Squalicorax
Squalicorax, commonly known as the crow shark, is a genus of extinct lamniform shark known to have lived during the Cretaceous period. The genus had a global distribution in the Late Cretaceous epoch. Multiple species within this genus are considered to be wastebasket taxon due to morphological similarities in the teeth. Etymology. The name "Squalicorax" is derived from the Latin "squalus" for shark and the Greek κόραξ, ""korax"" for raven. Description. These sharks are of medium size, up to 5 m (usually around 2 m) in length. Their bodies were similar to the modern gray reef sharks, but the  shape of the teeth is strikingly similar to that of a tiger shark. The teeth are numerous, relatively small, with a curved crown and serrated, up to 2.5 – 3 cm in height. Large numbers of fossil teeth have been found in Europe, North Africa, and North America. Squalicorax is one of three Cretaceous lamniformes to garner serrations along with Pseudocorax and Galeocorax. "Squalicorax" was a coastal predator, but also scavenged as evidenced by a "Squalicorax" tooth found embedded in the metatarsal (foot) bone of a terrestrial hadrosaurid dinosaur that most likely died on land and ended up in the water . Other food sources included turtles, mosasaurs, ichthyodectids, and other bony fishes and sea creatures. Tooth marks from this shark have also been found on the bones of "Pteranodon", but whether the shark actively snatched such large pterosaurs out of the air, attacked them as they dove after prey, or was simply scavenging is not known. Description of selected species. The following are the best studied American species for which relatively complete skeletons are described: The world's largest and most complete semiarticulated fossil of "Squalicorax" was found in 2014 in stores of the Canadian Fossil Discovery Centre in Morden, Manitoba , in Canada, where it is now displayed. It measures more than 3 m in length.