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The Echinoid Directory

Pedina L. Agassiz, 1838, p. 4

[=Megapedina Lambert & Thiery, 1910, type species Pedina charmassei Cotteau, 1885; =Propedina Lambert & Thiery, 1925, p. 566, (nomen vanum); = Hectopedina Thiery, in Collignon & Lambert, p. 268, type species Propedina hussoni Thiery, in Collignon & Lambert, 1928, p. 267.]

Diagnostic Features
  • Test flattened but with well rounded ambitus.
  • Apical disc small with large periproct; plating dicyclic.
  • Ambulacra relatively narrow and almost straight; plating trigeminate with primary tubercle on every other plate in type species. Ambulacral plating usually with all elements reaching the perradius.
  • Pore-pairs in strongly oblique arcs so as to form a relatively wide adradial band.
  • Interambulacral plates wider than tall, with a small primary tubercle at the centre of each. Primary tubercles separated in vertical series. Remainder of plate covered with sparse heterogeneous granules and small tubercles.
  • Primary interambulacral tubercles without distinct areole; perforate and non-crenulate.
  • Peristome small and buccal notches deep and sharp.
  • Perignathic girdle of small upright apophyses that do not meet perradially.
  • Spines and lantern unknown.
Distribution
Middle Jurassic (Bajocian) to Late Jurassic (Kimmeridgian).
Name gender feminine
Type
Pedina sublaevis L. Agassiz, 1838, by subsequent designation of Savin, 1905, p. 217.
Species Included
  • P. sublaevis Agassiz, 1838; Callovian, western Europe.
  • P. granulosa Agassiz, 1847; Bajocian to Bathonian of France.
  • P. davoustiana Cotteau, 1856; Callovian, western Europe.
  • numerous other species in need of revision.
Classification and/or Status

Pedinoida, Pedinidae.

Presumed monophyletic.
Remarks

Distinguished by its broad zones of pore-pairs and rather small, insignificant primary tubercles. Leiopedina is similar but has a more marked differentiation between the adradial and interradial tuberculation of interambulacral plates. Leptocidaris has a much larger apical disc and stronger primary tubercles. Its pore zones are also uniserial. Vadet et al. (1996) give plating diagrams of ambulacra and apical disc for the type species.

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

Agassiz, L. 1838. Monographies d'Échinodermes vivants et fossiles. Première monographie: Des Salénies. Petitpierre, Neuchâtel, 32 pp., 5 pls.