头丝 cephalic filament，captacula

互联网2013-11-14

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　　软体动物掘足类，如角贝等，在头部左右小形的叶状部（触手叶 tentacular lobe）的边缘着生很多细丝状结构，称之为头丝。被覆以纤毛上皮，末端膨大呈棒状，侧面有凹陷。向各个方向展开。一般认为是感觉器官，兼有捕食之功能。自切性强，可再生。

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