The Echinoid Directory

• Test inflated to domal.
• Apical disc dicyclic and bound to the corona; relatively small.
• Ambulacra narrow and almost straight; composed of trigeminate plates throughout with primary tubercle on every second or third compound plate only.
• Pore-pairs small and non-conjugate. Uniserial at ambitus and aborally but expanded to form phyllodes adorally.
• Interambulacral zones wide.
• Single large primary interambulacral tubercle towards adradial margin of plates at the ambitus and aborally; much larger than ambulacral tubercles. Remainder of plate with sparse, small granules.
• Primary interambulacral tubercles non-crenulate and perforate.
• Buccal notches deep and sharp.
• Small lantern supports (apophyses) on first interambulacral plates.
• Spines unknown. Lantern with grooved teeth.

Jurassic (Bajocian to Oxfordian), western Europe.

Pseudopedina nodoti Cotteau, 1858, p. 223 by monotypy. Cotteau (1884, p. 662: Paleontologie francaise) later treated this species as a junior synonym of Pedina bakeri Wright, 1854.  However, Vadet & Slowik (2001, p. 14) synonymize it with Echinus divionensis Michelin, 1854), which seems more likely given its large secondary interambulacral tubercles.

• P. bakeri (Wright, 1858); Bajocian, England and France
• P. divionensis (Michelin, 1854)); Bajocian-Bathonian, France
• P. elegans de Loriol, 1891; Oxfordian, Europe.
• P. granulosa Agassiz, 1847; Bathonian, France.
• P. toutanensis Lambert, 1933; Pliensbachian, Morocco

Pedinoida, Pedinidae.

Presumed monophyletic.

Distinguished from pedinoids other than Pedina in having a primary tubercle on every second or third ambulacral plate. Distinguished from Pedina in having uniserial pore zones and large adradially positioned primary interambulacral tubercles on otherwise rather naked plates. Close to Leptocidaris Quenstedt, but that genus has a larger apical disc opening and more subcentral interambulacral tubercles.

The lantern of the type species is described by Vadet & Schmit (1995).

Cotteau, G. 1858. Echinides nouveau ou peu connu. Revue et Magazin de Zoologie 10, 212-224, pls 5, 6.

Cotteau, G. 1880-1885. Paleontologie francaise. Terrains jurassiques. 10. Echinides reguliers. G. Masson, Paris.

Vadet, A. & Schmit, 1995. Structure de l\'appareil masticateur de Pseudopedina divonensis. Memoires de la Societe Academique du Boulonnais 16, p. 98 only).

Vadet, A. & Slowik, D. 2001. Les oursins du Bajocien de Liocourt. Memoires de la Societe academique du Boulonnais. Series Histoire Naturelle 22 (1), 1-48.