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The Echinoid Directory

Family Stegasteridae Duncan, 1889, p. 211

Diagnosis

 Stegasterine holasteroids with:

  • thick test with flat base
  • Periproct marginal with distinct subanal bulge
  • meridosternous to orthosternous plastron
  • small circular peristome facing forward into deep oral groove
  • marginal fasciole generally present (may be absent in adults of some taxa).
Range
Upper Cretaceous (Coniacian) to Maastrichtian; worldwide