Studies on the fresh water cercariae in Leyte Island, Philippines. 5. Cercariae from Planorbidae.

In the previous papers of this series, the cercariae from Oncomelania quadrasi (Part 2), from Thiaridae (Part 3), and from Viviparidae and Pilidae (Part 4) were reported continuously. The present paper deals with the cercariae from Planorbidae. These studies were all carried on during the period of 1975 and 1976 in Leyte Island, Philippines. The number of snails examined were, 2,214 Segmentina hemisphaerula, 837 Gyraulus convexiusculus, and 279 Indoplanorbis exustus. From the former two species of snails, eight species of cercariae were detected, but no cercaria was found from Indoplanorbis exustus. The eight species of cercariae comprise 3 furcocercous cercariae, 2 amphistome cercariae, one echinostome cercaria and 2 xiphidiocercariae. These are described and illustrated with a tentative name from Cercaria leyteensis no. 29 to Cercaria leyteensis no. 36, in addition with some remarks on their presumptive life histories.