Crabs, lobsters, cockroaches, and dust mites are all of the phylum arthropoda and it's suspected that that connection is why, seemingly, people who have an allergic reaction to dust mites are more likely to have an allergic reaction to crustaceans, as well. (I'm sorry. I don't have a source other than "my wife has 14 known food allergies" or "trust me, bro", and I really don't want to look one up lol)

So, if you want to get technical/assholish: all that would have to be switched would be changed in order to clear up any semantic issues is arthropods/insects.