Sealife guideThe Semaeostomeae orderThe taxonomy of marine species

Explore the taxonomy of cnidarians and especially sea anemones, corals and jellyfish !
Blue jellyfish (Cyanea lamarckii)
Blue jellyfish
(Cyanea lamarckii)
Lion's mane jellyfish (Cyanea capillata)
Lion's mane jellyfish
(Cyanea capillata)
Atlantic sea nettle (Chrysaora quinquecirrha)
Atlantic sea nettle
(Chrysaora quinquecirrha)
Black sea nettle (Chrysaora achlyos)
Black sea nettle
(Chrysaora achlyos)
Compass jellyfish (Chrysaora hysoscella)
Compass jellyfish
(Chrysaora hysoscella)
Purple-striped jelly (Pelagia noctiluca)
Purple-striped jelly
(Pelagia noctiluca)
Sea nettle (Chrysaora fuscescens)
Sea nettle
(Chrysaora fuscescens)
Moon jellyfish (Aurelia aurita)
Moon jellyfish
(Aurelia aurita)

Our latestUpdates

The Atlantic tarpon
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.
The dugong
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.
Dolphins: ocean's smartest creatures
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
Ptérois nain (Dendrochirus brachypterus)
Ptérois nain
(Dendrochirus brachypterus)