【摘要】 <正> Herzenstein(1888)将采自青海湖、黄河上游和柴达木等地的背鳍最后不分支鳍条为硬刺、腹腔内有发达的游离膜质鳔和尾柄侧扁的条鳅,命名为硬刺条瞅Nemachilus sclero-pterus,并以青海湖的标本为模式标本。我们比较了不同地区的硬刺条鳅,发现Herzens-tein描述的硬刺条鳅中还包括了另一个不同的种——拟硬刺条瞅Nemachilus pseudosclero-更多还原

【Abstract】 Nemachilus pseudoscleropterus, sp. nov. (fig. 1) Nemachilus scleropterus Herzenstein, 1888: 54-58 (in.part) (upper Huang He riversystem and Zaidam) Holotype: No. 75066, ?, total length 119 mm, body length 100 mm, collected from atributary of Golmud He (Qaidam Pendi), June 10, 1975. Allotype: No. 75068, ?, totallength 100 mm, body length 83 mm, collected with the holotype. Patatypes: 35 specimens,collected from Golmud He (Nos. 65046-75068, 75066-75080), Xiangride He (Nos.730452-730455) and Nur He (Nos. 75081-75095), in May 1973 and June 1975. Distribution: Qaidam Pendi and upper Huang He system. Diagnosis: This new species resembles N. scleropterus Herz. and N. wuweiensis Liet Chang, but may be distinguished by the free air bladder being connected directly withthe bilobed anterior portion, not by means of a long tube as in the latter two species. InN. scleropterus, there is an appendix between the intestine and the ventricle, but in thenew species and N. wuweiensis such an appendix is absent. The dorsal fin of N. wuwei-ensis has 7 branched rays, whereas that of N. scleropterus and the new species has 8. Nemachilus pseudoscleropterus markehenensis, subsp. nov. (fig. 4) Holotype: No. 71005, ?, total length 126 mm, body length 104mm, collected fromthe Marke He (Baiyu, jigchi Xian), August 1971. Allotype: No. 71004, ?, total length130 mm, body length 108 mm, collected with the holotype. Paratypes: Nos. 71001 and71003, collected from the same locality as that of the holotype. Diagnoais: This new subspecies differs from the nominate subspecies in havingmore (15-17: 11-13) gill-rakers on the inner row of the first gill arch and the lowerjaw with a sharp and evenly rounded edge. Type.specimens are deposited in the Northwest Plateau Institute of Biology, Aca-demia Sinica.更多还原