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Abnormal centriole duplication in insect male germ cells. (A) Detail of two procentrioles (arrows) in the primary spermatocytes of the butterfly Pieris. Procentrioles (arrows and insets) in young spermatids of the fruit fly Drosophila (B) and the ladybird Adalia (C) brackets outline the extension of the centrioles. (D) Multiple centrioles in the spermatids of the termite Mastotermes. Bars: A, insets B and C, 100 nm; B,C, 500 nm; D, 1 mm.
