Mating behaviour of Echinostoma trivolvis and E. paraensei in concurrent infections in hamsters.

Young adults of Echinostoma trivolvis and E. paraensei were recovered from hamsters previously infected with metacercarial cysts. Some worms of each species were exposed for 1 h to 3-H-tyrosine to label sperm and transplanted singly to uninfected hamsters with several unlabelled worms of the same or opposite species or both species.

Life history and identification of Philophthalmus lucipetus from Israel.

A Philophthalmus species whose larval stages have been isolated from Melanopsis praemorsa snails collected in Israel and formerly identified as probably belonging to Philophthalmus palpebrarum has now been reevaluated as belonging to Philophthalmus lucipetus. The present determination is based on a detailed study of all the stages of the parasite's life cycle--eggs, intramolluscan stages, cercariae, and adults. They were compared to the original species P.

The effects of salinity, pH and temperature on the half-life and longevity of Echinostoma caproni miracidia.

Miracidia of Echinostoma caproni were exposed to solutions varying in salinity, pH, and temperature in 1 ml concavity slides. Half-lives of the miracidial populations were determined and longevity curves constructed to find maximum life spans of the miracidia in the different conditions. Control miracidia in aquarium water at pH 7.

Mating behaviour of Echinostoma caproni and E. trivolvis in concurrent infections in hamsters.

Young adults of Echinostoma caproni and E. trivolvis were recovered from hamsters. Some worms of each species were exposed to [3H]tyrosine for 1 h to label sperm, and these were transplanted singly to uninfected hamsters with various combinations of unexposed worms of either the opposite species or both species.

The effects of light intensity on hatching of Echinostoma caproni Miracidia.

Egg cultures of Echinostoma caproni were exposed to 25-W incandescent light at control intensities (9.7 mumol s-1 m-2) and reduced intensities (1.0, 0.