We tend to use the word bug loosely for any very small creature with legs. … Bugs are a type of insect, which belong to the class Insecta, and they are characterized by three-part bodies, usually two pairs of wings, and three pairs of legs, (e.g., bees and mosquitoes).

What is a bug but not an insect?

Other common insects that do not qualify as bugs include moths, butterflies, and bees. … MIllipedes, earthworms, and spiders, for example, do not possess the six legs and body segment structures found in insects, and are instead members of different animal orders—spiders are arachnids, while millipedes are myriapods.

Is Butterfly a bug?

The wing becomes thin and transparent toward the end. Aphids, cicadas, stink bugs, bed bugs, and water bugs are part of Hemiptera and are actually bugs. However, beetles, butterflies, bees, and flies are all just insects. … Spiders are arachnids since they have eight legs, two body parts, and no wings or antennae.