The Echinoid Directory

Thieulinipedina Vadet, Nicolleau & Pineau 1996, p. 43

Diagnostic Features
  • Medium-sized; test inflated with well-rounded ambitus.
  • Apical disc plating unknown; relatively large opening.
  • Ambulacra straight and about half the interambulacral width; composed of trigeminate plating throughout. Pore-pairs forming offset arc so as to create a broad pore zone.
  • All three elements reaching the perradius, in most plates. occasional occluded element in each triad in subambital region. Plate compounding in diadematid style with middle element the largest.
  • Ambulacral and interambulacral tubercles small and 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 the primary tubercle is a smaller secondary tubercle while on the adradial side there three or four even smaller tubercles.
  • Buccal notches deep and U-shaped.
  • Perignathic girdle and spines unknown.
Middle Jurassic (Callovian) of France and Portugal.
Name gender feminine
Pedina antiqua Cotteau, 1883, by original designation.
Species Included
  • T. antiqua (Cotteau, 1883); Callovian, France
  • T. resecta (Lambert 1916); Callovian, Portugal
Classification and/or Status

Pedinoida, Pedinidae.

Presumed monophyletic.


Like Diademposis in having prominent secondary tubercles but distinguished in having pore-pairs arranged in a broad zone rather than a single series and in having ambulacral and interambulacral tubercles of similar size. Very like Pedina in ambulacral plating and pore-pair arrangement but differing from that genus in having denser and more prominent tuberculation. It also has a primary ambulacral tubercle developed on each compound ambulacral plate.

Vadet, A., Nicolleau, P. & Pineau, J.P. 1996. Echinides du Callovien de la Sarthe et de l'Orne. Memoires de la Societe Academique du Boulonnais. Serie Histoire Naturelle 17, 1-184.