叶形属吸虫三新种记述(吸虫纲:发状科)

THREE NEW SPECIES OF TREMATODE OF GENUS Phyllodistomum (Trematoda: Gorgderidae)

本文记载了采自鱼类膀胱中的叶形属(Phyllodistomum)吸虫三新种:鮈叶形吸虫P.Saurogobio;鮠叶形吸虫P.leiocassis;及崇仁叶形吸虫P.congrenensis;对三新种的形态结构特征作了较详尽的描述,并与属内其它近似种进行了比较。

The present paper reports three new species of genus Phyllodistomum, collected from the excretory bladder of fresh-water fishes in Nanchang, Xiushui, Congren of Jiangxi Province, China. Type specimens are kept in the Scool of Animal Husbandry and Fishery of Jiangxi Province. 1. Phyllodistomum saurogobio sp. nov. This new species resembles P. acceptum Looss, 1901 and P. cameroni Agrawas, 1966, but differs from above two species in the features of the body, such as: 1 ) There are many papillae on the surface of the body; 2 ) Genital pore is situated at the frontal edge of the ventral sucker. This new species also differs from P. undulans Steen, 1938 in the following features: 1 ) There arc definite distance from the acetabulum to the vitellaria; 2 ) Acetabulum is about equal to the oral sucker in size but does not over lapping the caeca; 3 ) Testes are deeply lobed. Host: Saurogobio dabrye Bleeker. Location: Nanchang. 2. Phyllodistomum leiocassis sp. nov. This new species is similar to P. lewisi Srivastava, 1938 and can be distinguished easily from the following features: 1) The region of the anterior testis is the widest; 2 ) Testes are deeply lobed; 3 ) Eggs are larger. This new species also resembles P. macrobrachiola Yamaguti, 1934, but the former is distingushable from the latter in the following features: 1 ) The body is larger in size; 2 ) Testes are deeply lobed; 3 ) Ventral sucker is not over lapping the caeca. P. singhiai Gupta, 1951 is close to this new species but 1 ) The length of former's body is over 2.5 times as long as the width of the body. 2 ) Eggs are smaller. Host: Leiocassis macrops Nichis. Location: Xiushui; Fuzhou. 3. Phyllodistomum congrenensis sp. nov. This new species resembles P. dogiei Piguleusky, 1953 and P. simile Nybelin, 1926, but differs from the latter in the following feature: 1 ) The acetabulum is about equal to oral sucker in size; 2 ) Acetabulum is over lapping the caeca; 3 ) Eggs are larger. This new species is also different from P. lewisi Strvastava, 1938 and P. singhiai Nybelin, 1926 in the folloeing feature: 1 ) The back half of the body is nearly round; 2 ) Eggs are larger. 3 ) Testes arc deeply lobed. Host: Leiocassis partti (Gunther) and L, crassilaris (Dybowski). Location: Congren; Pinxiang.