Family Gryphaeidae : 1 Subfamily
 1/1  Subfamily Pycnodonteinae : 4 Genus 
   1/4  Genus Empressostrea : 1 Species 
     1/1 Empressostrea kostini
   2/4  Genus Hyotissa : 6 Species 
     1/6 Hyotissa hyotis
     2/6 Hyotissa inermis
     3/6 Hyotissa mcgintyi
     4/6 Hyotissa numisma
     5/6 Hyotissa quercinus
     6/6 Hyotissa sinensis
   3/4  Genus Neopycnodonte : 2 Species 
     1/2 Neopycnodonte cochlear
     2/2 Neopycnodonte zibrowii
   4/4  Genus Pycnodonte : 1 Species 
     1/1 Pycnodonte taniguchii
10 Species in Gryphaeidae 

(Extracted from WoRMS on October 2025)
NB: status "accepted" and "extant, not fossile-only"