teeth are larger than the specimens collected at Nihowan, Kongwanglin., Choukoutien, and also larger than the N. megamastoides of Europe.Mimomys youhenicus (sp. nov.)All the inselfalte, prismenfalte: and mimomyskante well developed. Enamal islet exists at about the same stage as the tooth bas two large roots, the roots grew early. The fourth inner trianglar nearly opposite to the third outer trianglar, and the posterior side of the crown is rather flat and long.It can be seen, from the above, that (1) among these fossils such as Hipparion houfenense, Cervavitus are so far known mainly in the Pliocene depoaits, there are, however, other genera as Elephas (i.e. Archidiskodon), Mimomys and Ochotonoides etc. found mainly in Pleistocene especially in Lower Pleistocene deposits, and the extinct genera and species have a rather high percentage. (2) According to the structures and characteristics, the new specieses in this fauna are evidently more primitive than those of the same genera of the Early Pleistocene, such as E. planifrons, M. orientalis and Sus lydderkery, and on the other hand, they are more advanced than the Pliocene's. (3) Equidae and Bovidae, as the noted guide fossils of Pleistocene, are absent and replaced by Hipparion.From the above analysis, the fauna of river You is neither similar to the Hipparion fauna of Pliocene, nor to the Proboscidipparion-Equus fauna of Early Pleistocene. It seems to be transitional and reprents a new fauna. On this account, we call it the "You-he Fauna". The age of it, evidently, may correlated to the Early Villafranchian of Europe and between the Late Pliocene and Nihowan Period of middle Early Pleistocene of China.The green lacustrene deposits of river You yielding the You-he fauna may be called the "You-he Series", which may be found in other part of Shensi (contains Anconcus), Shansi (contains the same lower crown Elephas (i.e. A. planifrons, see Teilh. et Trass. 1937) and further north to Nihowan of Hopei. The You-he Series may be correlated with the "Lower Nihowan" beds containmg the fishes of Pungitius.

在陕西渭南游河下游产有泥河湾动物群的三门组之下和上新世蓝田组之上的灰绿色堆积中,发现了许多哺乳类化石。其中的一些主要类别明显地具有其上新世种和更新世种之间的过渡特点。使整个动物群表现出与上下动物群都不相同的特有性质,因而把它称为“游河动物群”;其所在的一套地层称为“游河组”。时代为早更新世早期。

Mimomys, as an important guide fossil was mainly found in the Late Cenozoic deposits of Europe. More than 40 local species of the genus have been docmnented in Europe since Forth-Major, created the genus in 1902. Two corresponding genera, Cosomys and Ogmodontomys, have also been identified in North Ameriea. In China, Kormos recognized the first Mimomys, named as Mimomys chinensis sp. nov., in 1934 when he revised the material described originally by Teilhard de Chardin and J. Pivetean (1930) as Arvicolide indet....

Mimomys, as an important guide fossil was mainly found in the Late Cenozoic deposits of Europe. More than 40 local species of the genus have been docmnented in Europe since Forth-Major, created the genus in 1902. Two corresponding genera, Cosomys and Ogmodontomys, have also been identified in North Ameriea. In China, Kormos recognized the first Mimomys, named as Mimomys chinensis sp. nov., in 1934 when he revised the material described originally by Teilhard de Chardin and J. Pivetean (1930) as Arvicolide indet. from Nihewan basin, Hebei. Since then, several species of the genus, M. orientalis Young, 1935, M. banchiaonicus Zheng et al, 1975, M. gansunicus Zheng, 1976, M. heshuinicus Zheng, 1976 and M. youhenicus, Xue, 1981 have been found one af- ter other in the different horizons of the Late Cenozoic deposits of North China. Unfortunately, all the materials collected are so fragmentary and most of the original description of these taxa are so sketchy and scattered in a number of different Chinese publications that the utilization for comparison in detail and for the stratigraphical correlation with other continents, has undoubtly been obstructed. The purpose of the present paper is trying to give a general review of the Chinese Mimys: on reexamination, systematic phylogeny, stratigraphical successions. Some new materials, including a new species——Mimomys peii, collected frown 5 new localities are describad in this paper. Description Mimomys (Villanyia) chinensis Kormos, 1934 Type A right lower jaw with M_(1-3) of young individual (IP 156, Teilhard et Piveteau, 1930, p.123, text-fig. 40; Kormos, 1934, p. 6, text-fig, 1c) (IVPP cat. no. RV 30011). Type locality Xia Sha-gou village, Yangyuan, Hebei. Referred materials A right lower jaw with I and M_(1-3)(V 8109) from Xi Yingzi, Lin Xi, Liaoning; a fragmentary left lower jaw with M_(1-2) (V 4766) and a left M_1 (V 4766. 