The Echinoid Directory

Subfamily Coenholectypinae Smith & Wright, 1999


 Holectypidae with:

  • all five genital plates in the apical disc perforated by a gonopore;
  • no internal buttressing.
Early Cretaceous (Aptian) to Late Cretaceous (Maastrichtian); worldwide.
Although a couple of species of Discoidinae have all five genital plates perforated by gonopores, these have well developed internal buttressing and clearly have evolved a fifth gonopore independently. Coenholectypinae lack internal buttressing and evolved from taxa currently placed within the genus Holectypus.