其中包括现生属萝卜螺(Radix)、圆扁卷螺(Hippeutis)及近于现生属椎实螺(Lymnaea) 的小隐螺(Adelinella)、似天鹅绒螺(Velutinopsis)的种类。
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Lymnaea stagnalis 静水椎实螺
Lymnaea auricularia 胞蚴和尾蚴在萝卜螺
lymnaea swinhoei 斯温和氏椎实螺
lymnaea ovata 卵圆萝卜螺
Lymnaea hookeri 霍氏椎实螺
Lymnaea pervia 有孔椎突螺
lymnaea cubensis 古巴椎实螺
lymnaea plicatula 折叠锥实螺
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。
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;
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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