1) from Jing-gou, Heshui, Gansu (Zheng, 1976, p. 115); a right M~1 (V 6043. 1) and a left M_3 (V 6043. 2) from locs. 77076 and 77078 of Gonghe basin, Qinghai (Zheng et al., 1985, p. 111). Diagnosis Size small. Without cement in the reentrant folds of molars. Prismfold, Mimomys-ridge and enamel-islet lacking. Anterior loop long and anterior cap situated labialy on M_1. Remarks Teilhard de Chardin et J. Piveteau (1930, p. 124) pointed out that the M_1 of Sangkan-ho is identical with that of Mimomys intermedius in having similar design and same degree of hypsodonty, but "rien ne nous autorise encore rattacher l'espce chinoise un genre europen caractris normalement par une brachydonite accentue et la prsence d'un bizarre lot d'mail entre le premir triangle externe et la boucle de la premire dent infrieure." Kormos (1934, p. 5) considered that "L'Arvicolid de Chine tait justement en train de dvelopper ses racines et tant donn cette circonstance, et en considration du dessin des dents, on doit, en premier lieu, le computer au Mimomys." After comparing it with M. neutoni, he cache to the conclusion that "il n'y a ancun doute que l'Arvicolid du Sangkan-ho soit un reprsentant du genre Mimomys, connu jusqu'ici seulement en Europe. Quoique ce type soit trs proche du Mimomys newtoni..." Although Teilh ard and Leroy (1942, pp. 32, 92) still referred it to Arvicola terraerubrae, yet Schaub (1943, p. 286, foot-note 19)regarded it as M. newtoni. Hellet ()957, p. 223) emphasized that Mimomys chinensis "...eine Form vorliegt, die nicht nur aussere Ahnlichkeit mit M. newtoni F. Major hat, sondern offenbar zu dieser sogar recbt nahe Verwandtschaft unterhlt." Both "Mimomys heshuinicus Zheng, 1976" from Jing-gou, Heshui and "Mimomys (Villanyia) laguriformes Erbajeva, 1973" from Transbeigal region, USSR seem to be synonymous with M. (V.) chinensis. Mimomys chincnsis also comforms to the definition of the subgenus Villanyia (Kretzoi, 1956) in lacking cement in the reentrant folds of molars and having an elongated and simplified anteroconid complex on M_1, so, we would like to bake the Chinese species as Mimomys (Villanyia) chinensis. Mimomys orientalis Young, 1935 Type A right M_1 of young individual (be lost) (Young, 1935, p. 33, text-fig. 12). Type locality Dongyan, Pinglu, Shanxi. Referred materials Fragment of a right lower jaw with M_(1-2) (IVPP cat. no. RV 42009) (Teilhard de Chardin, 1942, p. 96, text-fig. 59) from Haiyan, Yushe, Shanxi; fragment of a right lower jaw with M_(1-2) (V 8110) from Jizi-gou, Yushe; a right M, (75 Wei ①1.4, Xue, 1981, p. 37, Pl. II, fig. 6c). Diagnosis A more primitive species of Mimomys, characterized by 1) complete lack or poverty in cement of the molars; 2) the islet-fold, prism-fold and Mimomys-ridge in M_1 persistiug laterally to a lower place and the enamel-islet disappearing late, and 3) Paraneters E, Ea and Eb are 2.33, 2.25 and 1.00-1.25 respectively. Remarks Young (1935, p. 34) wrote that "the closest European form, in shape and in size, seems to be M. savini. From M. savini, M. orientalis difers only by the less opposite position of the third triangle with the third outer folds and the more complicated appearance of the prism-fold of the antcrior lobe." However, Kowalski (1960b, p. 479) pointed out "...this species represents an evolutionary stage similar to that of M. gracilis (Kretzoi) and M. stehlini Kormos." It is quite obvious that some primitive characteristics, for example, relative brachyodont molars, earlier formed roots, later disappeared enamel-islet, more confluent triangles, less or no cement, narrower reentrant folds, shortened and broad anterior loop and lower enamel-free area etc. are not close M. savini, but similar to one of the primitive European species. M. orientalis in size (M_1=2.8-3.12 mm in length) is larger than M. gracilis (2.5-2.6, Csarnota-2 type loc.), smaller than M. polonicus (3.1-3.4) and closer to both M. occitanus (2.70-3.33) and M. stehlini (2.8-3.36). The Parameter E(=2.33) of M. orientalis is inferior than that of M. polonicus (about 2.76-4.07), superior than that of M. occitanus (about 0.7-1.84) and falls within the variation range of that of M. stehlini (about 1.82-4.05). The disappearance of the enamel islet on the M_1 of M. oricntalis is earlier (about at the half of the height of crown) than all the species mentioned above. The noticeable confluence and symmetry of the outer and inner triangles might indicate that both M. orientalis and M. stehlini are in the same evolutionary stage. It is not even impossible that these two species may be synonymous. If so, the immigration of Mimomys between Europe and Asia during the Late Pliocene should be considered. Mimomys youhenicus Xue, 1981 Lectotype A right M_1 of young individual (75 Wei① 1.1, Xue, 1981, p. 37, Pl. II, fig. 6b). Type locality Youhe, Weinan, Shaanxi. Referred material A right M_1 (75 Wei ①1.2, Xue, 1981, p. 37, Pl. II, fig. 6a). Diagnosis A Mimomys slightly more advanced and smaller than M. orientalis, with more developed cement in the reentrant folds and higher enamel-free area on the labiai side of M_1 (Parameter E=3.67, Ea=3.33, Eb=2.17-2.58). Remarks Originally, Xue (1981) referred 4 specimens to her new species, M. youhenicus. During the reexamination, we found that these four isolated teeth might represented three different forms: M. orientalis (75 Wei ① 1.4, vide supra.), Mimomys sp. 2 (75 Wei ① 1.3, vide infra.) and M. youhenicus. The lectctype and another M_1 of M. youhenicus differ from M. orientalis in smaller size, higher crown, slightly smaller enamel-islet, simpler anterior cap and thicker cement. The specimen, an anterior part of M_1 (75 Wei ① 1.3), referred to Mimomys sp. 2 is larger in size and with more primitive characters. Although the Parameter E(=3.67) of M. youhenicus falls still in the variation range of M. stehlini (about 1.82-4.05), it can not be regarded as to be identical with the latter because of its obvious hypsodonty and more abundant cement in the reentrant folds. It is likely that M. youhenicus is at a slightly more advanced evolution stage than booth of M. orientalis and M. stehlini, but primitive than that of M. pliocaenicus and M. polonicus. Perhaps it is nearly at the same stage with M. kretzoii of Hajnk. Mimomys gansunicus Zheng, 1976 Holotype A right M_1 of adult individual (V 4765). Type locality Jing-gou, Heshui, Gansu. Referred materials Fragment of a right upper maxilla with M~(1-2) (V4765. 1) two left M~2 (V 4765.2-3), collected from the same locality as Holotype. Diagnosis Medium sized. In M_1, dentine space between outer and inner salient angles closed, prism-fold wider and extending down to the base of the tooth, islet-fold narrower and ending laterally at a higher level of crown, enamel-islet lacking or disappearing earlier, enamel-free area labially rather higher. Two roots present on M~(1-2). Thick cement in the folds of molars. Remarks The elosed dentine spaces of M_1 between outer and inner salient angles, the absence of the eannel-islet, the thick cement and the rather higher enamel-free area obviously indicate that M. gansunicus is more advanced than M. orientalis, M. youhenicus and M. banchiaonicus of China. Although M. gansunicus is closer in size (M_1=2.92 mm in length) to M. cf. intermedius (M_1=3.14mm) from Lishi of Shanxi (vide infra) or the M. intermedius of Europe, it differs from the latters in having more downward extending islet-fold, Mimomys-ridge and prism-fold, while in European species, "die komplikationen des M_1 (Prismenfalte, Inselfalte, Mimomys-kante, Schmelzinsel) nur zuoberst an der Krone nachzuweisen sind und noch vor Beginn der eigentlichen Wurzelbildung der Abfragung verfatlen. "Konmos, 1931, p. 10) M. gansunicus seems to be closer to "Cromeromys irtyshensis Zazhigin, 1980" (M_1=2.95 mm) both in size and structure, but its narrower prism-fold, robuster Mimomys-ridge and more downwards extending islet fold perhaps suggest that the Siberian form may represent a slightly primitive animal. Mimomys banchiaonicus Zheng et al., 1975 Holotype A left M_1 of an old indivicdual (V 4755). Type locality Lang-gou, Heshui, Gansu. Diagnosis Very large in size; much thick cement on the molars; enamel-islet probably disappearing earlier; prism-fold, Mimomys-ridge