Karyotype delineation in Isidora truncata (Gastropoda: Planorbidae).

Metaphase chromosomes of a single Sardinian population of Isidora truncata were examined in an attempt to provide a picture of a standard karyotype to which Sardinian populations could be referred. Several new foci were identified and mapped.

[Radiosensitivity curve of different stages of spermatogenesis of Anopheles atroparvus (Diptera:Nematocera)]. / Curva di radiosensibilita' degli stadi della spermatogenesi di Anopheles atroparvus (Diptera: nematocera)

In order to obtain a dose-hatchability curve for irradiated spermatogenetic stages of Anopheles atroparvus, we have irradiated with the same dose "4500 r" young fourth larval stages, old fourth larval stages, nymphae and adult males. Those different stages represent different phases of spermatogenesis. The peak of radiosensitivity for embryonic mortality, was found in spermatids, lowest appeared in spermatogonies.