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Jellyfish illustrations from Ernst Haeckel.
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Semaeostome Jellyfish

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Sea squire illustrations from Ernst Haeckel.
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Sea Squirts

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Illustrations of radiolarians from Ernst Haeckel.
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Radiolarians

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Illustration of copepods from Ernst Haeckel.
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Copepods

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Sea anemone illustrations from Ernst Haeckel.
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Sea Anemones

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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

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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

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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

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The siphonophores are an order of marine animals in the phylum Cnidaria (the same phylum containing jellyfish). 
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Siphonophores

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Illustration of colorful nudibranchs from Ernst Haeckel.
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Nudibranchs

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