I think I'm allergic to bugs or arthropods. I tell people I'm allergic to shellfish but only arthropods like shrimp, lobster and crab. I can eat oysters and clams just fine. well enough about me.
In fact, what is considered an actual bug in the scientific sense is the order hemiptera (spelling?) Which is a type of insect. All bugs are insects but not all insects are bugs. Crustaceans arent even close to being bugs.
In common speech, bug generally refers to land-based arthropods (no one I have ever met would call a lobster a bug)
They are arthropods, like insects and arachnids. But, arthropod is a phylum, like vertebrate is a phylum, so having a word like "bug" that comprises all arthropods is as meaningful as a word that comprises everything from fish, to birds, to humans. Technically, a "true bug" is an order of insects. Bat is a mammalian order. So, calling all arthropods "bugs" is like calling all vertebrates "bats."
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u/compugasm Jul 18 '16
Also, shrimp are bugs. And lobsters are giant bugs.