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)
(Isostichopus badionotus)

Australian sea apple
(Pseudocolochirus axiologus)
(Pseudocolochirus axiologus)

Orange sea cucumber
(Cucumaria miniata)
(Cucumaria miniata)

Sea Apple
(Pseudocolochirus violaceus)
(Pseudocolochirus violaceus)

Graeffe's sea cucumber
(Pearsonothuria graeffei)
(Pearsonothuria graeffei)

Tiger tail sea cucumber
(Holothuria thomasi)
(Holothuria thomasi)

Pineapple sea cucumber
(Thelenota ananas)
(Thelenota ananas)

Red striped sea cucumber
(Thelenota rubralineata)
(Thelenota rubralineata)
Our latestUpdates

Thursday, April 23rd 2026
Where to see groupers in the Mediterranean ?
Discover where to see groupers in the Mediterranean: the best diving spots and protected marine areas to observe this iconic fish in its natural habitat.

Monday, April 20th 2026
The broadnose sevengill shark
Discover the broadnose sevengill shark (Notorynchus cepedianus), a large primitive coastal shark with seven gill slits living in temperate and subtropical waters around the world.

Monday, March 2nd 2026
The blueface angelfish
The blueface angelfish is a very colorful fish of the tropical coral reefs of the Indo-Pacific, recognizable by its bright blue head and its bluish body finely reticulated with yellow.
Photo of the Day

Poisson perroquet royal
(Scarus vetula)
(Scarus vetula)
