| Starfish | Jellyfish | Sea Urchin | Octopus & Sea Cucumber |
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 |
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| Leather Starfish Dermasterias spp |
Upside-Down Sea Jelly Cassiopeia andromeda |
Fire Urchin Asthenosoma varium |
Common Nautilus Nautilus pompilius |
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 |
 |
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|
Mottled Starfish Evasterias troschelii |
Upside-Down Sea Jelly Cassiopeia xamachana |
Diadem Longspine
Sea
Urchin Diadema setosum |
Giant Octopus Octopus dofleini |
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 |
 |
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| Common Sun Star Crossaster papposus |
Sea Nettle Chrysaora melanaster |
Longspine
Sea
Urchin Centrostephanus longispinus |
Common Octopus Octopus vulgaris |
 |
 |
 |
 |
| Black &
Yellow Feather Starfish Lamprometra palmata |
Jellyfish Rhopilema esculenta |
Hatpin
Sea
Urchin Echinothrix calamaris |
Bigfin Reef Squid Sepioteuthis lessoniana |
 |
 |
 |
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| Smooth Sunstar Solaster endeca |
Blubber Jelly Catostylus mosaicus |
Hatpin
Sea
Urchin Echinothrix calamaris |
Common European Squid Loligo vulgaris |
 |
 |
 |
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|
Spiny Starfish Marthasterias glacialis |
Comb Jelly Mnemiopsis leidyi |
Red Slate Pencil Urchin Heterocentrotus mammillatus |
Common Cuttlefish Sepia officinalis |
 |
 |
 |
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| Common Starfish Asterias rubens |
Common Sea
Jellyfish Aurelia aurita |
Sea Egg Tripneustes ventricosus |
Reef Octopus Octopus cyanea |
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 |
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| Cushion Star Culcita novaeguineae |
Purple-Striped Jelly Pelagia noctiluca |
Sea Egg Tripneustes ventricosus |
Black Sea Cucumber Holothuria atra |
 |
 |
 |
 |
| Brittlestar Ophiura spp |
Whitespotted Jelly Phyllorhiza punctata |
Edible Sea Urchin Echinus esculentus |
Tubular
Sea Cucumber Holothuria tubulosa |
 |
 |
 |
 |
| Featherstar Antedon petasus |
Portuguese Man-of-War Physalia physalis |
Green Sea Urchin Stronglyocentrotus droebachiensis |
Sea Cucumber Psolus phantapus |
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| African
Redtip Star Protoreaster lincki |
Malaysian Jelly Sanderia malayensis |
Longspine Sea Urchin Echinus acutus |
Sea Apple Pseudocolochirus violaceus |
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 |
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|
| Rosy
Starfish Stichastrella rosea |
Irukandji Carukia barnesi |
(Leech) Order: Gnathobdellida |
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| (Fish
Louse) |
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| (Fish
Louse) |