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I recently collected some micro-matrix from Rattlesnake Creek in Gainesville. See my other posting if you want to read more about that here: http://www.thefossilforum.com/index.php?/topic/58470-rattlesnake-creek-rendezvous/?p=622403 This morning while sorting through the micro-matrix I spotted an unusual (for me) tiny shark tooth that has me guessing. This little one is only about 4.5 mm across the base of the root and around 5 mm along the long edge of the blade. It is novel solely due to the presence of the side cusp(s). There is an obvious side cusp on the side toward which the main cusp angles and there appears to be a bit up a "bump" in the enamel at the other side of the tooth that is subtle but apparent when looking at the tooth under magnification but, unfortunately, does not photograph very well. Basically, there appears to be a faint "notch" at the base of the long edge of the main cusp and the enamel is ever so slightly raised past this notch. The tooth does not really resemble the tiny Tiger Shark or Sand Tiger teeth which I know to have additional side cusps. The root is too flat and not as U-shaped as I'd expect for a posterior Sand Tiger tooth. It also doesn't seem to have the correct "bend" that I'm used to for the various species of Tiger Shark teeth that I'm familiar with from locations in South Florida. Any help with a possible identification on this tiny little mystery tooth would be welcome and educational--for me and possibly for other readers. Cheers. -Ken