The Echinoid Directory

Leptocidaris Quenstedt, 1857, p. 644

Diagnostic Features
  • Test medium-sized ; depressed, with rounded ambitus.
  • Apical disc opening large; plating unknown.
  • Ambulacra almost straight, narrow; plating trigeminate. Pore-pairs uniserial.
  • Primary tubercle on every second or third ambulacral plate.
  • Interambulacral plates much wider than tall, with single large primary tubercle subcentrally positioned. Remainder of plate apparently covered in fine granulation only.
  • Tubercles imperforate and non-crenulate.
  • No information available on peristome.
  • Lantern, perignathic girdle and spines all unknown.
Distribution
Late Jurassic (Oxfordian); Germany.
Name gender feminine
Type
Leptocidaris triceps Quenstedt, 1857, p. 644, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Pedinoida, Pedinidae.

Monotypic.

Remarks
Unfortunately, this species has not been studied since Quenstedt\'s description and it is not known how reliable his illustrations are. If correctly depicted then Leptocidaris is a valid genus. Only two genera of pedinoid have ambulacra in which primary tubercles are developed only on every other plate, Pedina and Pseudopedina. Pedina is easily distinguished from Leptocidaris by its ambulacral pore-pairs, which are in strongly oblique arcs and form a wide adradial pore zone. Pseudopedina differs in having a much smaller apical disc and interambulacral tubercles that are displaced close to the adradial margin of ambital and aboral plates. For the present this genus is tentatively treated as valid.

Quenstedt, F. A. 1857 (May). Der Jura, vi + 842 pp., 100 pls. H. Laupp, Tübingen.