Sealife guideThe Hexanchiformes orderThe taxonomy of marine species

Explore the taxonomy of the sea vertebrates including the cetaceans like the whales or the dolphins, the sea birds, the fish, the sharks and the sea turtles !

The order Hexanchiformes includes sharks easily recognized by their six or seven gill slits, their ancient lineage, and their deep-sea habitats.

Frilled shark
(Chlamydoselachus anguineus)

Broadnose sevengill shark
(Notorynchus cepedianus)

Our latestUpdates

Wednesday, February 18th 2026

The Atlantic tarpon

The Atlantic tarpon is a large coastal fish that can grow up to 8 feet long and weigh over 330 pounds, with a silvery body covered in large, reflective scales. Known as the Silver King, it is famous for its spectacular leaps and fierce fight when hooked by sport fishermen.

Friday, January 30th 2026

The dugong

Discover the dugong, a gentle “sea cow” of tropical waters. Learn about its habitat, diet, reproduction, morphology, and the threats facing this unique marine mammal.

Friday, January 23rd 2026

Dolphins: ocean's smartest creatures

Discover dolphins, the ocean's geniuses: explore their intelligence, social behavior, sophisticated communication, species diversity and vital role in marine ecosystems.

Photo of the Day

Barracuda Méditerranéen
(Sphyraena viridensis)