In the case of Lymnaea peregra, studies indicate that a dextral gene is expressed during egg formation.

在锥实螺的例子中，研究表明右旋基因是在卵的形成期表达的。

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In the case of Lymnaea peregra, studies indicate that a dextral gene is expressed during egg formation;

在锥实螺的例子中，研究表明右旋基因是在卵的形成期表达的；

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However there is one species of pond snail, Lymnaea stagnalis, which demonstrates examples of both clockwise or anticlockwise spiralling shells.

然而，有一种叫做“静水椎实螺”的田螺，它是同时拥有顺时针和逆时针螺壳的典型代表。

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However there is one species of pond snail, Lymnaea stagnalis, which demonstrates examples of both clockwise or anticlockwise spiralling shells.

然而，有一种叫做“静水椎实螺”的田螺，它是同时拥有顺时针和逆时针螺壳的典型代表。

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