Lemon Shark – Negaprion brevirostrisEstimated length : Three and a half metres (11 feet)Age : Late Miocene, about 6 million years oldLocality : Venice Beach, FloridaLemon sharks are similar in shape to Requiem sharks, but have a large second dorsal fin. They inhabit shallow tropical coastal waters worldwide. They are shy, and not usually a threat to man unless provoked. Their fossil teeth are also similar to those of Requiem sharks, but are not serrated. The lower teeth are an inverted ‘T’ shape and the upper teeth are broadly triangular..