Willemia multilobata Gers & Deharveng, 1985
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Withius piger (Simon, 1878)
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Terrestre
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Establecida
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Arachnida
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IP
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No endémico
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Wolffia arrhiza (L.) Horkel ex Wimm.
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Arroz de agua
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Terrestre
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Establecida
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Liliopsida
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ISN
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No endémico
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Womersleyella setacea (Hollenberg) R.E. Norris
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Marino
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Establecida
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Florideophyceae
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ISI
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No endémico
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Xanthium orientale L.
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Terrestre
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Establecida
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Magnoliopsida
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ISN
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No endémico
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Xanthium orientale L. subsp. italicum (Moretti) Greuter
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Cachurrera bardana
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Terrestre
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Establecida
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Magnoliopsida
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ISN
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No endémico
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Xanthium spinosum L.
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Cachurrera, cardillo
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Terrestre
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Establecida
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Magnoliopsida
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ISN
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No endémico
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Xenopsylla brasiliensis (Baker, 1904)
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Pulga tropical de la rata
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Terrestre
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Establecida
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Hexapoda
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ISN
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No endémico
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Xenopsylla cheopis (Rothschild, 1903)
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Pulga común de la rata
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Terrestre
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Establecida
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Hexapoda
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ISN
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No endémico
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Xenylla grisea Axelson, 1900
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Xenylla humicola Tullberg, 1869
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Xenylla nitida Tullberg, 1871
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Xenylla welchi Folsom, 1916
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Xerochrysum bracteatum (Vent.) Tzvelev
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Flor de paja
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Terrestre
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Establecida
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Magnoliopsida
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ISN
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No endémico
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Xerotricha apicina (Lamarck, 1822)
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Terrestre
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Establecida
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Gastropoda
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IP
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No endémico
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Xerotricha conspurcata (Draparnaud, 1801)
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Terrestre
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Establecida
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Gastropoda
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IP
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No endémico
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Xiphophorus helleri Heckel, 1848
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Terrestre
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Establecida
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Actinopteri
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ISP
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No endémico
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Xiphophorus maculatus (Günther, 1866)
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Terrestre
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Establecida
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Actinopteri
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ISP
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No endémico
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Xyleborinus saxesenii (Ratzeburg, 1837)
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Terrestre
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Establecida
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Hexapoda
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IP
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No endémico
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Xyleborus perforans (Wollaston, 1857)
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Terrestre
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Establecida
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Hexapoda
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ISP
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No endémico
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