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Korean J Parasitol > Volume 34(1):1996 > Article

Original Article
Korean J Parasitol. 1996 Mar;34(1):1-6. English.
Published online Mar 20, 1996.  http://dx.doi.org/10.3347/kjp.1996.34.1.1
Copyright © 1996 by The Korean Society for Parasitology
Redescription of Macroorchis spinulosus Ando, 1918 (Digenea: Nanophyetidae) encysted in the fresh water crayfish, Cambaroides similis
Jong-Yil Chai,*1Woon-Mok Sohn,2Sun Huh,3Min-Ho Choi,1 and Soon-Hyung Lee1
1Department of Parasitology, Institute of Endemic Diseases, Seoul National University College of Medicine, Seoul 110-799, Korea.
2Department of Parasitology, College of Medicine, Inje University, Pusan 614-735, Korea.
3Department of Parasitology, College of Medicine, Hallym University, Chunchon 220-702, Korea.

*Corresponding author (Email: cjy@plaza.snu.ac.kr)
Received September 01, 1996; Accepted February 01, 1996.


Macroorchis spinulosus Ando, 1918 (Digenea: Nanophyetidae) is redescribed based on adult flukes recovered from experimental mice, rats and cats which were fed with metacercariae encysted in the muscle of the crayfish. Cambaroides similis. A total of 117 adult flukes were harvested from the small intestine of the experimental animals at 5-21 days post-infection. The worm recovery rate was 31-37%, not significantly different among the three kinds of animals. The metacercariae were round, 0.18 mm in average diameter, encysted with two layers of thick walls, and possessing a stylet on the oral sucker and Y-shaped excretory bladder. The adult flukes were oval, 0.66-0.71 mm long and 0.36-0.41 mm wide, and characterized by the presence of a stylet on the oral sucker, variable location of the ovary near the mid- portion of the body, bilobed seminal vesicle, and anterolateral location of two testes. These morphological features were a little different from the original description, hence, an emended version of M. spinulosus was given. M. spinulosus is a new intestinal trematode of animals and possibly man in Korea.


Fig. 1
Macroorchis spinulosus, drawing of an adult fluke recovered from an experimental rat 5 days after infection. St, stylet; OS, oral sucker, VS, ventral sucker; GP, genital pore; T, testis; Ov, ovary; SV, seminal vesicle; Vt, vitellaria.

Figs. 2-4
Fig. 2. The fresh specimen of M. spinulosus drawn in Fig. 1, ventral view. Note the bilobed seminal vesicle in the mid-portion of the body. Fig. 3. The oral sucker showing a stylet (arrow) on its upper lip. Fig. 4. Uterine eggs, immature, in a full-grown adult fluke.

Fig. 5
A mid-sagittal section of an adult M. spinulosus, showing the characteristically bilobed seminal vesicle (arrows).

Fig. 6
A metacercariae of M. spinulosus, isolated from a crayfish, C. similis. Note a prominent stylet on the oral sucker and two thick cyst walls (arrows).


Table 1
Results of worm recoverya) from three kinds of animals infected with metacercariae of M. spinulosus isolated from the crayfish

Table 2
Presence of a style on the oral sucker and variable position of the ovary in the present specimens, M. spinulosus

1. Ando A. Tokyo Iji Shinshi 1918;2079:1–6.
2. Ando A. Nippon Biseibutsu Gakkai Zasshi 1921;15:813–826.
3. Choi DW. Paragonimus and paragonimiasis in Korea. Korean J Parasitol 1990;28 Suppl:79–102.
4. Machida M, et al. Memo Nat Sci Museum 1982;15:149–154.
5. Saito Y, et al. Acta Med Biol 1982;30:47–56.
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