Geodesic
Occurrence of polyspermy in planarians
Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 235-239

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

While carrying out cytological studies on two freshwater planarians, namely Dugesia benazzii (belonging to the «D. gonocephala group» and D. polychroa (belonging to the «D. lugubris-polychroa group»), the AA. observed that polyspermy may occasionally occur in them. Such an event appeared in natural polyploid populations showing peculiar genomic characteristics. It was never observed in natural diploid populations, whereas it occurred in diploid strains reared in laboratory as well as in strains obtained from interracial crosses. The AA. discuss the possible relationships between these different genotypic conditions and the appearance of polyspermy, on the basis of the concept that the eggs of planarians are, as a rule, monospermic, and that polyspermy is due to a block of the factors inhibiting supernumerary sperm penetration. 
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     author = {Benazzi Lentati, Giuseppina and Deri, Paolo},
     title = {Occurrence of polyspermy in planarians},
     journal = {Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali},
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     publisher = {mathdoc},
     volume = {Ser. 8, 83},
     number = {1},
     year = {1989},
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Benazzi Lentati, Giuseppina; Deri, Paolo. Occurrence of polyspermy in planarians. Atti della Accademia nazionale dei Lincei. Rendiconti della Classe di scienze fisiche, matematiche e naturali, Série 8, Tome 83 (1989) no. 1, pp. 235-239. http://geodesic.mathdoc.fr/item/RLINA_1989_8_83_1_a34/