The chromosomes of 24 Japanese weevils were reinvestigated in the male germ line using squash preparations. The results are summarized in Table 1. All species have an Xyp sex-determining mechanism.
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Takenouchi, Y. A revised study of the chromosomes of twenty-four species of Japanese weevils (Coleoptera: Curculionidae). Genetica 44, 621–632 (1973). https://doi.org/10.1007/BF00116817
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DOI: https://doi.org/10.1007/BF00116817