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Metagonimus miyatai sp. nov. (Digenea: Heterophyidae), a new intestinal trematode transmitted by freshwater fishes in Japan and Korea
S Saito,1J Y Chai,*2K H Kim,3S H Lee,2 and H J Rim4
1Department of Immunology and Parasitology, Yamagata University School of Medicine, Yamagata City 990-23, Japan.
Received November 07, 1997; Accepted November 26, 1997.
Abstract
Metagonimus miyatai n. sp. (Digenea: Heterophyidae) is described based on adult flukes collected from experimental dogs and hamsters fed with metacercariae encysted in the sweetfish, Plecoglossus altivelis, dace, Tribolodon hakonensis and T. taczanowskii, common fat-minnow, Morocco steindachneri, pale chub, Zacco platypus, and dark chub. Zacco temmincki, and on those collected from naturally infected humans. The new species was morphologically compared with M. yokogawai and M. takahashii obtained from experimental animals fed with the sweetfish and the crucian carp, Carassius carassius, respectively. The uterine loops of M. miyatai reached near the posterior end of the body through the space between the two testes, whereas those of M. yokogawai, occupied only the space between the acetabulum and anterior border of two testes. This uterine tubule distribution was similar to that of another closely related species, M. takahashii. However, vitellaria of M. miyatai ended in front of the posterior end of the left testis, while those of M. takahashii reached the posterior end of the left testis and ran it over. By raising M. miyatai as a new species, differentiation of M. yokogawai and M. takahashii became very clear. A key to the species of the genus Metagonimus in the Far East has been proposed.
Figures
Figs. 1-10 Figs. 1-3. Adults of M. miyatai n. sp. from dogs about two weeks post-feeding of metacercariae. Fig. 1. A holotype originating from the scale of P. altivelis in the Oguni River, Funagata Town, Yamagata Prefecture. Fig. 2. A paratype from Z. temmincki caught in the Ohta River, Hiroshima City. Fig. 3. A paratype from M. steindachneri from the Daimon River, Yamagata city. Fig. 4. An adult of M. yokogawai from a dog 16 days post-feeding of metacercariae encysted in the muscle of P. altivelis from the Ohta River. Fig. 5. An adult of M. takahashii from a dog 13 days post-feeding of the metacercariae encysted under the scale of Z. temmincki from the Ohta River. Fig. 6. Metacercariae of M. yokogawai from P. altivelis. Fig. 7. Metacercariae of M. miyatai from M. steindachneri. Fig. 8. Metacercariae of M. takahashii from C. carassius. Fig. 9. Posterior part of an excysted metacercaria of M. miyatai. C, caecum; L, Laurer's canal; R, seminal receptacle; T, testis; U, uterus. Fig. 10. An excysted metacercria of M. yokogawai stained with PAS(dorsal view). Bar indicates 500 µm.
Tables
Table 1 Comparative measurementsa) of the adults of three species of the genus Metagonimus from experimental dogs and hamsters
Table 2 Comparative measurementsa) of the eggs of three species of the genus Metagonimus from the feces of experimentally infected dogs and hamsters
Table 3 Comparative measurementsa) of the metacercariae of three species of the genus Metagonimus
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