By electron-microscope cytochemistry, succinate- and NADH2-tetrazolium reductase activities have been demonstrated in spermatozoa of the pulmonate gastropods, Testacella and Helix. Enzyme reaction product is restricted to the mitochondrial compartment named the secondary helix; this compartment is derived from the matrix of typical mitochondria. ‘Mitochondrial metamorphosis’ during spermiogenesis accomplishes the segregation of dehydrogenases to this matrical compartment.

Cette publication fait partie d'une thèse de Doctorat d'État ès Sciences Naturelles devant être soutenue à la Faculté des Sciences d'Orsay. Boursier de l'American Cancer Society (PF. n° 342).