The Ribbon-sharks are a family of fish eating Sharks. After the extinction of almost all Cetaceans, Sharks moved into the niche that Dolphins left. To chase and catch fish they have evolved several adaptations to aid them in these tasks. Their body has elongated, becoming almost Eel shaped, their mouths have also elongated, vaguely resembling the Dolphins they've replaced and their teeth have become needle like.
The largest species is the Azure Bullet (Velocicthyes talassinus) at 4ms long. It is found in the Indian and Pacific oceans. It is azure blue in colour and is the second fastest Ribbon-shark.
The smallest species is the New Zealand Ribbon-shark (Potamovenator novaezealandensis) at 1m long. It lives in New Zealand rivers.