四川省鱼类复殖吸虫一新种

ONE NEW SPECIES OF DIGENETIC TREMAIODES FROM FISHES OF SICHUAN PROVINCE IN CHINA(Digenea:Bucephalidile)

描述了复殖吸虫一新种（Ｂｕｏｅｐｈａｌｏｐｓｉｓｓｉｃｈｕａｎｅｎｓｉｓｓｐ．ｎｏｖ．），并与相似种（Ｂ．ＰｓｅｕｄｏｂｏｇｒｉＷａｎｇ，１９８０）进行了比较，该新种是在四川产的鲶类鱼（大鳍）的肠道中发现的，模式标本保存在西南师范大学生物系。

A new species of digenetic trematodes,Bucephalopsis sichuanensis, is described.Type specimens are deposited in the department of biology,Southwest China Normal University.Bucephalopsis sichuanensis sp. nov.Its body rod-shaped,with blunt anterior and rounded peterior extremity, spined densely in fore body and sparsely in hind body; anterior one-third part of body tapering anteriorly up to rhynchus,pos-terior one-fifth part of the body a little smaller and the middle part subequal;size 1.425(0.896～2.008)×0.414(0.192～0.560)mm,Rtiynchus snckel-like,0.142(0.084～0.168)×0.129(0.072～0.160)mm,Mouth ventral,at approximately anterior one-third level of body, Pharynx ellip-soidal,0.104(0.068～0.312)×0. 085(0.070～0.110)mm。Esophagus very short,0. 059(0.026～0.080)in length.Intestinal sac pre-equatorial,0. 184(0.120～0.240)×0.135(0.080～0.176)mm, extending a little forwards,Excretory vesicle long,extending anteriorly either up to anteri-or level of anterior testis(mature body)or up to anterior to inteeltine(inmature body),excretory pore at the hind end of the body.Testes spherical or ell ipsoidal,subequal,laterally tandem or diagonal,separated from each other.Anterior testis 0.214(0.120～0.256)×0.143(0.104～0.224)mm,posterior testis 0.198(0. 112～0.264)×0.172(0.088～0.240) mm, Cirrus sac slender, a little sinuous, lying in hind part of the body,0.359(0.264～0.296)×0.076(0.056～0.088)mm,Vesicula seminalis oval.Pars prostatica tubular surrounded by a large number of prostate gland cells,Genital pore subterminal.Ovary subepherical,equatorial, pretesticular,0.160(0.092～0.208)×0.137(0.080～0.176) mm, Vitelline pands comprise 22 to 28 spherical follicles , situated at fore body in front of o-vary in the form of arc,0.042(0.030～0.056)×0.038(0. 026～0. 046)mm,Uterus with numer-ous eggs,coiled,lying between the arc of vitelline follicles and genital pore.Eggs oval,with a process,and the larger the egg,the shorter the process,0.028(0.018～0.033)×0.015(0.01 0～0.017)mm in live specimens,0.025(0.014～0.031)×0.014(0.008～0.021)mm after fixation.Host:Mystus macropterus (Bleeker)。Location:Intestine。Laslity: Fujiang River,Hechuan County(30°N, 106°15′E);Jialing River,Beibei(29°49′N, 106°25,E),sichuan Province。Data:March 23 and August 18,1987。The new species resembles B,pseudobagri Wang,1980,but differs from the latter in possessinglarger posterior testis and ovary,shorter cirrus pouch and smaller eggs, spines on whole body,22～28 vitelline follicles arranged in the form of arc, and in the absence of memberane on anterior marginof rhynchus.