A style, sometimes referred to as a crystalline style (though there are no other biological kinds), is a rod made of glycoprotein located in the midgut of most bivalves and some gastropods which aids in extracellular digestion. It consists of a protein matrix coated with digestive enzymes secreted by the style sac in the animal's stomach. When feeding, its projecting end is scraped against the stomach wall and abraded, thus releasing the enzymes.
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- Hameed, P. Shahul (1987). "In vivo dissolution and reformation of crystalline style in certain intertidal bivalve molluscs". Mahasagar bulletin of the national institute of oceanography. 20 (2): 135–138.