丰宫并殖吸虫的研究

目的　鉴定丰宫并殖吸虫与“勐腊并殖吸虫”的同一性。　方法　从丰宫并殖吸虫与“勐腊并殖吸虫”的同一流行区采集溪蟹,分离囊蚴及后尾蚴 ,观测后作感染实验 ,收集成虫制片观测鉴定。　结果　丰宫并殖吸虫囊蚴的大小平均为 (1.23±0.0 87)mm×(1.10±0.073)mm ,极少数形成一层极薄易破的囊壁 ;后尾蚴大小为 (2.01±0.71)mm×(0.62±0.12)mm ,排泄囊在腹吸盘以前呈不规则的树枝状 ,两肠支末端尖细终止于距体末1/6处;成虫子宫团庞大,平均长度为体长的1/4.2。丰宫并殖吸虫的适宜终宿主为大鼠 ,猴、犬、猫均为不适宜宿主。“勐腊并殖吸虫”的囊蚴取自同一蟹体的小睾并殖吸虫囊蚴 ,后尾蚴同丰宫并殖吸虫 ,而成虫实为童虫。　结论　确认丰宫并殖吸虫为独立虫种,“勐腊并殖吸虫”为标本混淆不清的误定虫种 ,应属无效种名。

Studies on Paragonimus proliferus

OBJECTIVE: To make identification between Paragonimus menglaensis and Paragonimus proliferus. METHODS: Crabs were collected from same area where P. proliferus and P. menglaensi were reported, metacercariae and excysted metacercariae were separated. Adult worms were collected from experimental infection and identified. RESULTS: The metacercaria is large, with an average size of (1.23 +/- 0.087) mm x (1.10 +/- 0.073) mm, covered with a thin and fragile cyst wall; the size of excysted metacercariae is (2.01 +/- 0.71) mm x (0.62 +/- 0.12) mm, with irregular bough-like wrinkles excretory bladder resembling in front of ventral sucker, two pointed and slim distal ends of gut locate at 1/6 of the body from the tail end; the adult worm has large uterine mass, with an average length of 1/4.2 of the whole body. The natural definitive host for P. proliferus is not monkeys, dogs, and cats, but rats. The metacercaria of the reported P. menglaensis has been mixed up with that of P. microrchis from the same crab, excysted metacercaria has been same to that of P. proliferus, and an immature worm has been mistakenly identified as its adult worm. CONCLUSION: P. proliferu is a valid independent species, while P. menglaensis is a mis-identified, invalid one.