The Echinoid Directory

Stem group scutelliforms or laganiforms (and crown group neotenous derivatives)


 Scutellina with:

  • internal buttressing of simple adradial bars
  • basicoronal circlet with plates small and undifferentiated
  • periproct supramarginal to submarginal, opening posterior to the first post-basicoronal interambulacral plates
  • food grooves absent or rudimentary
Range  Early to Late Eocene; Europe (stem-group members only)