<紀要論文>
Embryogenesis in the Cattle Tick, Haemaphysalis longicornis

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概要 The aim of this paper is to describe the outline of embryonic development of the cattle tick, Haemuphysalis longicomis, with phase contrast and light microscopes. Since intralecithal nuclei were migra...ting towards the egg periplasm even immediately after oviposition, the process of intralecithal nuclear divisions was not recognizd, suggesting that the divisions have already finished when the egg is passing through the oviduct. The monocellular blastoderm was formed in the egg periplasm by the 3rd day. The future ventral side of a larva was characterized by the first appearance of the germ band in the blastoderm on the 4th day, and the polarity of the gnathosoma and idiosoma of the larva was determined by blastokinesis by the 7th day. In the tick, the 4th leg anlage appeared on the 7th day after oviposition. Accumulation of guanine in the rectal sac on the 8th day suggested completion of the digestive system and digestion of the yolk. The embryo developed into a pharate larva on the 12th day. Regression and retraction of the 4th leg anlage occurred by the time of full formation of the cuticle on the 14th day. The egg hatched out into a larva on the 17th day.続きを見る

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登録日 2012.08.01
更新日 2021.02.05

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