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広島大学大学院教育学研究科紀要. 第二部, 文化教育開発関連領域 Issue 57
published_at 2008-12-26
ハスノハカシパン(棘皮動物門: ウニ綱: タコノマクラ目)初期発生の教材化に関する研究
Early Development of the Sand Dollar, Scaphechinus mirabilis (Echinodermata: Echinoidea: Clypeasteroida) as a Teaching Material
Torigoe Kenji
Abstract
Scaphechinus mirabilis Agassiz, 1863 is a widely distributed sand dollar in Japan. We observed early development of this species based on the specimens from Etajima Island, Hiroshima Prefecture. Our study revealed that S. mirabilis is a good teaching material for observing early development by the following features: the jelly coat with reddish-purple pigment spots, showing to enable the observation of the jelly coat without Indian ink; the fertilization membrane is clearly observed; and the blastomeres separate clearly, showing the observation of the cleavage is easy.
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Keywords
Scaphechinus mirabilis
Echinodermata
early development
teaching material
ハスノハカシパン
棘皮動物
初期発生
教材
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