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Objective To determine the Lymnaea stagnalis snails' infection with trematodes larval stage in one of the springs of the Shahrekord city in Chahar Mahal and Bakhtiari. Methods To determine the snail infection to trematodes larval stages, the snails were caught from the field, and transferred to the Parasitology Department of Razi Vaccine and Serum Research Institute. Then stimulating of snails by light, tubing and squashing of them were used for detection and identification of the isolated cercariae. Results Of 400 collected snails from the referred springs, 350 of them identified as Lymnaea stagnalis. Observed cercariae were identified and classificated as order Plagiorchis, family Plagiorchiidae and genus Opisthioglyphe and Plagiorchis. Conclusions In Chahar Mahal and Bakhtiari Province, due to having more than 10% of water content of country, ecological conditions can play important role to develop sensitive snail especially Lymnaeidae and be considered as a critical and suitable habitat for them.

International audience; This study describes the ultrastructural organisation of the spermatozoon of a digenean Enodiotrema reductum (Pligiorchiida: Plagiorchiidae) from the green turtle Chelonia mydas (Linnaeus, 1758). This is the first report of E. reductum from Senegal. The mature spermatozoon of E. reductum is filiform and exhibits two axonemes of the 9 + "1" pattern of the Trepaxonemata, a nucleus, parallel cortical microtubules, an extramembranar ornamentation associated with spine-like bodies and granules of glycogen, among other ultrastructural features. The spermatozoon of E. reductum is distinguished by the presence of a moniliform mitochondrion composed of a bulge associated with a long cord and of a central cytoplasmic expansion. This work represents the first utrastructural study of any representative of the large family Plagiorchiidae. Our results are compared with previously published data on spermatozoa of other digenean taxa.

The trematode,Alloglossidium anomophagis sp. n. (Digenea: Plagiorchiidae) exhibits progenesis in water fleas of the genusDaphnia (Anomopoda: Daphniidae) occurring in temporary rainwater-filled ditches near Houston, Texas, USA. We assume thatA. anomophagis has achieved its truncated life cycle by eliminating the vertebrate which originally served as the definitive host. The adults ofA. anomophagis represent the smallest trematodes in the family Plagiorchiidae, measuring less than 0.5 mm in length.

In a critical review of the genus, the authors after studying ample material arrived at the conclusion that only four of the twenty-one species are valid. The shape of the testes is shown to vary from smooth to deeply lobed, and minor differences in the sucker ratios are considered invalid.