浮游软体动物是指海洋中各种终生营浮游生活的腹足类(Gastropoda)，主要包括后鳃亚纲中的翼足类（Pteropoda）和前鳃亚纲的异足类(Heteropoda)及海蜗牛科(Janthiniidae)的种类。
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Insecta and Gastropoda are absolutely dominant ecological groups,which are 37 species and 16 species respectively. Five species belong to Oligochaeta,3 species to Crustacea,2 species to Hirudinea,only 1 species belongs to Lamellibranchia.
昆虫纲和腹足纲为绝对优势类群,分别为37种和16种;寡毛纲5种,甲壳纲动物3种,蛭纲2种,瓣鳃纲只1种。
参考来源 - 扎龙湿地春季大型底栖动物群落结构与水质生物评价·2,447,543篇论文数据，部分数据来源于NoteExpress
Any of numerous aquatic or terrestrial mollusks of the class Gastropoda, typically having a spirally coiled shell, broad retractile foot, and distinct head.
蜗牛：腹足科众多水生或陆栖软体动物中的一种，通常带有一螺旋似的厚壳，足宽且向内旋，脑袋清晰。
Few species, low biomass and lack of blue green algae, Gastropoda, Lamellibranchia and Crustacea are most notable characteristics distinguished from general neutral and alkaline lakes.
湖泊生物种群少且生物量低，缺失蓝藻和腹足类、瓣鳃类、甲壳类动物等为其区别于一般中、碱性湖泊最显著的特点。
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