The Echinoid Directory

Suborder Pygasterina Durham & Melville, 1957

[ex Order Pygasteroida; =Pileatoida Lambert, 1900]


 Holectypoida with:

  • periproct on aboral surface, either in direct contact with apical disc plates or separated by interambulacral plates;
  • apical disc compact with four genital plates, the posterior being absent (or at least not forming an integral part of the remainder of the disc).
Middle Jurassic (Bajocian) to Late Cretaceous (Maastrichtian); Europe, Middle East, North America and the Caribbean.
Readily distinguished from Holectypina by the aboral rather than oral periproct