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- Title
Process of egg formation in the female body cavity and fertilizationin male eggs of Phytoseiulus persimilis (acari: phytoseiidae)
- Authors
Nagahama, Yoshitaka; Amano, Hiroshi; Toyoshima, Shingo; Nakamura, Masaru
- 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 wasdeposited. In the meantime some ova began to expand sequentially andtwo 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.
- Subjects
ACAROLOGY; FERTILIZATION (Biology); MITES; PHYSIOLOGY; PHYTOSEIIDAE
- Publication
Experimental & Applied Acarology, 1999, Vol 23, Issue 5, p441
- ISSN
0168-8162
- Publication type
Article