The Echinoid Directory

Fellius Cutress, 1980, p. 116

Diagnostic Features
  • Test relatively thin-plated with interambulacral zones quite strongly inflated; height about 50% diameter.
  • Apical disc less than 40% of test diameter; plating unknown.
  • Interambulacral zones with 9 or 10 plates in a series. Plates convex with large central primary tubercle; tubercles perforate and crenulate; areoles ovate, not incised; mamelons becoming proportionally larger adapically. Areoles separated, though never widely.
  • Ambital and adoral interambulacral plates wider than tall; no adapical plates with a rudimentary tubercle only.
  • Shallow interradial pits at triple suture junctions in some specimens.
  • Scrobicular tubercles differentiated; small and numerous. Extrascrobicular zones on adradial and interradial sides only; granulation dense and aligned with neural furrows between rows; granulation becoming finer away from the scrobicular circles.
  • Ambulacra almost straight; pore zones hardly incised. Pore pairs wide and conjugate, the two pores linked by a channel. Perradial suture depressed but not naked. Marginal series of contiguous primary tubercles and, immediately inside, a series of slightly smaller tubercles; the perradial zone with small granules often in two irregular rows.
  • Ambulacral plating simple throughout; no tubercle heterogeneity seen adorally.
  • Peristome very slightly smaller than apical disc; about 35% test diameter.
Eocene, Jamaica; ?Miocene.
Name gender masculine
Cidaris foveata Jackson, Arnold & Clark, 1927, p. 9, by original designation.
Species Included
  • F. foveata (Jackson, Arnold & Clark, 1927); Eocene, Jamaica.
  • F. pouechi (Cotteau, 1863); Middle -Upper Eocene, France and Spain.
  • Possibly also R. gastaldi (Desor, 1858); Miocene [conjugate pore-pairs and strongly crenulate tubercles].
Classification and/or Status

Cidaroida, Rhabdocidaridae.

Possibly monotypic.


Distinguished from Prionocidaris by its strongly crenulate tubercles. Differs from Rhabdocidaris in having uniform ambulacral tuberculation throughout. Distinguished from Porocidaris by its differentiated scrobicular tubercles and the lack of radial pits in its areoles.

Cutress, B. 1980. Cretaceous and Tertiary Cidaroida (Echinodermata; Echinoidea) of the Caribbean area. Bulletins of American Paleontology 77, 1-221.