and islet-fold persisting down to the base of crown; enamel-free area rather low (Parameter E=0.47); the thickness of enamel on the occlusal surface less differential. Remarks Comparison with the large-sized group of European Mimomys, the M. banchiaonicus is still larger in size. (M_1=4.00 mm) than M. pliocaenicus (M_1=3.41-3.92 mm, after Chaline, 1974), yet close to both M. ostramosensis (M_1=3.10-4.15) and M. rex (M_1=3.8-4.2). Morphologically, it differs from M. pliocaenicus in more downwards extending prism-fold and islet-fold, and the low enamel-free area (Parameter E of M_1 in M. pliocaenicus is about 4.32-5.27, after Chaline, 1974, p. 340, text-fig. 2). M. banchiaonicus differs from M. ostramosensis of Hungary by 1) enamel-islet and Mimamysridge persisting until very late stage of wear, and 2) the enamel-free area obviously much lower than in latter species. According to the characteristics of M. rex given by Kormos (1934): size very large, absence of prism-fold and Mimomys-ridge, islet-fold deeper, with or without enamel-islet, abundant cement and dentine space between outer and inner salient angles closed etc., it should be cosidered that M. rex is more advanced than M. banchiaonicus. Probably M. banchiaonicus represents an ancestor form of the largesized group of Mimomys with thick cement in folds of molars. Mimomys cf. intermedius (Newton, 1881) A fragment of right lower jaw with M_(1-3) (V 8111) from Chaojia-yan, Lishi, Shanxi may be referred to this species, The lower incisor crosses the jaw from lingual to labial side between M_2 and M_3, the muscular impressions sharply defined and the masseter medialis muscle is divided into two parts as in M. intermedius figured by Hinton (1926, p. 369, Pl. XIV, fig. 2). Judging from 1) the length of the lower tooth row (7.17 mm), 2) the disappearing of prism-fold and Mimomys-ridge at a very early stage of wear, and 3) the absence of enamel-islet on M_1, the Chao-jia-yan specimen is identical with that of M. intermedius or M. savini of Europe. The only difference might be that the lingual fold of the anterior loop on M_1 of Shanxi specimen is deeper. Mimomys sp. 1 Materials A right lower jaw with M_(1-3) of a very old individual; a right lower jaw with M_2 and an isolated right M_3 (V 6338). Locality Xicun, Tunliu, Shanxi. Remarks This sample was described originally by Zong et al. in 1982 under the name of M. cf. banchiaonicus. However, its smaller size (M_1=3.68 mm), absence of cement and the persisting of the enamel-islet of M_1 to base of crown are definitely different from M. banchiaonicus and may represent the most primitive species of Mimomys known in China to present. Mimomys sp. 2 Anterior part of a right M_1 (75 Wei ① 1.3) from Youhe, Weinan, Shaanxi described as M. youhenicus by Xue in 1981 is different from either M. youhenicus or M. ori- entalis in its larger size, more downward extending of the islet-fold, thicker and stronger salient angles and more abundant cement of molar, but more similar to that of M. banchiaonicus. Mimomys peii sp. nov. Holotype A right M_1 of an adult individual (V8112). Paratype An anterior part of right M_1 of a juvenile (V 8113). Referred materials 7 left and 5 right M_1 (V 8114. 1-12); 3 left and 3 right M_2 (V 8114. 13-18) ; 2 left and 1 right M_3 (V8114. 19-21); 8 left and 12 right M~1 (V 8114. 22-41); 5 left and 5 right M~2 (V 8114. 42-51); and 2 left and 2 right M~3 (V 8114. 52-55). Derivation nominis Named in honor of late Prof. Pei, W. C, a well-known paleontologist and paleoanthropologist in China. Type locality Dachai, Xiangfeng, Shanxi. Diagnosis Later sized, hypsodont, enamel-islet present only at early stage of wear on M_1, but at very worn stage on M~3; islet-fold, Mimomys-ridge and prism-fold persisting to the base of crown on M~1; dentine spaces of molars partly confluent; thicker cement in reentrant of molars. Remarks M_1 of M. peii (3.20-3.95 mm in length) differs from that of M. banchiaonicus (M_1=4.00mm) in smaller size, higher enamel-free area, less developed cement and lack of enamel band at post-external base of crown. The new species is comparable with European M. pliocaenicus in size, but differs also by higher enamel-free area, earlier disappearance of the enamel-islet, late eruption of molar roots and