Cocoon deposition and hatching in the aquatic leech, Theromyzon tessulatum (Annelida, Hirudinea, Glossiphoniidae)
Cocoon deposition and hatching in the aquatic leech, Theromyzon tessulatum (Annelida, Hirudinea, Glossiphoniidae)
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DOI：
10.1674/0003-0031(2005)154
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发表时间：
2005-07-01
影响因子：
0.6
通讯作者：
Shain, DH
中科院分区：
文献类型：
--
作者：
Mason, TA;Sayers, CW;Shain, DH
水蛭的茧，Theromyzon tessulatum，是水下分泌和密封的两个盖（塞）是不对称的位置上的茧膜的上面。这些茧膜是以蛋白质为基础的，但它们的氨基酸组成似乎与周围的茧膜不同。由亲水蛭沉积在茧内的液体含有几种蛋白质，其大小范围从类似于40-100 kDa，其中大多数具有低于6.8的pI。而在茧内，晚期胚胎显示蠕动收缩，这可能有助于减弱的鳃盖/膜边界。幼虫在2-3周后冲破鳃盖，并在几个小时内离开茧。茧膜上表面上的不对称位置的鳃盖可以促进育雏亲水蛭和新兴的年轻人之间的接触，附着在父母的腹部，并带来了他们的第一次血餐。
Cocoons of the leech, Theromyzon tessulatum, are secreted underwater and sealed by two opercula (plugs) that are asymmetrically positioned on the upper aspect of the cocoon membrane. The opercula are protein-based, but their amino acid composition appears to differ from the surrounding cocoon membrane. Fluid deposited inside the cocoon by the parent leech contains several proteins ranging in size from similar to 40-100 kDa, most of which have pI's below 6.8. While inside the cocoon, late stage embryos display peristaltic contractions that may contribute to weakening of the opercula/membrane boundary. juveniles break through the opercula after 2-3 wk and exit the cocoon over the course of several hours. The asymmetrical position of the opercula on the upper surface of the cocoon membrane may facilitate contact between the brooding parent leech and the emerging young, which attach to the venter of the parent and are brought to their first blood meal.