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Hippopodius
Genus, Coelenterate (=cnidarian), Marine
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Hoplangia
Genus, Coelenterate (=cnidarian), Marine
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Hormathia
Genus, Coelenterate (=cnidarian), Marine
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Hybocodon
Genus, Coelenterate (=cnidarian), Marine
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Hydra – Hydra
Genus, Coelenterate (=cnidarian), Freshwater, marine, terrestrial
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Hydractinia
Genus, Coelenterate (=cnidarian), Marine
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Hydrallmania
Genus, Coelenterate (=cnidarian), Marine
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Hydranthea
Genus, Coelenterate (=cnidarian), Marine
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Hydrodendron
Genus, Coelenterate (=cnidarian), Marine
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Isidella
Genus, Coelenterate (=cnidarian), Marine
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Isozoanthus
Genus, Coelenterate (=cnidarian), Marine
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Javania
Genus, Coelenterate (=cnidarian), Marine
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Keratoisis
Genus, Coelenterate (=cnidarian), Marine
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Kirchenpaueria
Genus, Coelenterate (=cnidarian), Marine
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Kophobelemnon
Genus, Coelenterate (=cnidarian), Marine
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Lafoea
Genus, Coelenterate (=cnidarian), Marine
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Lafoeina
Genus, Coelenterate (=cnidarian), Marine
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Laodicea
Genus, Coelenterate (=cnidarian), Marine
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Laomedea
Genus, Coelenterate (=cnidarian), Marine
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Leiopathes
Genus, Coelenterate (=cnidarian), Marine