The Echinoid Directory

Protocidaris Whidborne, 1899, p. 202

Diagnostic Features
  • Based on a fragment of four interambulacral plates plus associated spines.
  • Interambulacral plates thin, imbricate; each with a primary tubercle that is perforate and non-crenulate; no clear areole developed.
  • Spines slender and simple.
Upper Devonian, UK.
Name gender feminine
Eocidaris? acuaria Whidborne, 1896, p. 376, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Stem group Echinoidea; Indeterminate.



Indeterminate fragment that may come from a proterocidarid or an echinocystitid.

Jackson, R. T. 1912. Phylogeny of the Echini, with a revision of Palaeozoic species Memoirs of the Boston Society of Natural History 7, 491 pp. 76 pls.

Whidbourne, G. F. 1899 [for 1898]. The Devonian fauna of the South of England, Volume 3, part 3. Monograph of the Palaeontographical Society London: pp. 179-236, pls 22-38. (Issue 247, part of Volume 52)