<page_title> Registry of World Record Size Shells </page_title> <section_title> Largest species </section_title> <table> <cell> Syrinx aruanus <col_header> Species† </col_header> </cell> <cell> Gastropoda <col_header> Class </col_header> </cell> <cell> 772.0 <col_header> World record size (mm) </col_header> </cell> </table>
The fourth largest species, and the largest of all gastropods, is Syrinx aruanus with a maximum length of 772.0 mm.