Water r beetle龙虱
water-beetle larva龙虱幼虫
water chestnut beetle菱角叶甲;菱角萤叶甲
giant water beetle巨型水甲虫
buy water beetle台湾买家
true water beetle或真水生甲虫
Crawling Water Beetle沼梭甲科
N（名词） any of various beetles of the families Dysticidae, Hydrophilidae, etc, that live most of the time in freshwater ponds, rivers, etc 水甲→see whirligig beetle