The Echinoid Directory

Family Astriclypeidae Stephanini, 1911, p. 747


 Scutellidea with:

  • complex internal buttresses forming microcanal system around periphery;
  • four gonopores;
  • ambulacral and interambulacral zones similar in width at ambitus; pores and tube-feet extending onto interambulacral zones;
  • petals well-developed, closed or nearly closed distally;
  • basicoronal circlet small, interambulacral elements pointed but not strongly projecting;
  • posterior interambulacral zone disjunct adorally;
  • periproct opening oral, associated with first pair of post-basicoronal interambulacral plates;
  • perradial notches or lunules in some or all ambulacra;
  • food grooves well developed, bifurcating at edge of basicoronal circlet and finely subdivided distally.
Range  Oligocene to Recent; Europe and North Africa, Indo-Pacific.