The Echinoid Directory

Paurocidaris Kier, 1977, p. 18

Diagnostic Features
  • Test small (8 mm diameter), depressed; plating rigid.
  • Apical disc slightly less than half the test diameter; plates not bound to the corona; plating unknown.
  • Ambulacra narrow and almost straight; composed of simple plates throughout. No bevelling of ambulacral plates under interambulacral plates.
  • Pore-pairs small and non-conjugate. Perradial tuberculate zone very narrow (equal to pore-pair width); with a primary tubercle to each element.
  • Interambulacral zones wide with about 5 pentagonal plates in a column.
  • Single large primary interambulacral tubercle on each plate surrounded by scrobicular circle of enlarged tubercles. No extrascrobicular granulation.
  • Primary interambulacral tubercles with crenulate and perforate mamelon; mamelons increase in size adapically.
  • No buccal notches.
  • No lantern supports around the inner edge of the peristome.
Late Triassic (Carnian); Italy.
Name gender feminine
Cidaris rinbianchi Zardini, 1973, p. 11, by original designation. Holotype: Museo di Cortina d'Ampezzo, Italy, 125-M-Z.
Species Included
  • Only the type species.
Classification and/or Status

?Stem group Euechinoidea; Paurocidaridae.



Differs from Triadocidaris and other triadocidarids in having crenulate tubercles and ambulacral zones that are not bevelled beneath the interambulacral zones. Differs from more advanced Cidaroidea in lacking a perignathic girdle of apophyses.

Kier, P.M. 1977. Triassic echinoids. Smithsonian Contributions to Paleobiology 30, 1-88.