[A comparison of the superficial argentophilic structures of miracidia from 12 species of the genus Schistosoma]. / Comparaison des structures argyrophiles superficielles des miracidiums d'une douzaine d'espèces du genre Schistosoma.

ABSTRACT

Observation of miracidia of twelve species of Schistosoma shows the fundamental epidermal cell pattern is 6, 9, 4, 3. Comparison of superficial argentophilic organites permits us --to divide these species into three inequal groups mansoni group Schistosoma mansoni, S. rodhaini. haematobium group S. haematobium, S. bovis, S. indicum , S. intercalatum, S. margrebowiei , S. mattheei, S. nasale and S. spindale . japonicum group S. japonicum, S. incognitum . --to emphasize the relatively narrow specificity between members of each group and the snail-hosts. --to position the above species of Schistosoma within the Schistosomatoidea . Furthermore this character gives us some idea of the degree of evolution of species of Schistosoma.