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Eumetazoa (metazoans)
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Bilateria (bilaterally symmetrical animals)
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Protostomia (protostomes)
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Arthropoda (arthropods)
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Chelicerata (spiders, mites, scorpions, and relatives)
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Class Pycnogonida
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Order Not assigned
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Family Ammotheidae
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Genus Achelia
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Genus Acheliana
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Genus Ammothea
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Genus Ammothella
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Genus Anisopus
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Genus Ascorhynchus
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Genus Austroraptus
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Genus Bathyzetes
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Genus Biammothea
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Genus Boehmia
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Genus Calypsopycnon
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Genus Chonothea
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Genus Cilunculus
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Genus Dromedopycnon
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Genus Elassorhis
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Genus Ephyrogymna
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Genus Eurycyde
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Genus Hedgpethius
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Genus Hemichela
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Genus Heterofragilia
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Genus Megarhetus
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Genus Nymphonella
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Genus Nymphopsis
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Genus Oorhynchus
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Genus Paranymphon
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Genus Proboehmia
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Genus Prototrygaeus
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Genus Pycnofragilia
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Genus Scipiolus
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Genus Sericosura
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Genus Tanystylum
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Genus Trygaeus
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