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Tetrastemmatidae

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Spiralia
Cladus: Lophotrochozoa
Phylum: Nemertea
Classis: Enopla
Ordo: Hoplonemertea
Subordo: Monostilifera
Familia: Tetrastemmatidae
Genera: Algonemertes - Amphinemertes - Arenonemertes - Nemertellina - Prostoma - Prostomatella - Prostomiopsis - Sacconemertella - Sacconemertes - Sacconemertopsis - Tetrastemma

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Source: Wikispecies: All text is available under the terms of the GNU Free Documentation License