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Carcharocles angustidens
''Carcharocles angustidens'' is a prehistoric megatoothed shark, which lived during the Oligocene and Miocene epochs approximately 35 to 22 million years ago. This shark is believed to be closely related to another extinct megatoothed shark, ''C. megalodon''.〔 However, just as in the case of ''C. megalodon'', the classification of this species is also under dispute.
==Fossil record==
As is the case with most extinct sharks, this species is also known from fossil teeth and some fossilized vertebral centra. Shark skeleton is composed of cartilage and not bone, and cartilage rarely gets fossilized. Hence, fossils of ''C. angustidens'' are generally poorly preserved. To date, the best preserved specimen of this species have been excavated from New Zealand, which comprises 165 associated teeth and about 35 associated vertebral centrum. This specimen is around 26 million years old. ''C. angustidens'' teeth are noted for their triangular crowns and small side cusps that are fully serrated. The serrations are very sharp and very well pronounced. ''C. angustidens'' was a widely distributed species with fossils found in North America,〔 South America,〔 Europe,〔 Africa,〔 New Zealand,〔 Japan,〔 Australia,〔 and Malta.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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