Koda on limustel esinev lubjast moodustunud eksoskelett. (Peale organismi surma järele jäänud koda nimetatakse ka teokarbiks[viide?]).
Koda on olemas enamikul limustel (nii tigudel kui karpidel), puududes nälkjatel. Koda moodustub lubjast, kasvades limuse mantli epidermist eraldunud ensüümide kaasabil.
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