鲫鱼寄生车轮虫一新种的研究

本文记述了寄生在鲫鱼(Carassius auratus)体表和鳃上一种新的车轮虫(Trichodina carassii sp.nov.),虫体直径70(54.6—80.4)μm,附着盘直径58(51.6—67.2)μm,齿环直径32(27.0—36.2)μm,齿体25—30个,齿环中央有7—14个旧齿体残余物形成的颗粒结构。大核马蹄形。小核短杆状,在大核一端的外侧,其位置略有变动。口沟390—400°。齿钩镰刀状,齿棘较直,侧面具有若干个缺刻,末端钝圆或平截,近锥体的后方有一个不太明显的小突起。  

STUDIES ON A-NEW SPECIES OF TRICHODINIDS, TRICHODINA CARASSII SP. NOV.

A new species of trichodinids, Trichodina carassii, sp. nov. from the gills, skin and fins of Carassius auratus is described in this paper. The body diameter of this ciliate is 70(54.6—80.4) μm, the diameter of adhesive disc is 58(51.6—67.2) μm and the diameter of denticulate ring is 32(27.0—36.2) μm. The number of denticles ranges from 25 to 30. There are 7—14 granules of remains of old denticles in the centre of denticulate ring when treated with Klein's silver method. The macronucleus is horseshoe-shaped. A short rod-like micronucleus is situated outside the end of one arm of macronucleus, its position being variable. The adoral spiral of the ciliate forms a turn of about 390—400°. The blade is narrow and sickle-shaped. The thorn is relatively straight with uneven dents in the middle portion and its terminal end is round or truncated. The V-shaped corona has a small tumor at its junction with the lower arm.