Squalicorax is an extinct genus of shark that lived during the Cretaceous period, approximately 113 to 66 million years ago. Though this genus is common in Cretaceous deposits throughout the world, paleontologists are rarely able to find any material beyond isolated teeth. Squalicorax, like modern sharks, has a skeleton primarily made of cartilage. Unlike bone, cartilage rarely fossilizes, which is why the much harder teeth are the more commonly preserved. Because of this, there is much yet unknown about these sharks (1). However, enough specimens have been discovered to make some inferences about this extinct shark. It is known that Squalicorax fed at least partially through scavenging, likely also feeding upon live prey (2). It was similar in appearance to modern sharks, with triangular fins, an elongate body, and rows of teeth continuously being replaced (3). It was moderately sized, approximately 2.5-3.5 m in length, possibly reaching up to 5 m (4, 5).
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