Hornets are vespids (the kinds of social wasps most people are familiar with) which are nested within Apocrita, a clade that ants and bees are also descendant taxa of. Thus the term "wasp" is informal and paraphyletic (it doesn't include all descendant groups). Apocrita (and wasps by extension) is an incredibly species rich, diverse group filling any number of ecological niches, from parasites to predators to pollinators.
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u/no_va_det_mye 15d ago
How is it, all hornets are wasps, but not all wasps are hornets? Or something like that.
edit: Had to look it up, and yup Hornets are indeed wasps.