possessing only 2 roots on M~2 etc. The differences may indicate that M. peii is phylogenetically more advanced than M. pliocaenicus. M. peii is close to M. rex in size, but its later disappearance of prism-fold, isletfold and Mimomys-ridge; labially uncurved anterior cap and more confluent dentine spaces between outer and inner salient angles may indicate that it is more primitive than M, rex. M. peii is close also to M. ostramosensis (M_1=3.10-4.15) in size and in the number of roots of upper molars. From M. ostramosensis, however, the new species differs by the more persistent islet-fold and Mimomys-ridge of M_1, the later disappearance of cnamel islet on M~3 and the more confluent dentine spaces of molars. M. peii is similar to M. reidi in number of roots of upper molars, but distinguishable from the latter in larger size, later disappearance of islet-fold and Mimomys-ridge. As a whole, it may be suggested that M. peii is phylogenetically more advanced than M. pliocaenicus and somewhat primitive than M. ostramosensis, M. reidi and M. rex. Conclusion I. Based on the above descriptions, we set up the Chinese Mimomys zones and their correlation with the European zones tentatively as in the table 5 (see Chinese text). II. Evolutionary trend of Chinese Mimomys 1. The roots of upper molar reduced in number M. orientalis has 3 roots in all of upper cheek teeth; in M. peii sp. nov., the last two upper molars possess 2 roots; while all the upper cheek teeth of M. gansunicus have only 2 roots. Such an evolution trend has been observed in European forms, e.g.M, stehlini, M. ostramosensis and M. newtoni. 2. The deposits of cement There are two different lines concerning the olcarrenee of cement in the reentrant folds cf molars: a) represented by M. orientalis——M. youhenicus M. gansunicus, cement deposits gradually thickened as shown in the European forms of the correlated ages; b) M. banchiaonicus may be near the ancestor of the species filled with thick cement. 3. Height of crown The parameter E of M. orientalis (=2.33) and M. youhenicus (3.67) fall into the range of change of M. stehlini——M. polonicus (about 1.82-4.07), while the M. banchiaonicus (0.47) is roughly the same as the stage of M. occitanus (0.32-1.79). 4. Variation of the anteroconid complex of M_1 a. Anterior cap: The presence of a shorter and broader anterior cap with deeper lingual fold in M. banchiaonicus, M. orientalis, M. youhenicus and M. peii might represent a primitive nature or property. b. Enamel-islet and islet-fold: Morphologically, the evolution trend can be shown as (1) islet-fold beeoming shallow, even lost; (2) enamel-islet disappeared ontologically gradually early; and (3) the shape of enamel-islet changing from oval to circle and the direction of its long axis from anterointernal-postexternal to transverse. The persistance of the islet-fold on the lateral side is almost equal to that of the prism-fold in M. banchiaonicus and M. occitanus; somewhat shorter than the latter in M. orientalis and M. stchlini, and shorter obviously in M. youhenicus, M. kretzoii and M. polonicus. c. The phylogenetic evolution line is characterized by the reduction of both Mimomys-ridge and third labial salient angle projecting outward and by the regression of prism-fold extending to the base of the shaft of M_1. In this case, the M. banchiaonicus, M. orientalis, M. youhenicus and M. peii should be considered as prhnitive forms. III. Chronological sequence of various species of Mimomys in China The following paragraph will discuss shortly on the faunal assemblages associated with the various species of Mimomys found in China. The chronological sequence among the related faunas reflected in accordance with the morphological evolution trend of Chinese Mimomys. M. (V.) chinensis has been found in the fluvio-lacustrine deposits of Nihewan and Gonghe and also in the upper part of Wucheug loess (eqtal to the Zone B of reddish clay of Teilhard and Young, 1931) from several localities in North China (vide supra.) Associated with M. (V.) chinensis are the following taxa: Myospalax arvicolinus, M. tingi, Ochotonoides complicidens, Hypolagus brachypus, Proboscidipoarion sinensis, Equus sanmeniensis, Cervus boulei, Gazella sinensis, Cynailurus pleistocaenicus, Machairodus nihowanensis, Pliohyaena