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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Class Adenophorea
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Subclass Chromadoria
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Order Monhysterida
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Family Monhysteridae
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Genus Theristus
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Species Theristus acer
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Species Theristus ambronensis
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Species Theristus arcticus
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Species Theristus australis
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Species Theristus biarcospiculum
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Species Theristus buetschlii
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Species Theristus buetschlioides
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Species Theristus calx
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Species Theristus camelopardalis
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Species Theristus leptosoma
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Species Theristus littoralis
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Species Theristus metaflavensis
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Species Theristus modicus
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Species Theristus oistospiculum
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Species Theristus ostentator
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Species Theristus otoplanobius
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Species Theristus paraelaboratus
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Species Theristus parambronensis
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Species Theristus parvulus
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Species Theristus polychaetophilus
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Species Theristus problematicus
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Species Theristus rhynchonemoides
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Species Theristus sinuosus
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Species Theristus uncinatus
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Species Theristus wimmeri
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