【摘要】 本文报道在内蒙科尔沁草原检查5种淡水螺:耳萝卜螺、卵萝卜螺,豆螺、凸旋螺及半球多脉扁螺共5,616粒。从中查出至少12种吸虫幼虫期,它们是:土耳其斯坦东毕吸虫、有棘血居吸虫、马蹄吸虫、斜睾吸虫、二种背孔吸虫、棘口类吸虫、重盘吸虫、球孔吸虫、异形科吸虫、杯叶科吸虫及鹗形吸虫。其中东毕吸虫、血居吸虫及棘口吸虫的尾蚴分别进行实验动物的感染试验,获得成虫。各吸虫侵袭期幼虫季节动态亦经观察。更多还原

【Abstract】 This paper reports the results of an investigation on the larval trematodes in fresh water mollusca collected from grasslands in Koersin Pasture, situated near forty seven degrees north latitude and 122 degrees east longitude, with the temperature over zero degree for only 90-110 days in each year. In this paper the life history of larval trematodes in two species has been studied.There are 12 species of larval trematodes found from five species of fresh water mollusca in Koersin Pasture. The 12 species of larval trematodes and their snail hosts are listed below:(1) Orientobilhiarzia turkestaniea Skrjabin, 1913: (Schistosomatidae) Radix aurieularia 4.47% (57/1274); R. ovata 3.9% (93/2386).(2) Sanguinicola armata Plehn, 1905: (Sanguinicolidae)R. avricularia 3.22% (79/2451); R. ovata, 2,51% (76/3027); Bithynia. sp. 0.86% (1/116).(3) Maritrema sp.: (Microphallidae) Bithynia sp; 25% (29/116).(4) Phgiorchis sp.: (Plagiorchiidae)R. auricularia 3.43% (84/2451); R. ovata 1.32% (40/3027).(5) Notocotylus sp.: (Notocotylidae) Bithynia sp. 9.3% (4/43).(6) Notocotylus sp.: (Notocotylidae)R. auricularia 0.28% (7/2451); R. ovata 0.20% (6/3027).(7) Echinostoma spp.: (Echinostomatidae)R. auricularia 2.57% (63/2451); R. ovata (113/3027).(8) Diplodiscus sp.: (Paramphistomidae) Gyraulu-s convexiusculus 7.14% 0/14).(9) Sphaeridiotrema sp.: (Psilostomatidae) R. auricularia 1.43% (35/2451); R. ovata 0.40% (12/3027); Bithynia sp. 6.98% (3/43).(10) Heterophyidae sp.-. (Heterophyidae) Bithynia sp. 9.3% (4/43).(11) Cyathoeotyle sp.: (Cyathocotylidae) Bithynia sp. 2.33% (1/43). (12) Strigeidae spp.: (Strigeidae)R. auricularia, 0.86% (21/2451); E. ovata 1.12% (34/3027); Polypylis he-misphaerula 25% (2/8).Most of the snails were found to contain mature cercaoae in July and August, even more numerous in August than in July. In September almost all the mathure cercariae in all species of these trematodes disappeared on Kowsin Pasture.更多还原