Sealife guideThe Holothuroidea classThe taxonomy of marine species

Explore the taxonomy of marine echinoderms with a dedicated focus on starfish and sea urchins !

The class Holothuroidea, commonly known as sea cucumbers, are benthic marine animals characterized by an elongated, cylindrical body, often lacking the radial symmetry typical of other echinoderms, and possessing a digestive system that runs the length of their body.

Chocolate chip sea cucumber
(Isostichopus badionotus)

Australian sea apple
(Pseudocolochirus axiologus)

Orange sea cucumber
(Cucumaria miniata)

Sea Apple
(Pseudocolochirus violaceus)

Graeffe's sea cucumber
(Pearsonothuria graeffei)

Tiger tail sea cucumber
(Holothuria thomasi)

Pineapple sea cucumber
(Thelenota ananas)

Red striped sea cucumber
(Thelenota rubralineata)

Our latestUpdates

Monday, October 20th 2025

The Hawaiian archipelago, a volcanic gem of the pacific

Discover the Hawaiian archipelago, a volcanic paradise in the Pacific ocean where fiery mountains, lush forests and turquoise lagoons meet. Explore its islands, unique biodiversity and the geological forces that shaped this natural wonder.

Monday, October 13th 2025

Universal Epic Universe: the next-level immersive park

Discover Epic Universe, Universal Orlando's newest theme park. Dive into immersive worlds, spectacular attractions, and a breathtaking, one-of-a-kind experience.

Thursday, October 2nd 2025

The California sheephead

Discover the California sheephead, a colorful fish of the eastern Pacific. Learn about its appearance, diet, habitat in kelp forests, unique sex-changing ability and role in marine ecosystems.

Photo of the Day

Poisson guitare de l'Atlantique
(Rhinobatos lentiginosus)