Image: Carcharodon subauriculatus big

Description: A Carcharodon subauriculatus (jr synonym: C. chubutensis) tooth with a slant height of 129 mm.
Title: Carcharodon subauriculatus big
Credit: http://www.fossilguy.com/sites/calvert/calv_meg.htm
Author: Jayson Kowinsky
Permission:   This work is free and may be used by anyone for any purpose. If you wish to use this content, you do not need to request permission as long as you follow any licensing requirements mentioned on this page. Wikimedia has received an e-mail confirming that the copyright holder has approved publication under the terms mentioned on this page. This correspondence has been reviewed by an OTRS member and stored in our permission archive. The correspondence is available to trusted volunteers as ticket #2010051210049988. If you have questions about the archived correspondence, please use the OTRS noticeboard. Ticket link: https://ticket.wikimedia.org/otrs/index.pl?Action=AgentTicketZoom&TicketNumber=2010051210049988 Sure, use the image. About the license, the Creative Commons Attribution 3.0 looks the easiest, so use that.
Usage Terms: Creative Commons Attribution 3.0
License: CC BY 3.0
License Link: http://creativecommons.org/licenses/by/3.0
Attribution Required?: Yes