The Japanese Journal of Genetics
A triploid race of the parthenogenetic Japanese weevil Blosyrus japonicus Sharp
Coleoptera: Curculionidae
Yasushi TAKENOUCHI
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Volume 58 (1983) Issue 6 Pages 617-620

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Abstract

The chromosomes of the weevil, Blosyrus japonicus Sharp, have been investigated in Hokkaido. A triploid parthenogenetic race (3x=33) was found in Ishiyama-rikkyo, Sapporo. The species is now known to have four parthenogenetic races, 3x, 4x, 5x, 6x, as well as a diploid bisexual race. All these races have been found in Japan. This represents the highest number of different polyploid races observed in any parthenogenetic weevil.

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