The Echinoid Directory

Order Pedinoida Mortensen, 1939, p. 547


Acroechinoids with:

  • dicyclic apical disc firmly bound to corona
  • test rigid; plating tesselate 
  • primary tubercles perforate and non-crenulate
  • perignathic girdle of paired peg-like auricles which remain separate
  • lantern aulodont, with deep, V-shaped foramen magnum; teeth U-shaped in cross-section
  • spines cylindrical and smooth, without cortex or thorns. Primary spines solid, secondary spines may have a hollow lumen.
 Late Triassic (Norian) to Recent; widespread.
Species Included Only the family Pedinidae is included.  However, there are also two other genera that possibly also belong here and which are quite different from the Pedinida: Orthocidaris Cotteau, 1862, and Zardinechinus Kier, 1977. 
Classification and/or Status Euechinoidea, Acroechinoidea
Remarks The following genus remains too poorly known to be placed with certainty into the following key, but probably belongs here:

Engelia Tornquist, 1908

Mortensen, T. 1939. New Echinoida (Aulodonta). Preliminary Notice. Videnskabelige Meddelelser fra Danks naturhistorisk Forening i Kobenhavn 103, 547-550.

Mortensen, T. 1940. A Monograph of the Echinoidea. III, 1. Aulodonta, with Additions to Vol. II (Lepidocentroida and Stirodonta). C. A. Reitzel, Copenhagen, 370 pp.