Bouchet & Rocroi (2005): Domain: Eukaryota • Regnum: Animalia • Subregnum: Eumetazoa • Cladus: Bilateria • Superphylum: Protostomia • Phylum: Mollusca • Classis: Gastropoda • Cladus: Caenogastropoda • Cladus: Sorbeoconcha • Familia: Turritellidae • Genus: Turritella • Species: Turritella terebralis Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file.Some paleontologists think gastropods are even older, based on a small, shelly fossil called Aldanella, known from Lower Cambrian rocks, but others think Aldanella is a worm.Either way, by the end of the Cambrian, gastropods were abundant and diverse, and they continue to be so up to the present day.
Because the fossil record of gastropods is based almost exclusively on the shells, paleontologists rely on living gastropods for information about the anatomy of their ancient relatives.
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The mouth is usually located on the underside of the head or at the end of a long retractable snout.
Inside the mouth is a feeding structure called the radula, made up of numerous tiny teeth (as many as 250,000) that scrape against a horny plate in the upper part of the mouth to shred food.