Non-reductional spermatozoa in three shell color types of the freshwater clam Corbicula fluminea in Taiwan

We found th ree distinct shell color types in samples of the freshwater cla m Corbicula fluminea Muller collected at Hou Don, Keelung, Taiwan. DNA micr ofluorometric analysis revealed that these three types consisted of both di ploids and triploids. DNA microfluorometry on sperm and somatic cells showe d that both diploid and triploid produced non-reductional spermatozoa. Thes e characteristics are similar to triploid C, leana Prime sampled in Japan. These findings suggest that Corbicula fluminea at different ploidy levels m ay be reproducing by androgenesis as already shown in C. leana from Japan.