垂唇 oral cone， peristome

互联网2013-11-14

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　　亦称口丘、围口部。系有刺胞动物水螅型在口盘中央包围开口的部分，呈锥形隆起。其表层（外胚层）的刺细胞显著多于水螅体的其他部分，生活时大多呈现白色。由于上皮肌细胞很发达，所以摄食时伸缩自如，垂唇显著突出的部分称为吻（ probosc-is）。

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