Bivalves are known as fossils back to the Ordovician. In Norway, they are common fossils in Quaternary sediments. The scaphopods have a tube-shaped shell open at both ends. In the narrow end, water is led into the mantle cavity, where the gills are. They feed on small organisms which they trap with their tentacles and bring to the mouth, which possesses a rasping tongue.
Scaphopods are very common in the oceans today.
They live on soft, sandy bottoms, with the wide end of the shell buried. Scaphopods are known as fossils from the Ordovician till today. In Norway, they are common fossils in Quaternary sediments. Cephalopods are displayed in the ammonoid showcase , in the nautiloid showcase , and in the belemnite showcase . Internal structures in bivalves.