Syn.: Distoma sinense, Cobbold, 1875; Distoma spathulatum, R. Leuckart, 1876 (nec Rudolphi, 1819); Distoma hepatis innocuum, Baelz, 1883.
In shape resembles Opisthorchis felineus, 13 to 19 mm. long, 3 to 4 mm. broad, at the beginning of sexual maturity 12 to 13 mm. long, 2·5 to 3 mm. broad. Oral sticker 0·58 to 0·62 mm., ventral sucker 0·45 to 0·49 mm. in transverse diameter. In the parenchyma numerous yellowish or brownish granules, especially behind the oral sucker and at the posterior end. Testicular branches very long, in the anterior testis often four, in the posterior testis five branches. Ovary generally with three large lobes and a smaller lobe. Vitellaria not always symmetrical, generally extending laterally from the ventral sucker to the ovary, interrupted in parts.
Eggs 26 µ to 30 µ by 15 µ to 17 µ. Average 29 µ by 16 µ.
Fig. 159.—Ova of Clonorchis sinensis. The knobs on the ends of the eggs are not shown. 900/1. (After Looss.)
This (?) species was discovered in 1874 by McConnell, in Calcutta, in the bile-ducts of a Chinaman who died shortly after being admitted into hospital.
Habitat.—Bile-ducts of man, dog and cat.
Distribution.—Especially in China, apparently rare in Japan.
Clonorchis endemicus, Baelz, 1883.