It is used in different ways, and not all of them are accurate. True bugs are a type of insect that has a straw-shaped mouth and segmented antennae, like stink bugs and bedbugs. On the other hand, ...

But unlike other arthropods—like lobsters, spiders, or millipedes—insects have three pairs of jointed legs, segmented bodies, an exoskeleton, one pair of antennae, and (usually) one or two ...

To explore how insects might have evolved to detect these scent cues, the researchers examined the size of the antennae – the primary olfactory organs – in 582 specimens across 94 Lepidoptera species.