Estonioceras imperfectum
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Domain: Eukaryota • Regnum: Animalia • Subregnum: Eumetazoa • Cladus: Bilateria • Superphylum: Protostomia • Phylum: Mollusca • Classis: Cephalopoda • Subclassis: Nautiloidea • Ordo: Tarphycerida • Familia: Estonioceratidae • Genus: Estonioceras • Species: Estonioceras imperfectum (Quenstedt, 1845)