oceanic-zone:

The Frilled Shark is a deep-water shark that sports many “primitive” features,  leading it to be dubbed a living fossil.  Its name comes from the frilled appearance of its six pairs of gill slits.  Visible are its approximately 300 teeth,  with notable needle-like cusps and cusplets,  suited for feeding on squid.  Unlike most sharks,  it is unique in having a long,  slender,  eel-like body,  and unusual front-facing jaws,  as opposed to the underslung jaws of most shark species.

(source)

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