backswimmer
/ˈbækˈswɪmə(r)/noun
1- a predatory aquatic bug that swims on its back using its long back legs as oars. It is able to capture large prey such as tadpoles and fish.仰泳蝽, 松藻虫。参见WATER BOATMAN.
1.1
- Family Notonectidae, suborder Heteroptera: Notonecta and other genera.仰泳蝽科, 异翅亚目, 仰泳蝽等属。