蚴形属吸虫一新亚属新种Cercarioides(Eucercarioides) hoepplii subgen and sp. nov. (Trematoda:Heterophyidae)

A NEW SUBGENUS AND SPECIES OF TREMATODES,CERCARIOIDES (EUCERCARIOIDES)HOEPPLII SUBGEN. AND. SP. NOV.

本文记述吸虫纲、异形科、蚴形属的一新亚属,定名为何氏蚴形吸虫新亚属及新种Cercarioides(Eucercarioides)hoepplii subgen.and.nov.。标本采自福建福鼎沙埕的黑尾鸥(Larus crassiostris Vieillot)肠管。本文对本类吸虫的宿主分布等问题进行了讨论。

This paper records a new species and new subgenus, of trematodes ,Cercarioides(Eucercarioides)hoepplii subgen, and sp. nov. , belonging to Galactosominae of Heterophyidae. The specimen of this species was collect-ed from black tailed gull, Lotus crassirotris Vieillot, at Sa-chen of Futing, a coastal district of Fujian Province. The whole body of this new subgenus and species of trematodes measures 2. 176mm in length and in greatest width 0. 867mm. Body is divided into anterior and posterior two parts. The length ratio between two parts of body is approximately 1 : 1. The forebody is flat and inverte-heart shape,the hindbody is spindle-shaped. The two parts are divided by a narrow constriction, seminal vesicle eight partite which is filled with spermatozoa ,its narrow terminal tube connects with the genital atrium near the base of the anterior body por- tion. The genital atrium consists of the modified acetabulum and genital sucker ,both being 63.75μm in diame-ter. The vitellaria occupy the extra-caecal regions on both sides of hindbody,extending from a level on the an-terior margin of the ovary to that of the posterior edge of the hind testis. The eggs, 30-37×18.8-22.5μm,are oval in shape. The present species differs from the species of two other suhgenera of Cercarioides in several important characters. The body of new subgenus and species is distinctly divided into forebody and hindbody,while the body of the species in Allocercarioides subgenus is not distinctly divided into two parts. The vitellaria of the new species is distributed along the two columns along two lateral extra-caecal regions of the hindbody,while the distribution of vitellaria in three species of Cercarioides subgenus scatter in the whole portion of the hindbdoy behind the anterior margin of the anterior testis. They are scattered among uterine coils and between two testes. Hosts of the species of Galactosominae are mostly fish-feeding birds,such as Larus spp. ,Puffinus spp. and Sterna spp. ,etc. All these birds are shore birds,hut they also are found from some regions of estuary and mainland. Their distribution regions include Europe ,Asia and extend northward to the Soviet Union and Swe-den.