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To understand and id fossil shark teeth it really helps if you are familiar with extant shark teeth. I’ve been taking more pictures of my extant shark jaws. This post contains pictures of an extant Heterodontus zebra (Zebra Bullhead Shark) taxidermy specimen and an additional jaw. Links to my previous TFF posts on extant shark jaws can be found at the below TFF link. My Extant Shark Jaw Collection Below is a 23 inch long taxidermy specimen. Adult specimens can reach 122 cm in length. Adult body colors can vary but usually range from white to cream with black or dark brown zebra-like narrow vertical saddles and bands. Juveniles have red-brown bands: This shark is a male based upon the claspers shown in the below picture: Pictures of the dorsal fin spines on the first (note this spine is damaged at the tip) and second dorsal fins: The jaw: The placoid scales are more spread out on the dorsal side (back or upper side) and much denser on the ventral side (belly or lower side) of the shark. The shape of the placoid scales varies depending on the body area of the shark. Placoid scales on the head between the shark’s eyes from a dark band and a light area. Placoid scales on the dorsal side of a pectoral fin: Placoid scales from the ventral side near the jaw: Continued in next reply Marco Sr.