As time goes on it seems that the concept of a pokémon's "type" gets more and more vague, and trends associated with certain types are being broken in recent gens.

For example, now normal gets regularly paired with types other than flying, non-legendary pure flying types are a thing, ghost types don't need to be actual ghosts, dragon types don't need to look like traditional dragons, etc.

So how long until they start introducing bug types that are not based on actual bugs/invertebrates in general?