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Base of the evolutionary tree for Gryphaeidae

← parent
  • Gryphaeidae (16 species)
    • Pycnodonteinae → (15 species)
      • Hyotissa → (7 species)
        • Honeycomb Oyster (Hyotissa hyotis)
        • Hyotissa sinensis
        • Hyotissa numisma
        • Hyotissa inermis
        • mcginty oyster (Hyotissa mcgintyi)
        • Hyotissa imbricata
        • Hyotissa quercina
      • Pycnodonte → (6 species)
        • Pycnodonte kansasense
        • Pycnodonte cuarentaensis
        • Pycnodonte nigeriensis
        • Pycnodonte ewekoroensis
        • Pycnodonte taniguchii
        • Pycnodonte fischeri
      • Empressostrea kostini
      • giant deep-sea oyster (Neopycnodonte zibrowii)
    • Pycnogryphaea weberae

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