|其他题名: ||Taxonomic revision of species and phylogenetic analysis of interspecific relationships within the cyprinid genus Onychostoma sensu lato Günther, 1896|
|摘要: ||运用多变量形态度量学方法，研究鲃亚科的鱼类类群——白甲鱼属鱼类的形态差异。对在分类上存有疑问的种或亚种进行分析，对发现分布于长江下游支流秋浦河的一个新种——中间白甲鱼的形态和分类地位进行了重点的描述；通过对19个框架测量距离进行主成分分析及各种统计分析，来讨论白甲鱼属鱼类的物种有效性。选择高须鱼属、吻孔鲃属、倒刺鲃属和光唇鱼属等7个物种作为外类群，用分支系统学方法及原理重建广义白甲鱼属鱼类的12个物种种间系统发育关系。选取98个骨骼学及外部形态学性状进行描述和比较，数据矩阵应用Hennig 86软件进行简约性分析。主要研究结论表述如下：
5 越南学者描述的红河水系的三个新物种，即O. thachaensis, O. yeni和O. babeensis，应该是盖氏白甲鱼的初级同物异名。
|英文摘要: ||Multivariate morphometrics (Principal Component Analysis, PCA) was employed to investigate the distinctness of species of the barbine cyprinid genus Onychostoma Günther, 1896. The PCA was performed for 19 measurements among the problematic species or subspecies in the genus.Based on above results, the validity of these species or subspecies is evaluated. Interspecific relationships of 12 species of Onychostoma sensu lato were reconstructed based on cladistics methodology and morphological data. 7 species of Acossocheilus, Hypsibarbus, Poropuntius, and Spinibarbus were chosen as outgroups. A total of 98 variable osteological and external anatomical characters was observed and described. The data matrix is subjective to the parsimony analysis using the Hennig 86 software in Winclada 1.00 08. The following conclusions and hypotheses were reached:
1 A total of 18 valid species of Onychostoma sensu lato are here recognized and subdivided into three groups based on the mouth opening width and postlabial groove length. The narrow mouth-opening (type I) group is composed of those species with small mouth opening which width being less than the corresponding head width, and a long post-labial groove extending along about two-thirds of the side of the lower jaw, including O. lini, O. barbata; moderate mouth-opening (type II) group is composed of those species with mordetat mouth opening which width being equal to or slightly less than the corresponding head width, and a short post-labial groove that extends along around half of the side of the lower jaw, including O. ovale, O. rara, O. brevis, O. fangi, O. elongatum, O. intermedium, O. daduensis, O. simum, O. angististomata, O. fusiforme, O. meridonale, O. macrolepis; and wide mouth-opening (type III) group is composed of those species with wider mouth opening which width being greater than the corresponding width of the head, and a short post-labial groove restricted only to the side of the lower jaw, including O. lepturus, O. gerlachi, O. barbatula and O. alticorpus.
2 Onychostoma intermedium is here described as a new species from the Qiupu He, a tributary of the lower Yangtze River drainage at Shitai County, South Anhui Province, southern China.
Onychostoma intermedium, sp. nov
Holotype IHB 83IX2146, 145.7 mm SL, Qiupu He, a tributary on the southern bank of the lower Yangtze River, in Shitai County, southern Anhui Province, South China.
Paratypes IHB 83IX2144-5, 83IX2147-8, 4 specimens, 127.9-138.1 mm SL, other data same as holotype.
Diagnosis This new species with O. fusiforme and O. meridionale, has a longitudinal dark brown stripe extending along the lateral line on each side of the body, which can distinguish them from all other congeners of the moderate-mouth group. It differs from both in the presence or absence of two pairs of barbels in adults, from O. fusiforme in the body depth, thickness of the caudal peduncle, and positions of pelvic and anal fins, and from O. meridionale in the structure of the last simple dorsal-fin ray.
All type specimens are kept in the Freshwater Fish Museum of the Institute of Hydrobiology, Chinese Acadamy of Sciences, Wuhan, Hubei Province.
3 The subspecific status of O. o. ovale and O. o. rhomboids is not warranted based on the principal component analysis and covariate analysis.
4 The discovery of O. fusiforme in the Lancang Jiang drainage of China is the new record of its known distribution.
5 Three Vietnamese species, i.e O. thachaensis, O. yeni and O. babeensis. are affirmed to be junior synonyms of O. gerlachi.
6 Onychostoma sensu lato, as currently defined, is not a monophyletic, but polyphyletic group.
7 Onychostoma sensu strict, as here defined, is a monophyletic group and it can be subdivided into two subgenera. The subgenus Scaphesthes is composed of those species having a wide mouth-opening and Onychostoma includes those species with a moderate mouth-opening except for O. macrolepis.
8 The sister group of Onychostoma s. str. is the one represented by the barred species of Acrossocheilus except for A. monticola and likely A. clivosius.
9 Onychostoma lini and O. barbata should be assigned to their own generic rank, so is O. macrolepis.|
|Appears in Collections:||中科院水生所知识产出（2009年前）_学位论文|
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