THE EARLY DEVELOPMENT OF THE SNAIL BIOMPHALARIA GLABRATA (SAY) AND THE ORIGIN OF THE HEAD ORGANS by TOSHIE CAMEY* and N. H. VERDONK** (Zoological Laboratory, University of Utrecht, The Netherlands & "René Rachou" Research Centre, National Istitute of Rural Diseases, Belo Horizonte, M. B., Brazil) * Instituto Nacional de Endemias rurais, Centro de Pesquisas "Ren6 Rachou", Av. Augusto de Lima 1715 (Caixa Postal 1743), Belo Horizonte, M.G., Brazil. ** Zoologisch Laboratorium der Rijksuniversiteit, Janskerkhof 3, Utrecht, The Netherlands. 94 I. INTRODUCTION Biomphalaria glabrata (Say, 1835) a fresh water pulmonate generally found in brooks, trenches, irrigation- and drainage canals, has been reported from 14 Brazilian states (COELHO, 1959). This mollusc be- came subject of many investigations since it was identified as the intermediate host of Schistosoma mansoni Sambon, a parasite infecting more than 8 million persons in Brazil. It has been studied in the field of taxonomy, morphology, cytology, physiology, ecology, genetics, and reproduction. In order to find methods to suppress this snail, a number of experiments have been carried out, for which egg masses at various stages of embryonic development were used. However, a more ex- tensive study of normal development has never been made, although this is
Netherlands Journal of Zoology (in 2003 continued as Animal Biology) – Brill
Published: Jan 1, 1969
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