Can you tell me what kind of shark it's from? The pelvic fin weakly concave (curving inwards) rear margins, and the pectoral fin's outer margin is slightly convex (curving outwards), and both fins are weakly falcate. The shoulders of the tooth blades also feature sharp serrations the predator uses to crack the shells of clams and sea turtles. Lemon shark scales are large and overlapping with 3 to 5 ridges. Distinguishing Characteristics Lemon shark … They don’t have serrations along the blade and the teeth cusps are very high and curved. The upper teeth are narrow and broad with triangular smooth-edged cusps and finely serrated bases. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/1\/13\/Identify-Shark-Teeth-Step-1.jpg\/v4-460px-Identify-Shark-Teeth-Step-1.jpg","bigUrl":"\/images\/thumb\/1\/13\/Identify-Shark-Teeth-Step-1.jpg\/aid9509565-v4-728px-Identify-Shark-Teeth-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":"728","bigHeight":"546","licensing":"