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Eumetazoa (metazoans)
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Class Hydrozoa
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Order Leptothecata
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Family Laodiceidae
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Genus Ptychogena
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Species Ptychogena antarctica
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Species Ptychogena aurea
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Species Ptychogena californica
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Species Ptychogena crocea
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Species Ptychogena hyperborea
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Species Ptychogena lactea
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Species Ptychogena longigona
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