caa a22 4500 388017139 CHVBK 20180307124914.0 cr unu---uuuuu 161130e199809 xx s 000 0 eng 10.1017/S0022336000027190 doi S0022336000027190 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000027190 Vermeij Geerat J. Department of Geology and Center for Population Biology, University of California at Davis, One Shields Avenue, Davis 95616 New genera of Cenozoic muricid gastropods, with comments on the mode of formation of the labral tooth [Elektronische Daten] [Geerat J. Vermeij] Analysis of previously unstudied shell characters reveals the existence of three new genera of Cenozoic muricid neogastropods. These are the new genera Muregina (type species: Murex lugubris Broderip, 1833; ?early Miocene, Pliocene to Recent, eastern tropical Pacific); Kestocenebra (type species: Murex curvicosta Grateloup, 1840; early to late Miocene, Europe); and Edithais (type species: Concholepas drezi Vokes, 1972; early to late Miocene, circumtropical). A review of muricids with a labral tooth (a ventrally directed projection on the outer lip) shows that this structure forms in several distinct ways. It may form at the end of an external groove (as in Muregina) or cord (as in Kestocenebra), grow continuously or discontinuously, and lie at positions ranging from the upper end of the siphonal canal to just below the middle of the outer lip. The labral tooth evidently evolved independently several times, often quite recently in genera such as Muregina, in which older representatives lack a labral tooth. Copyright © The Paleontological Society Journal of Paleontology Cambridge University Press 72/5(1998-09), 855-864 0022-3360 72:5<855 1998 72 JPA https://doi.org/10.1017/S0022336000027190 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000027190 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Vermeij Geerat J. Department of Geology and Center for Population Biology, University of California at Davis, One Shields Avenue, Davis 95616 NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/5(1998-09), 855-864 0022-3360 72:5<855 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge