Three species of Planorbidae have been reported from Korea, e.g., Gyraulus convexiusculus, Hippeutis (Helicorbis) cantori, and Segmentina (Polypylis) hemisphaerula. Of these, only H. cantori was reported as the first and second intermediate host for Echinostoma cinetorchis, an important human intestinal parasite in Korea. Segmentina hemisphaerula has also been found to be an intermediate host. In field-collected planorbids, only S. hemisphaerula was found shedding echinostome cercariae and infected with metacercariae of E. cinetorchis, whereas no G. convexiusculus and H. cantori were found to be infected. In experiments with laboratory-bred snails, G. convexiusculus and S. hemisphaerula were susceptible to infection by miracidia of E. cinetorchis, but H. cantori could not be infected. Tadpoles of Rana nigromaculata and laboratory-bred snails of the 3 planorbid species were exposed to E. cinetorchis cercariae shed from field-collected S. hemisphaerula. All tadpoles, S. hemisphaerula, and G. convexiusculus became infected, but no H. cantori were infected. Metacercariae from tadpoles, S. hemisphaerula, and G. convexiusculus were fed to rats per os, and eggs of E. cinetorchis were detected in the rat feces 1 wk later. The rats were killed, and adult E. cinetorchis were recovered from the small intestines. This is the first report of G. convexiusculus as a potential first and second intermediate host and of S. hemisphaerula as a new first and second intermediate host for E. cinetorchis in Korea.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.