Waikagul Jitra
Department of Helminthology, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand.
J Parasitol. 2007 Dec;93(6):1496-500. doi: 10.1645/GE-1054.1.
The identification of Paragonimus spp. lung flukes is based on the morphology of both the metacercaria and the adult. A very small Paragonimus sp. metacercaria was found in a freshwater crab caught in Kanchanaburi Province, West Thailand, an area where metacercariae of Paragonimus heterotremus had not been found. The metacercariae cysts were 180-204 microm in diameter, which was smaller than metacercariae of P. heterotremus. The coefficient of difference in body size between this metacercaria and P. heterotremus was 1.69, which was greater than a subspecific difference. Adults recovered from the lungs of a cat fed with the metacercariae were morphologically similar to, but smaller than, P. heterotremus dissected from the lungs of a feline experimental host. The tegumental spines of the worm in this study were singly spaced in arrangement, which is similar to, but larger than, the spines of P. heterotremus. Therefore, Paragonimus pseudoheterotremus is proposed as a new species.
肺吸虫属肺吸虫的鉴定基于后尾蚴和成虫的形态学。在泰国西部北碧府捕获的一只淡水蟹中发现了一种非常小的肺吸虫属后尾蚴，该地区此前未发现过异形吸虫的后尾蚴。后尾蚴囊肿直径为180 - 204微米，比异形吸虫的后尾蚴小。这种后尾蚴与异形吸虫在体型上的差异系数为1.69，大于亚种差异。从喂食了后尾蚴的猫肺中回收的成虫在形态上与从猫实验宿主肺中解剖出的异形吸虫相似，但更小。本研究中该虫体的体表棘呈单排排列，与异形吸虫的棘相似但更大。因此，拟将伪异形肺吸虫作为一个新物种。
