Fact sheets

What are the differences between bugs and beetles?

Bugs and beetles may sometimes look similar at first glance, but they belong to two quite different insect groups. Here are some features that can help distinguish between them.

Difference between bugs and beetles

Mouthparts

Bugs: mouthparts modified into piercing stylet (i.e. needle-like).
Beetles: chewing mouthparts.

Wings

Bugs: wings (if present) are membranous or partially thickened.
Beetles: forewings modified to form hard, leathery coverings called elytra, hindwings membranous and fold under elytra when not flying.

Diet

Bugs: liquid diet: mostly plant-feeders (nectar/sap), some feeders on animal fluids.
Beetles: wide range of plant and animal materials eaten.

Lifecycle

Bugs: incomplete metamorphosis - juveniles resemble adults except smaller and lack wings.
Beetles: complete metamorphosis - larvae with hardened head, chewing mouthparts and usually have legs.

Scientific classification

Bugs: Order Hemiptera
Beetles: Order Coleoptera