虫

tardigrade; water bear

useful insect

caterpillar fungus (esp. Cordyceps sinensis)

protection from insects; insect repellence

inchworm; measuring worm; looper (caterpillar)

insectivore

protozoan

cannot contain one's anger; can't contain myself; staying angry

stag beetle

Insecta; the insects

Proverb

some prefer nettles; there's no accounting for taste; every man to his taste

roundworm (Ascaris lumbricoides); mawworm; intestinal worm

(insect) pest; insect carrying disease germs; insect causing damage to crops

pillbug; pill bug; woodlouse; sowbug; sow bug; slater

entomologist

summer insect; summer insects

Word usually written using kana alone

scarabaeid beetle

Mimela splendens (metallic-green scarabaeid beetle)

Work of art, literature, music, etc. name

The Gold-Bug (short story by Edgar Allan Poe, 1843)

trilobite

entomophagy; insect eating

bur (prickly seeds or seedheads that stick to fur and clothes); burr

flies that appear in Tohoku and Hokkaido in late autumn or early winter (esp. the woolly apple aphid)

flies that appear above fallen snow in the early spring (esp. certain species of small winter stonefly and true crane fly)

wharf roach (species of isopod closely related to the sea slater; Ligia exotica)

Proverb

tread on a worm and it will turn; even a tiny bug will defend itself; even the weakest and smallest beings have their own wills, so do not make light of them