… The water passageway from the body surface to the gastric cavity, i.e., the water channel, can range from simple to complex, with the most complex being the asconoid type, the cycon type, and the leucon type. The asconoid type is found in individuals with a primitive, thin body wall. Cells with holes called porocytes penetrate the body wall and allow water to enter directly from the outside world. … *Some of the terminology that mentions "asconoid type" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
… 体表から胃腔へ通ずる水の通路,すなわち水溝の形式には簡単なものから複雑なものまであって,アスコン型,サイコン型,リューコン型(ロイコン型)の順に複雑になっている。アスコン型asconoid typeは原始的で薄い体壁をもつ個体に見られる。小孔細胞porocyteと呼ばれる穴のあいた細胞が体壁を貫通していて,外界から直接水を導入する。… ※「asconoid type」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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