Hi All Actually it is true that the radular tooth of typically piscivorous conus (when adult) undergoes ontogenetic changes when they are young until they become fully developed adults. I do know of several of such studies, one by Emilio Rolan on the ontogenetic changes of the radular tooth of Conus ermineus (actually the tooth goes through the stages vermivorous- intermediate vermivorous-molluscivorous and finally piscivorous), and another similar work by James Nybakken on the ontogenetic changes of the radular tooth of Conus magus. I can provide more accurate references, if desired. I guess that more works of this kind are probably available. warmest regards to all, Merry Christmas and All the best for the New Year Manuel J.Tenorio Jerez, SPAIN ---------------------------------------------------------------------- [log in to unmask] - a forum for informal discussions on molluscs To leave this list, click on the following web link: http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 Type your email address and name in the appropriate box and click leave the list. ----------------------------------------------------------------------