Family Acanthasteridae
This family regroups the Crown-of-thorns starfish and its relatives.
Acanthaster mauritiensis – Crown of thorns starfish
Family Archasteridae
This family regroups the Sand Starfishes.
Family Asteriidae
This family regroups the Common starfishes and its relatives.
Asterias rubens – Common starfish
Pisaster ochraceus – Purple sea star
Family Asteropseidae
This family regroups the Leather starfishes and its relatives.
Dermasterias imbricata – Leather star
Family Asterinidae
This family regroups some of the Cushion starfishes species.
Patiria miniata – Bat star
Family Astropectenidae
This family regroups the Comb-stars and their relatives.
Family Solasteridae
This family regroups the Sunstars and their relatives.
Crossaster papposus – Common sunstar
Family Echinasteridae
This family regroups the Spiny starfishes and their relatives.
Echinaster callosus – Warty starfish
Echinaster sepositus – Red starfish
Family Goniasteridae
This family regroups the Marbled starfishes and their relatives.
Calliaster childreni – Children’s sea star
Family Ophidiasteridae
This family regroups the Snake-arm starfishes and their relatives.
Nardoa tuberculata – Mottled sea star
Family Luidiidae
This family regroups the Slender-armed starfishes and their relatives.
Family Oreasteridae
This family regroups the Greater cushion starfishes and their relatives.
Anthenea aspera – Cake sea star
Choriaster granulatus – Granulated cushion star
Culcita coriacea – Arabian cushion star
Pentaceraster mammillatus – Common knobbed star
Pentaceraster westermanni – Westermann’s knobbed star
Protoreaster nodosus – Chocolate chip sea star
Family Pycnopodiidae
This family regroups the Sunflower starfishes.
Pycnopodia helianthoides – Sunflower seastar
Family Ophiodermatidae
This family regroups the Smooth brittle-stars.
Family Ophiocomidae
This family regroups the Hairy brittle-stars.
Family Ophiolepididae
This family regroups the Striped brittle-stars and their relatives.
Family Ophiothricidae
This family regroups the Common brittle-star and its relatives.
Family Gorgonocephalidae
This family regroups the Basket-stars and their relatives.
Gorgonocephalus arcticus – Northern basket-star
Family Comasteridae
This family regroups the Feather-stars and their relatives.
Anneissia bennetti – Bennett’s feather star
Family Holothuriidae
This family regroups the true Sea Cucumbers and related species.
Holothuria forskali – Black sea-cucumber
Family Stichopodidae
This family regroups the Square sea cucumbers and their relatives.
Stichopus herrmanni – Curryfish
Family Cucumariidae
This family regroups the Thorny sea-cucumbers and their relatives.
Pseudocolochirus violaceus – Sea apple
Family Synaptidae
This family regroups the Conspicuous sea-cucumber and its relatives.
Opheodesoma spectabilis – Conspicuous sea cucumber
Family Abraciidae
This family regroups the European black sea-urchin and its relatives.
Family Diadematidae
This family regroups the Diadem urchins and their relatives.
Astropyga radiata – Star urchin
Diadema setosum – Diadem urchin
Echinothrix calamaris – Double-spined urchin
Family Cidaridae
This family regroups the Cidaris (or Pencil) urchins.
Cidaris cidaris – Long-spined slate pen sea-urchin
Eucidaris metularia – Ten-lined urchin
Eucidaris tribuloides – Slate pencil urchin
Family Echinometridae
This family regroups the Rock urchin species.
Echinometra mathaei – Rock-boring urchin
Family Echinidae
This family regroups the Round edible sea-urchin and its relatives.
Echinus esculentus – European edible sea urchin
Family Strongylocentridae
This family regroups the Giant red urchin and its relatives.
Family Temnopleuridae
This family regroups the Smoking urchin and its relatives.
Salmacis bicolor – Two-tone salmacis urchin
Family Parechinidae
This family regroups the Short-spined sea-urchins and other related species.
Family Toxopneustidae
This family regroups the Parsons’ hat sea urchin and its relatives.
Family Agelasidae
This family regroups the Agelas sponges (known as Dermosponges).
Family Aplysinidae
This family regroups both Aplysinid sponges.
Family Axinellidae
This family regroups the Antlers sponges and their relatives.
Axinella polypoides – Yellow antlers sponge
Family Clionaidae
This family regroups the Boring sponges and their relatives.
Family Chalinidae
This family regroups the Caribbean blue sponge and its relatives.
Haliclona cinerea – Purple encrusting sponge
Family Geodiidae
This family regroups the Elephant’s hide sponge and its relatives.
Pachymatisma johnstonia – Elephant’s hide sponge
Family Petrosiidae
This family regroups the Stony sponges and their relatives.
Xestospongia testudinaria – Barrel sponge
Family Suberitidae
This family regroups the Fig sponges and related species.
Family Microcionidae
This family regroups the Rugose sponges and their relatives.
Clathria rugosa – Orange ear sponge
Family Cionidae
This family regroups the translucent Sea-squirts and their relatives.
Family Clavelinidae
This family regroups the Claveline Sea-squirts and their relatives.
Family Pyuridae
This family regroups the Sea-squirts and their relatives.
Family Aglaopheniidae
This family regroups Feather-like hydrozoas.
Aglaophenia elongata – Elongated aglaophenia
Family Eudendridae
This family regroups some of the Flower-like hydrozoas.
