Gastropods from the Cretaceous-Palaeogene boundary in Denmark Author Hansen, Thomas text Zootaxa 2019 2019-08-12 4654 1 1 196 journal article 26049 10.11646/zootaxa.4654.1.1 9ce1d103-9234-4fbe-9544-f1c294bb8783 1175-5326 3365803 CFD82CC0-3110-472E-972B-7ADC0C523A04 Genus Cerithiella Verril, 1882 Type species. Cerithium metula Lovén, 1846 (designation by Sars (1878) when erecting Lovenella Sars, 1878 , a name already in use). Recent, Europe. Remarks. It was suggested by Nützel (1998) that all fossil taxa with a planktotroph multispiral protoconch may have to be assigned their own genus or reassigned to other genera as all extant species of Cerithiella are characterized by a lecithotroph larval shell. It is clear that the present definition of the genus is rather wide and it seems plausible that the planktotrophic taxa in general would be closer related to each other than to the lecithotrophic forms. I do not think that there is any basis for a higher taxonomical reassignment of the planktotrophic forms within the cerithiopsids, as was suggested on a tentative basis by Nützel (1998) . Actually there are all grades of intermediates between the two groups and even within a single recent species like Cerithiella metula ( Lovén, 1846 ) as re-evalu- ated by Bouchet & Warén (1993) a surprisingly large variation in the protoconch morphology may be observed, depending on the environment or geographical location.