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The animals selected for the endoparasitic observation are four species of carnivorous mammals specifically, Asiatic lion (Panthera leo persica), Bengal tiger (Panthera tigris tigris), Indian leopard (Panthera pardus fusca) and Indian jackal (Canis aureus indicus) that have been captivated in Thrissur zoo. By using direct smear inspection, conventional sedimentation, and flotation procedures, the faecal samples were subjected to a thorough routine parasitological study to determine the presence of parasite eggs and oocysts. The current analysis revealed that helminth and protozoan parasites infest four species of carnivorous mammals. Ancylostoma, Toxascaris leonina, Toxocara, Strongyle type and the trematode eggs of the species of Paragonimus as well as the coccidian genera Isospora of protozoa, were all observed to be abundant in the gastro intestinal tract of chosen mammals as a result of the study. By statistical analysis, according to the most recent observations it is noticed thatToxocara makes upon 25% of wild mammals, and any of the parasites infects 60% of wild mammals.

Three new species of Xiphidiocercous cercariae, Cercaria sp. IX Malabar n.sp., Cercaria sp. X Malabar n.sp. and Cercaria sp. XI Malabar n.sp. were recovered from the thiarid snail Thiara tuberculata collected from freshwater bodies in the Palakkad district of Kerala. The three new species are described in detail and compared with their related species to establish their systematic position.

The life-cycle stages ofPleurogenoides malampuzhensissp. nov. infecting the Indian bullfrogHoplobatrachus tigerinus(Daudin) and the skipper frogEuphlyctiscyanophlyctis(Schneider) occurring in irrigation canals and paddy fields in Malampuzha, which forms part of the district of Palakkad, Kerala, are described. The species is described, its systematic position discussed and compared with the related species,P. gastroporus(Luhe, 1901) andP. orientalis(Srivastava, 1934). The life-cycle stages, from cercaria to egg-producing adult, were successfully established in the laboratory. Virgulate xiphidiocercariae emerged from the snailDigoniostoma pulchella(Benson). Metacercariae are found in muscle tissues of dragonfly nymphs and become infective to the frogs within 22 days. The pre-patent period is 20 days. Growth and development of both metacercariae and adults are described.

The life-cycle stages of a new species of Uvulifer, U. iruvettiensis sp. nov. infecting the white-throated kingfisher Halcyon smyrnensis (Linnaeus) in Kerala, India are described. The new species is described in detail, and compared with its related species. The furcocercous cercariae emerged from the planorbid snail Indoplanorbis exustus (Deshayes). Metacercariae were found below the skin of tadpoles of Euphlyctis cyanophlyctis (Schneider). H. smyrnensis became infected when fed on tadpoles containing infective metacercariae. Pre-patent period is 10 days. Successive stages in the development of metacercariae and adults were followed in the laboratory.