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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Deuterostomia (deuterostomes)
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Order Enterogona
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Family Polyclinidae
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Genus Ritterella
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Species Ritterella dispar
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Species Ritterella folium
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Species Ritterella glareosa
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Species Ritterella iturupica
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Species Ritterella mirifica
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Species Ritterella multistigmata
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Species Ritterella papillata
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Species Ritterella prolifera
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Species Ritterella pulchra
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Species Ritterella rete
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Species Ritterella sigillinoides
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Species Ritterella solida
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Species Ritterella tamarae
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Species Ritterella tokioka
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Species Ritterella vestita
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Species Ritterella yamazii
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