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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Platyhelminthes (flatworms)
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Class Turbellaria
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Order Neorhabdocoela
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Family Typhloplanidae
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Genus Mesostoma
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Species Mesostoma arctica
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Species Mesostoma californianum
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Species Mesostoma columbianum
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Species Mesostoma craci
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Species Mesostoma curvipenis
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Species Mesostoma ehrenbergii
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Species Mesostoma macroprostatum
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Species Mesostoma platygastricum
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Species Mesostoma vernale
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Species Mesostoma virginianum
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