Abstract
The chromosomes of the so-called rice water weevil,Lissorhoptrus oryzophilus, Kuschel obtained from Tokoname City, Aichi Prefecture, were studied in both oogonial and oocyte-maturation divisions in squash and sectioned slides, respectively. The chromosome number was confirmed as exactly 33 in both divisions. No reduction division takes place. It is therefore concluded thatLissorhoptrus oryzophilus is a parthenogenetic triploid in Tokoname City.
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