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Porifera (sponges)
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Class Demospongiae
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Order Hadromerida
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Family Polymastiidae
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Genus Sphaerotylus
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Species Sphaerotylus antarcticus
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Species Sphaerotylus borealis
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Species Sphaerotylus capitatus
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Species Sphaerotylus exospinosus
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Species Sphaerotylus exotylotus
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Species Sphaerotylus sceptrum
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Species Sphaerotylus vanhoeffeni
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