摘要
作者于1955年冬和1956年夏，先后发表了关于寄生鲩鱼和青鱼的原生动物。本文是这一研究的第三部分，记述鱅和鲢两种家鱼中所发见的各种原生动物共21种．其中已见诸文献的种类14种，新种6种，未定种一种。这些种在分类系统上位置如下：
The present paper embodies the results of studies on the protozoan parasites from 389 individuals of Aristichthys nobillis and Hypophthalmichthys molithrix.Apart from the species of Myxosporidia 20 species have been re- corded,among them,14 species are previously known,namely,Euglenosoma branchialis Davis,Cryptobia branchialis Nie,Costia necatrix Henneguy, Glugea hertwigi Weissenberg,Dermocystidium percae Reichenbach-Klinke, Hemiophrys macrostoma Chen,Chilodonella cyprini Moroff,Glaucoma pyriformis Schew.,Ichthyophthirius multifiliis Fouquet,Trichodina pediculus Mueller,T.bulbosa Davis,T.oviformis Chen,Glossatella cylindriformis Chen and Trichophrya sinensis Chen.The remaining 6 species are new to the science,their diagnosis are now summarised as follows: 1.Trypanosoma aristichthysi sp.nov.(Pl.Ⅰ,Figs.5—8)is found from the circulatory system.It has a breadth of 1.2 μ and total length of 31.6 μ The free flagellum is 8.3 μ long.There is a well developed undulating mem- brane which exhibits 5—6 folds.An oval or ellipsoidal nucleus is situated 38% of the total length from the anterior extremity.The cytoplasm contains a few vacuoles.The kinetonucleus is ovoid or ellipsoid in shape,and situated 8% of the body length from posterior end.The blepharoplast is hardly discernible. 2.Cryptobia agitata sp.nov. (Pl.Ⅱ,Figs.9—14)often occurs in enormous numbers on the gill filaments or body surface of the hosts,especially in the case of young fishes.It is triangular or elongated in shape.A blepharoplast is situated at the left side,and about one third of the body length from the anterior extremity.The two flagella,arising from the btepharoplast,are of unequal length.One is anteriorly directed and about the same length as the body,while the posteriorly directed one,which may be attached to the surface of the body for a short distance,is about 1.5 of the length of the body.A rounded nucleus is located near the right side of the middle of the body and contains spherical granules of chromatin,attached to the nuclear membr
出处
《水生生物学集刊》
1956年第2期279-298,i046-i053,299,共29页
