The Echinoid Directory

• 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.

Pedina antiqua Cotteau, 1883, by original designation.

• T. antiqua (Cotteau, 1883); Callovian, France
• T. resecta (Lambert 1916); Callovian, Portugal

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.