This article reports a new species of Cyathocotyle appeared in the pasture duck's caecum in Fujian. Features of this ovoid fluke, which was 1. 175-2. 375 mm× 0. 950-1. 875 mm in size, included an obvious oral sucker and pharynx with one large holdfast, two testes varying in shape, few eggs, and one near-round ovary and long, bag-shaped cirrus pouch in the back of the fluke mainly in the caecum of some domestic ducks. Compared with similar Cyathocotyles, this fluke had distinguished characteristics, thus named Cyathocotyle caecumalis sp. nov. The epidemiology, clinical symptoms and pathological changes are briefly described with regards to the possible disease caused by Cyathocotyle caecumalis sp. nov.%简要报告了福建省寄生在放牧家鸭盲肠内杯叶吸虫属一新种.该吸虫体呈卵圆形,大小为1.175～2.375 mm×0.950～1.875 mm;口吸盘和咽明显,并有1个很大的粘附器;睾丸2个,其形态呈现多样化;卵巢为类圆形;雄茎囊呈长袋状,位于虫体的后方;虫卵少.该吸虫与近似的杯叶吸虫相比,有着显著的差异,为此立一新种,定名为盲肠杯叶吸虫.同时对由该吸虫引起的鸭盲肠肿大坏死症病的流行病学、临床症状、病理变化等进行初步观察.
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