The Echinoid Directory

Family Laganidae Desor, 1858, p. 217


 Laganiformes with:

  • internal buttressing of circumferential partitions and branched radial bars;
  • periproct adoral, opening bounded by first and second post-basicoronal paired interambulacral plates - the first plates being elongate;
  • interambulacral zones terminating adapically in a single plate;
  • basicoronal circlet pentagonal to pentastellate with ambulacral plates projecting (points of pentagon perradial);
  • food grooves present; unbranched and perradial;
  • apical disc pentagonal, with points of pentagon interradial.
 Eocene to Recent; worldwide.