licenti etc.. Such an assemblage, representing Nihewan (s.s) stage, might correspond with the Late Villafranchian of Eutrope (MN 18). M. peii, sp. nov. associaied with Trogontherium minus and a primitive Myospalax (M. omegodon) was found in the gray-green clay of Dachai, Xiang-feng, Shanxi, which may be correlated to the lower part of Wueheng loess (or. Zone A of Reddish clay) in China and might be equivalent to the Middle of Villafranchian (MN 17). The association of M. orientalis and M. yovhenicus in Youhe locality is Chardinomys sp., Kowalskia sp., Hipparion houfengensc etc., which indicate a slightly earlier age and may be equivalent to Early Villafranchian (in part of MN 16). Mimomys sp. l from Xicun, Tunliu, Shanxi probably represents the first appearance of this genus in China. We are not sure at present, however, whether the Xicun fauna, including Hipparion sp., Gazella of. blacki and Stegodon cf. chaii etc., can be

本文详细综述了中国的 Mimomys 属材料.分布青海共和、甘肃合水、河北阳原及辽宁林西的 M. (Villanyia) chinensis Kormos、在甘肃合水与 M. gansunicus Zheng 共生,其时代为泥河湾期(或晚维拉方期,相当于 MN 18); 分布陕西渭南、山西平陆、榆社及河北阳原的 M. orientalis Young 和欧洲种 M. stehlini Kormos、分布渭南的 M. youhenicus 和欧洲种 M. kretzoii Fejfar 分别处于大致相同的进化阶段并和一个与 M. banchiaonicus 相似的种类共生, 其时代均为游河期(或早维拉方期,相当于 MN 16); 山西襄汾的 M. peii sp. nov. 的时代为大柴期(或中维拉方期,相当于 MN 17); 山西离石的 M. cf. intermedius (Newton) 的时代为泥河湾期;山西屯留的 Mimomys sp. 的时代可能偏早,为西村期(可能相当于路西南期或 MN 15).

The present paper deals with a new genus and species, Bothriostylops notios of Arctostylopidae secured from the Late Paleocene Wangwu Member, Chijiang Formation in Jiangxi Province. "Sinostylops progressus" discovered from the Shuangtasi Group of the Early Eocene, Xuancheng Basin in Anhui Province is here assigned to Bothriostylops progressus based on its cheek tooth structure. A close relationship between Asiostylops found from the Late Paleocene Langnikeng Member of Chijiang Formation and the new form i also...

The present paper deals with a new genus and species, Bothriostylops notios of Arctostylopidae secured from the Late Paleocene Wangwu Member, Chijiang Formation in Jiangxi Province. "Sinostylops progressus" discovered from the Shuangtasi Group of the Early Eocene, Xuancheng Basin in Anhui Province is here assigned to Bothriostylops progressus based on its cheek tooth structure. A close relationship between Asiostylops found from the Late Paleocene Langnikeng Member of Chijiang Formation and the new form i also proposed. Notounguhta Roth, 1903 Arctostylopidae Schlosser, 1923 Bothriostylops gen. nov. Type species Bothriostylops notios sp. nov. Referred species Type species, B. progressus (=Sinostylops progressus Tang and Yah, 1976) and Bothriostyloos sp.. Age and distribution Late Paleocene to Early Eocene of South China. Diagnosis Lower jaw laterally compressed and slightly convex ventrally. Cheek tooth brachyodont with deep median external groove, convex external wall and developed cingula on anteroexternal margins. P_4 incipiently molariform with nearly crescentic talonid. Talonids longer than trigonids on molars with elongate crescentic lophids and simple but distinct entoconid crests. Bothriostylops notios sp. nov. Type A left lower jaw with P_4-M_3 (V 7642). Horizon and locality Late Paleocene Wangwu Member, Chijiang Formation. North of Zhulin Hill, Dayu County, Jiangxi. Diagnosis As for the genus. Description Mandible laterally compressed and slightly convex along ventral border, being 4.7, 5.5 and 4.6 mm. high below P_1, M_2 and M_3, respectively. Cheek tooth low crowned and arranging closely. Tooth crown convex externally with a deep median external groove. All premolars have not been preserved except P_4 which damaged an- teriorly. P_4 somewhat molariform, elongate anteroposteriorly, with robust metaconid and nearly crescentic talonid which is less than half of the trigonid in length. The talonids of the first two lower molars longer than the trigonids. The paraconid of M_1 lower positionaly, anterointeriorly to the high protoconid, and connected with the latter by a slightly bended crest; metaconid robust but damaged on the top; talonid lower than trigonid, its anterior wing of external crescent meeting the trigoaid near the midline rather than internal; entoconid lower, transverse crest broken. M_2 similar to M_1 in size and in trigunid