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Outline of sharks : ウィキペディア英語版 | Outline of sharks
The following outline is provided as an overview of and topical guide to sharks: Sharks (superorder Selachimorpha) – a type of fish with a full cartilaginous skeleton and a highly streamlined body. The earliest known sharks date from more than 440 million years ago, before the time of the dinosaurs. == Fields that study sharks ==
*Ichthyology – branch of zoology devoted to fish (including sharks) *Meristics – branch of ichthyology that relates to counting features of fish, such as the number of fins or scales
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