Process of Egg Formation in the Female Body Cavity and Fertilization in Male Eggs of Phytoseiulus Persimilis (Acari: Phytoseiidae) |
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Authors: | Shingo Toyoshima Masaru Nakamura Yoshitaka Nagahama Hiroshi Amano |
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Institution: | (1) Laboratory of Applied Entomology and Zoology, Faculty of Horticulture, Chiba University, Matsudo, Chiba, 271-8510, Japan;(2) Present address: National Institute of Fruit Tree Science, Ministry of Agriculture, Forestry and Fishery, Apple Research Center, Shimokuriyagawa, Morioka, Iwate, 020-0123, Japan;(3) Faculty of Medicine, Teikyo University, Hachioji, Tokyo, 192-0395, Japan;(4) National Institute for Basic Biology, Okazaki, Aichi, 444-8585, Japan;(5) Laboratory of Applied Entomology and Zoology, Faculty of Horticulture, Chiba University, Matsudo, Chiba, 271-8510, Japan |
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Abstract: | The process of egg formation in the body cavity of a phytoseiid mite, Phytoseiulus persimilis, was observed to examine fertilization of male eggs. After insemination, one of the ova at the periphery of the ovary began to expand, taking up yolk. Two pronuclei appeared in the expanded egg, located dorsally in the ovary, and yolk granules were formed gradually. After the egg became filled with yolk granules the two pronuclei fused. The egg moved via the narrow entrance at the ventral region into the oviduct, where the eggshell was formed. When the eggshell was complete, and while embryogenesis proceeded, the egg was deposited. In the meantime some ova began to expand sequentially and two joining pronuclei appeared in expanding eggs. The joining pronuclei in the first egg proved male diploidy. This is additional evidence of pseudo-arrhenotoky in this phytoseiid mite species, since the first eggs developed into males. |
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Keywords: | pseudo-arrhenotoky Phytoseiulus persimilis fertilization egg formation male diploidy |
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