. Bulletins of American paleontology. VARIATION IN PREDATION BEHAVIOR OF OSTRACODE SPECIES ON SCHISTOSOMIASIS VECTOR SNAILS^ I. G. SoHN and L. S. Kornicker Geological Survey; Smithsonian Institution ABSTRACT Laboratory experiments using 1- to 3-day old Biomphalaria glabrata (Say, 1818) and species of ostracodes belonging to the genera Cypretta, Cypridopsis, Hctcrocypris, and Cypricercus indicate that the rate of of predation varies with the ostracode species used. RfiSUME Les experiences de laboratoire utilisant des Biomphalaria glabrata (Say, 1818) ages d'un a Trois jours et des especes
. Bulletins of American paleontology. VARIATION IN PREDATION BEHAVIOR OF OSTRACODE SPECIES ON SCHISTOSOMIASIS VECTOR SNAILS^ I. G. SoHN and L. S. Kornicker Geological Survey; Smithsonian Institution ABSTRACT Laboratory experiments using 1- to 3-day old Biomphalaria glabrata (Say, 1818) and species of ostracodes belonging to the genera Cypretta, Cypridopsis, Hctcrocypris, and Cypricercus indicate that the rate of of predation varies with the ostracode species used. RfiSUME Les experiences de laboratoire utilisant des Biomphalaria glabrata (Say, 1818) ages d'un a Trois jours et des especes d'ostracodes appartenant aux generes de Cypretta, de Cypridopsis, de Heterocypris et de Cypricercus indi- quent que la frequence de predation varie entre les especes d'ostracodes employees. INTRODUCTION The life cycle of the blood fluke that causes schistosomiasis (bilharziasis) in humans and other mammals is shown in Text-figure 1. Diseased animals excrete eggs, which develop in water into free-swimming miracidiae. These miracidiae enter the body of vector snails where they metamorphose into sporocysts which in turn produce many cercariae (free- swimming blood flukes) that leave the snail. After contact and penetration of the skin or hide of mammals, the cercariae invade certain organs where they multiply. Text-figure 1 suggests two stages during which the life cycle of the blood fluke may be interrupted: 1) The miracidiae may be eliminated through sanitary methods that prevent the eggs from developing in waters that contain the vector snail, and the development of worms in the infected animal may / ^ / / MAMMAL "- X. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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