背触角dorsal papilla

互联网2013-11-14

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　　位于腹足纲拟蓑海牛类身体背面外套膜的突起，呈细长的纺锤形，按一定顺序排列。内有与肠相连之肝盲囊（ hepatic caecum）。还有以细管与其相连的刺丝囊。背触角的表面用作皮肤呼吸（二次性的鳃）。此外，据谓外界的水可自顶部小孔出入于背触角，而以类似直肠呼吸的方法进行呼吸。背触角易自切。

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