What are the two distinct biological categories primarily grouped under the culinary term "shellfish"?

Answer

Crustaceans and Mollusks

The general culinary and commercial term "shellfish" actually covers two biologically separate categories of aquatic invertebrates: Crustaceans and Mollusks. Crustaceans are arthropods, including animals like shrimp and crab. Mollusks belong to the phylum Mollusca and include bivalves, cephalopods, and gastropods. This biological separation is crucial because the specific allergenic proteins responsible for reactions are often unique to one group or the other, explaining why an allergy might not be universal across all items labeled as shellfish.

What are the two distinct biological categories primarily grouped under the culinary term "shellfish"?
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