广州鱼类单殖吸虫似伪指环虫属一新种及一新纪录

DESCRIPTION OF ONE NEW SPECIES AND ONE NEW RECORD OF PSEUDODACTYLOGYROIDES OF FISHES FROM GUANGZHOU

记述了寄生于尖尾鱼Oxyurichtyspapuensis (Cuvier&Valenciennes)鳃上的似伪指环虫属 1新种和寄生于嵴塘鳢Butisbutis (Hamilton)鳃上的似伪指环虫属我国 1新纪录种。尖尾鱼似伪指环虫Pseudodactylogyroidespapuensissp .nov.与PseudodactylogyroidesmarmorataeLim ,1995和PseudodactylogyroidesbutisensisLim ,1995相似 ,但新种中央大钩的内外突分化不如已知种明显 ,且在内突上没有明显的凹陷 ,附加片的形态相似 ,但已知种的附加片与中央大钩相连 ,而新种的附加片与中央大钩完全断开 ,量度上也有明显的差异 ,新种交接管据弯度长0 0 2 8～ 0 0 4 5较已知种 (分别为 0 0 8～ 0 10mm和 0 13～ 0 15mm)短。尖塘鳢似伪指环虫PseudodactylogyroidesmarmorataeLim ,1995与原始描述相比 ,除中央大钩和交接管稍长外 ,其形态基本一致。

One new species and one new record of Pseudodactylogyroides Ogawa,1986 are described.Type specimens are deposited in the Department of Bio- logy, Guangzhou University and Department of Biology,South China Normal University.All measurements are in millimeter.1 Pseudodactylogyroides papuensis sp. nov.(Figs.1-3) Host.Oxyurichtys papuensis(Cuvier & Valenciennes). Location.Gills. Locatity.Guangzhou(23.2°N,113.3°E),Guangdong Province. Date.16 Apr.,19 Apr.2003. Type specimens.holotype Gdgz 20030416-1,paratype Gdgz 200304-2-20. Body of medium size,(0.456-0.540)×(0.121-0.167).Pharynx(0.036-0.042)×(0.031-0.036) in size.Opisthohapter(0.025-0.031)×(0.020-0.029) in size.Marginal hooklets 0.014-0.016 in length.Big central large anchors.0.056-0.066 in total length,basal portion.0.045-0.056,inner root 0.014-0.018,outer root 0.003,point 0.027-0.032.Accessory piece is on top of inner roots of large anchors and separate from the top of inner root,triangular,(0.019-0.027)×(0.010-0.011).Only one connective plate present,(0.034-0.042)×(0.006-0.010) in size.Small central large anchors 0.013-0.020 in total length.Fourteen marginal hooks of larval type, arranged around edge of haptor except for one central pair. Testis ovoid,post-ovarian.Vas deferens arising from anterior part of testis on dorsa side,looping round left intestinal limb onto ventral side,dilating near basal portion of copulatory tube forming seminal vesicle,seminal vesicle.0.012-0.036. Copulatory organ consist of copulatory tube and supporting apparatus.Copulatory tube curved,0.028-0.045 in total length including curves.Supporting apparatus slender piece-shaped and connecting to the distal portion of copulaory tube,(0.031-0.045)×(0.002-0.003).Ovary long-ovoid,in midbody,(0.082-0.098)×(0.035-0.049) in size.Uterine tube dilating forming seminal receptaculum,vagina is opening dextral body and near copulatory organ.Vitellarium well developed,co-extensive with intestine. Description is based 2 alive specimens and 10 mounted specimens. Remarks.This new species is compared with P.apogonis,the structures and measurements of central anchors and copulatory tube differ.The new species is similar to P.marmoratae and P.butisensis in chitinous structures of the haptor and copulatory organ,but differ in:1)the differentiation of inner root and outer root is not as obvious as the latter and there isn′t obvious indentation on the inner root;2)accessory piece of the present species separate from the top of inner root but connect in the latter,there is obvious difference in the measurement;3)the size of copulatory tube is about shorter than those of P.marmoratae by 1/2-2/3 and those of P.butisensis by 2/3-4/5.2 Pseudodactylogyroides marmoratae Lim,1995(Figs.4-5) Host.Butis butis(Hamilton). Location.Gills. Locatity.Guangzhou(23.2°N,113.3°E),Guangdong Province. Date.24 Apr.,7 May 2003. Worm of large or medium size,(0.791-1.321)×(0.093-0.195).Pharynx(0.025-0.062)×(0.025-0.059) in size.Opisthohapter 0.158×(0.093-0.130) in size.Marginal hooklets 0.016-0.017 in length.Big central large anchors 0.118-0.123 in total length,basal portion 0.090-0.095,inner root 0.031-0.034,outer root 0.011,point 0.048-0.050.Accessory piece is on top of inner roots of large anchors and there is a small sutural groove between them,triangular,(0.053-0.056)×(0.017-0.020) in size.Only one connective plate present,0.062×(0.011-0.018) in size.Small central large anchors 0.011-0.018 in total length,inner root 0.006-0.008,outer root 0.006-0.008. Copulatory organ consist of copulatory tube and supporting apparatus.Copulatory tube curved,0.087-0.106 in total length including curves.Supporting apparatus slender piece-shaped and connecting to the distal portion of copulatory tube,0.045-0.046 in length.Vagina and egg not observe. Description is based on 4 mounted specimens. Remarks.The shape and all dimensions of this worm basically agree with original description except that the length of copulatory tube and supporting apparatus are slightly long,there is a small sutural groove between big central la