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The Echinoid Directory

Family Echinarachniidae Lambert, in Lambert & Thiery 1914, p. 314

Diagnosis

 Scutelliforms with:

  • internal buttressing of ambulacral stellate patches and adradial interambulacral bars;
  • basicoronal circlet pentastellate with interambulacral elements projecting;
  • periproct supramarginal to oral;
  • food grooves formed of a single perradial trunk that extends to the second post-basicoronal plate after which it may branch.
Range
 Middle Eocene to Recent; North Pacific (Japan to California) and North East Canada; southern USA.