Bivalve anatomy

thumb|A mussel (genus Mytilus (bivalve)|Mytilus), attached to a rock by its byssus thumb|Illustration of the byssus of Dreissena polymorpha, the freshwater zebra mussel A byssus () is a bundle of filaments secreted by many species of bivalve mollusc that function to attach the mollusc to a solid surface. Species from several families of clams have a byssus, including pen shells (Pinnidae), true mussels (Mytilidae), and Dreissenidae.

thumb|9 day old veliger of the nudibranch Tritonia diomedea with various organs and structures labeled. Larval size about 200 um on its long axis. thumb|Veliger of sea hare [[Dolabrifera dolabrifera, with two rows of cilia visible]]

anatomical structure which is part of the body of some aquatic molluscs

respiratory organ or gill which is found in many mollusks

anatomical term applied to the shell of molluscs

seashell

highest part of each valve of the shell of a bivalve or univalve mollusk