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The Family Trigoniidae is a member of the Superfamily Trigonioidea. Here is the complete "parentage" of Trigoniidae:

• Domain: Eukaryota Whittaker & Margulis,1978 - eukaryotes
  • Kingdom: Animalia Linnaeus, 1758 - Linnaeus, 1758 - animals
    • Subkingdom: Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians
      • Branch: Protostomia Grobben, 1908 - Grobben, 1908 - protostomes
        • Infrakingdom: Lophotrochozoa - Lophotrochozoans
          • Superphylum: Eutrochozoa
            • Phylum: Mollusca (Linnaeus, 1758) Cuvier, 1795 - Molluscs
              • Class: Bivalvia linnaeus, 1758 - Bivalves
                • Subclass: Metabranchia
                  • Superorder: Filibranchia
                    • Order: Trigonioida
                      • Superfamily: Trigonioidea
                        • Family: Trigoniidae

The Family Trigoniidae is further organized into finer groupings including:

• Genus (17): Jaworskiella · Laevitrigonia · Linotrigonia · Myophorella · Neotrigonia · Orthotrigonia · Paulckella · Psilotrigonia · Pterotrigonia · Quadratotrigonia · Rutitrigonia · Steinmanella · Trigonia · Trigoniidae · Turbitrigonia · Vaugonia · Yaadia
• Species: ZipcodeZoo has pages for 305 species and subspecies in the Family Trigoniidae.