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Sea squire illustrations from Ernst Haeckel.
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Sea Squirts

 Sea squirts, or ascidians, are a diverse class of marine invertebrates representing...
Illustrations of radiolarians from Ernst Haeckel.
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Radiolarians

 Of all of the species Haeckel described, he is most famous for his illustrations of...
Illustration of copepods from Ernst Haeckel.
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Copepods

 Copepods are aquatic crustaceans found in every marine habitat, from surface waters...
Sea anemone illustrations from Ernst Haeckel.
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Sea Anemones

 Sea anemones are members of the phylum Cnidaria, and as such are related to corals...
Starfish—marine invertebrates of the phylum Echinodermata—are famous for their ability to shed limbs as a means of defense and then regenerate the sacrificed part.
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Haeckel Starfish

 Starfish—marine invertebrates of the phylum Echinodermata—are famous for their...
Haeckel discovered a species of rhizostome jellyfish in Bellagemma, Ceylon, in December 1881. Its form so impressed him that he used it as a model for ceiling decorations in his Villa Medusa home in Jena.
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Rhizostome Jellyfish

 Haeckel was inspired by nature to create not only stunning scientific illustrations...
Sand dollars (like those pictured in this set of illustrations) are flattened, burrowing sea urchins. Dead, sunlight-bleached specimens resemble silver coins, hence their common name. These figures portray a sand dollar’s lifecycle from larva to adult.
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Sea Urchins

 Historically, sea urchins were known as sea hedgehogs due to their superficial...
The siphonophores are an order of marine animals in the phylum Cnidaria (the same phylum containing jellyfish). 
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Siphonophores

 The siphonophores are an order of marine animals in the phylum Cnidaria (the same...
Fireworm Setae
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Fireworm Bristles

 No, this isn't a bundle of paintbrushes: you're looking at a fireworm...
A couple inches wide and up to ten feet long, the bobbit worm stays hidden under tropical sands with just its five antennae poking out—waiting for prey to swim by.
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The Bobbit Worm

 There aren't any mummies or zombies buried under the seafloor: instead the ocean...
Syllid fireworms can be found mainly on the seafloor, but they switch to a planktonic form to reproduce, where the females use bioluminescent signals.
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Syllid Fireworms

 Syllid fireworms are a part of the Syllidae family, which is a type of...