A NOMENCLATURE FOR THE RADULA OF THE CEPHALOPODA (MOLLUSCA) - LIVING AND FOSSIL

A nomenclature for the teeth of the radula of fossil and living Cephal opoda is proposed. The names suggested can be used for the 13 elements (teeth and plates) across each transverse row of the radula of Nautil oidea (fossil and extant), and, by retaining the names for all except the two outer elements on either side, for the nine elements in Ammono idea (fossil) and Coleoidea (fossil and extant). One transverse row of the radula has a central rhachidian tooth, and on either side lateral tooth 1, lateral tooth 2, marginal tooth 1, marginal plate 1, margina l tooth 2, marginal plate 2, the last two being present only in the Na utiloidea.