1. Predaceous aquatic insect that swims on its back and may inflict painful bites
   - backswimmer

Type of: bug, hemipteran, hemipteron, hemipterous insect

Part of: genus Notonecta, Notonecta

• western omelet
• Western paper birch
• Western pasqueflower
• western pipistrel
• western poison oak
• western poppy
• western prince's pine
• western ragweed
• Western rattlesnake
• western red cedar
• western red-backed salamander
• western redbud
• Western ribbon snake
• Western Roman Empire
• Western saddle
• Western Sahara
• Western Samoa
• Western Samoan monetary unit
• Western sand cherry
• western sandwich
• western saxifrage
• Western silvery aster
• western skink
• western spadefoot
• western tamarack