morphology, entoconid higher than that on M_1, transverse crest slant rather than transverse. M_3 the biggest of the three lower molars, talonid two and half times as long as trigonid, hypoconulid extremely high and robust, forming a crest-shaped third lobe. Comparison Bothriostylops notios resembles Asiostylops and "Sinostylops progressus" in mandible and cheek tooth structure. It similar to Asiostylops in narrow lower jaw, nearly equal size of M_1 and M_2, convex external wall, deep median external groove and having rather developed anteroexternal cingulum, but different from the latter in relatively small P_4 with incipient crescentic talonid; short trigonid and long talonid as well as strong transverse crest on the lower molars. Above features indicate that Asiostylops is more primitive than Bothriostylops. The characters, such as convex external wall, deep median external groove, rather developed a nteroexternal cingulmn and high metaconid on the lower molats, also occurred in "Sinostylops progressus". However, the latter has higher crown, more molariform P_4 and stronger transverse entoconid crest on the molars than B. notios does, demonstrating tha "Sinostylops progressus" is more progressive. Bothriostylops sp. Material A left lower jaw with all the teeth broken except M_3 (V 7646). Horizon and locality As for Bothriostylops notios. Remarks M_3 on specimen No. V 7646 possesses large metaconid, compressed trigonid, high and robust hypoconulid and crested third lobe, demonstrating that it resembles that of B. notios and should be pertained to the same genus. But it differs from B. notios in having relatively longer mandibte. Discussion 1. On the systematic position of the species "Sinostylops progressus" Sinostylops was created by Tang and Yan in 1976. It originally contained two species-S. promissus and "S." progressus. The former was found from the Late Paleocene, Upper Member of Doumu Formation, Qianshan Basin, Anhui and the latter from the Early Eocene Shuangtasi Group. With a careful observation on the materials of the above two species, we feel strongly that it is hard to place them to one genus. The type species (S. promissus) has only one lower jaw with cheek teeth broken lingually and much worn crown surface. All can be seen are the flat and steep external walls, weak anteroexternal cingulum and straight ventral border of the horizontal ramus. Nevertheless, they reveal that S. promissus is very different from "Sinostylops progressus" which is here removed to Bothriostylops progressus. As B. progressus has lower molars with high metaconid, deep median external groove and convex external wall, which resemble those of B. notios, it is pertained to the genus Bothriostylops reasonably. These common features together with the differences between the two species mentioned above indicate they have not only close relationship but also different evolutional level .B. progressus seems to be the descendant of B. notios. Both species share many similar characters with Asiostylops and are related to the latter rather than Sinostylops or other Arctostylopids as previously thought. 2 The age of the Wangwu Member In Wangwu Member of Chijiang Formation were found mammalian fossils, including three species previously described. Archaeolambda sp. is the common member of Late Paleocene to Early Eocene age in Asia. Allostylops periconotus Zheng seems to be closely similar in morphology to those of Arctostylopids known from the Late Paleocene or the Early Eocene Gashato Formation and Naomugen Formation in spite of that the latter forms are more specialized. Jiangxia chaotoensis Zhang et al. appears to be more primitive than those of the Eocene species, As mentioned above, B. notios is a transitional form between Asiostylops (Late Paleocene age, found below B. notios in the same section) and B. progressus (early Early Eocene) in the evolution. So it is natural that the discovery of B. notios further strengthens the opinion that Wangwu Member is of late Late Paleocene in age.

本文主要记述了南方有蹄目北柱兽科一新属新种——南方沟柱兽 (Bothriostylops notios gen. et sp. nov.).化石发现于江西池江盆地晚古新世池江组.新属牙齿形态与其他已记述的北柱兽科种类均有一定的差别,但与稀少亚洲柱兽 (Asiostylops spanios) 和原"中华柱兽"进步种 ("Sinostylops" progressus) 在系统关系上比较密切.本文初步讨论了"中华柱兽"属中有关种的分类和归属问题.

 
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