任一种热带树栖螺属蜗牛，壳上有多种颜色，形状如泪珠。
Any of various tropical snails of the genus Liguus, having a colorful shell in the shape of a teardrop.
这些色彩斑斓的生物属紫螺科，足部产生的气泡可产生使它们浮在水面的浮力。
The colourful creatures, who are members of the Janthinidae family, stay alive by attaching their feet to the bubbles they carry to give them buoyancy.
目的探讨短沟蜷属螺类生化特性和种间差异，以及对传播卫氏并殖吸虫病的意义。
Objective To understand the biochemical characters of the intra-species of Semisulcospira and importance of paragonimiasis transmission.
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