三钩虫属(单殖吸虫,锚首虫科)2外来种的描述

记述了锚首虫科Ancyrocephalidae三钩虫属Trianchoratus Price et Berry(1966)2外来种,即寄生在接吻鱼Helostoma temm incki和毛足鲈Trichogaster trichopterus鳃上的2种单殖吸虫,分别是无棒三钩虫Trianchoratus acleithrium Price et Berry(1966)和毛足鲈三钩虫Trianchoratus trichogasteriumL im(1986).对2外来种进行了形态描述并给出特征图.

Two exotic species of Trianchoratus Price et Berry(1966)(Monogenea, Ancyrocephalidae)

Two species of Trianchoratus Price et Berry(1966)(Ancyrocephalidae) are reported in China for the first time,Trianchoratus acleithrium Price et Berry(1966),parasitized on gills of Helostoma temmincki and Trianchoratus trichogasterium Lim(1986),parasitized on gills of Trichogaster trichopterus. 1.Trianchoratus acleithrium Price et Berry(1966)(Fig.1:a,b,c,d,e)Host:Helostoma temmincki(Cuvier et Vallenciennes).Body size 0.305(0.250～0.350)×0.102(0.060～0.160),hapter set off from body,0.053(0.040～0.088)×0.077(0.065～0.107) in size,with three developed and one degenerate into the acicular central anchors,haptoral bar absent.Dorsal anchors unequal,one anchor rudimentary,another anchor developed,0.030(0.029～0.031)in total length,basal portion 0.026(0.025～0.028),point 0.013(0.008～0.015),inner root 0.017(0.013～0.019),outer root 0.005(0.004～0.007).Ventral anchors equally developed,0.039(0.038～0.040)in total length,basal portion 0.033(0.029～0.035),point 0.014(0.013～0.015),inner root 0.020(0.018～0.021),outer root 0.009(0.006～0.012),rudimentary anthor 0.013(0.010～0.016).Marginal hooks 7 pairs,0.013(0.012～0.014)in length.Copulatory organ consisting of slightly coiled tube and end biforked accessory piece,copulatory tube 0.082(0.070～0.098)in length.Vagina dextral with sclerotised funnel-like opening and short vaginal tube.2.Trianchoratus trichogasterium Lim(1986)(Fig.2:a,b,c,d,e,f)Host:Trichogaster trichopterus(Pallas)Body size 0.266(0.210～0.340)×0.076(0.060～0.110),hapter set off from body,0.056(0.040～0.080)×0.074(0.042～0.091)in size,with three developed and one degenerate into the acicular central anchors,haptoral bar absent.Dorsal anchors unequal,one anchor rudimentary,another anchor developed,0.038(0.035～0.042)in total length,basal portion 0.032(0.029～0.036),point 0.015(0.012～0.016),inner root 0.018(0.014～0.020),outer root 0.009(0.006～0.012).Ventral anchors equally developed,0.030(0.025～0.031)in total length,basal portion 0.024(0.020～0.026),point 0.017(0.015～0.020),inner root 0.014(0.010～0.017),outer root 0.006(0.003～0.008),rudimentary anthor 0.012(0.010～0.014).Marginal hooks 7 pairs,0.012(0.010～0.014)in length.Copulatory tube slightly coiled,0.076(0.042～0.090)in length,supporting apparatus 0.023(0.018～0.026)in length.Vagina dextral with sclerotised funnel-like opening and curving vaginal tube.