A distinctive feature of a ladybug from a beetle, ant, butterfly?

The ladybug is a beetle, and the ant is not a beetle and does not fly, a butterfly is also not a beetle. All the bugs are black, ugly, disgusting, nondescript, and the lady’s butterfly has a polka-dot coloring and it itself is red. And the name of the butterfly is very unusual – not the same as that of all other insects. Apparently, God liked this little bug very much. These butterflies also have another name “box butterflies”. We do not even perceive them as beetles, and so we perceive them as butterflies.