title: Redescription of Macroorchis spinulosus Ando, 1918 (Digenea: Nanophyetidae) encysted in the fresh water crayfish, Cambaroides similis.
abstract: 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.
authors.affiliation: Department of Parasitology, Institute of Endemic Diseases, Seoul National University College of Medicine, Korea. cjy@plaza.snu.ac.kr
authors.forename: J Y
authors.initials: JY
authors.lastname: Chai
authors.forename: W M
authors.initials: WM
authors.lastname: Sohn
authors.forename: S
authors.initials: S
authors.lastname: Huh
authors.forename: M H
authors.initials: MH
authors.lastname: Choi
authors.forename: S H
authors.initials: SH
authors.lastname: Lee
mesh_terms: D000818:Animals; D003400:Astacoidea / Q000469:parasitology*; D002415:Cats; D006801:Humans; D007814:Larva / Q000033:anatomy & histology; D051379:Mice; D008813:Mice, Inbred ICR; D051381:Rats; D017207:Rats, Sprague-Dawley; D014200:Trematoda / Q000033:anatomy & histology* / Q000302:isolation & purification; D014201:Trematode Infections / Q000469:parasitology