The Echinoid Directory

Echinopedina Cotteau, 1866, p. 262

[=Hebertia Lambert, 1910, p. 2 (objective), non Hebertia Michelin, 1859 ]

Diagnostic Features
  • Medium-sized, inflated with well-rounded ambitus.
  • Apical disc unknown; relatively small.
  • Ambulacra straight and relatively narrow; composed of trigeminate plating throughout. Alternating between simple element without primary tubercle and two elements forming a compound element and united by a small primary tubercle, the upper being occluded from the perradial suture.
  • Ambulacral and interambulacral tubercles identical in size; perforate and non-crenulate.
  • Interambulacral plates wider than tall; with small primary tubercle positioned centrally on each. On the interradial side of primary tubercles the plate is sparsely tuberculate while on the adradial side there is denser and coarser secondary tuberculation.
  • Buccal notches deep and U-shaped.
  • Perignathic girdle and spines unknown.
Eocene of Europe and North Africa (Libya).
Name gender feminine
Echinus gacheti Desmoulins, 1837, by original designation.
Species Included
  • E. gacheti (Desmoulins, 1837); Middle Eocene, France.
    Possibly also
  • E. biarritzensis (Cotteau 1893); Late Eocene, France.
  • E. granulosa (Lambert, 1902); Eocene, Spain.
  • E. libyca (de Loriol, 1881); Eocene, Libya.
Classification and/or Status

Acroechinoidea, Pedinoida, Pedinidae.

Probably paraphyletic by exclusion of Leiopedina and Loriolipedina.

The uniserial arrangement of pore-pairs distinguishes this genus from Leiopedina, while the similar sized ambulacral and interambulacral tubercles distinguishes it from all pedinids except Pedina. Pedina differs in having ambulacral plate compounding in which all elements are subequal and reach the perradius. In Echinopedina the upper element is reduced to a demiplate.

Cotteau, G. 1866. Échinides nouveaux ou peu connus (14). Revue et Magasin de Zoologie, 18, p. 262.