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© Koninklijke Brill NV, Leiden, 2008 DOI: 10.1163/157075608X303618 Animal Biolog y 58 (2008) 1–11 www.brill.nl/ab Spermatogenesis chronology in Achroia grisella Fabricius (Lepidoptera, Pyralidae) comparing eupyrene and apyrene spermiogenesis Fernanda Fernandez-Winckler and Carminda da Cruz-Landim Departamento de Biologia, Instituto de Biociências, Universidade Estadual Paulista (UNESP), Av. 24A no 1515, CEP 13506-900 – Rio Claro, SP, Brazil e-mail: fcf@rc.unesp.br; cclandim@rc.unesp.br Abstract Achroia grisella exhibit dichotomous spermatogenesis producing two types of sperm, one is eupyrene that possesses nucleus, and the other is apyrene that lacks it. Transmission electron microscopy of sperma- togenesis morphology is described considering sperm type which will appear at some point during insect development, and differences that mark the two types of sperm formation. The differences between them are only really visible during spermiogenesis even though they were determined before meiosis. Both forms were seen in the larval stage, but there is a little difference in the time of their appearance. Eupyrene cysts were seen from the 8 th larval stage, whereas apyrene were only found after the 10 th stage. In early insect development stages, eupyrene cysts predominate, but as the insect ages, they are overtaken by apyrene. Although some eupyrene cysts are still present in young
Animal Biology – Brill
Published: Jan 1, 2008
Keywords: Morphology; sperm dichotomy; spermatogenic phases; ultrastructure; temporal differences
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