铜鱼寄生三代虫一新种的记述

A NEW SPECIE OF GYRODACTYLUS NORDMANN FROM COREIUS HETERODON BLEEKER

本文报道我国长江中游铜鱼鳃部寄生的三代虫一新种,即:铜鱼三代虫(新种)Gyrodactylus coreiusisp.nov.,新种的形态特征及其与相近种之间的差别在文中进行了描述和比较。

A new specie of Gyrodactylus from Coreius heterodon of freshwater fishes in the Yangtze valley is identified. All the measurements used in the decriptions of new species are in millimeter. Type specimens are deposited in the Laboratory of Fish Diseases, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan. gyrodactylus coreiusi sp. nov. （Fig. 1） Host： Coreius. heterodon Bleeker Location： Gills, nasal cavity Locality： the Yangtze valley （Yidu city of Hubei province） Descriptions （based on 3 specimens）： Body small in size, being 0. 313-0. 422mm long and 0. 06-0. 071mm wide. Marginal hooklets ordinarily typed, their total length 0.024-0.032mm. Total length of anchors 0.053-0.061mm. The basal portion 0.016-0.02mm, handle 0.04-0.046mm and point 0.026-0.032mm in length, respectively. Ventral bar 0.027- 0. 030mm× 0.007-0.011 mm in size, ventral bar membrane 0.012-0. 014mm long. Dorsal bar 0.012-0.018mm× 0. 001-0.002mm in size. Cirrus bulb ellipsoid form, 0.008-0.010mm × 0.005-0.006mm in diameter, and armed with one large and seven small cuticular spines. Remarks： The new specie is similar to G. gobioninum Gussev 1955, G. glehnii Ergens et Gussev 1975, G. gobii Schulman 1953, G. varicorhini Ergens et Ibragimov 1976, G. hemibarbi Ergens 1980 and G. barbi Ergens 1976 in the structure of opisthohaptor, but differs in size and chitinod structure.