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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.
Distribution	Upper Devonian, UK.
Name gender	feminine
Type	Eocidaris? acuaria Whidborne, 1896, p. 376, by original designation.
Species Included	Only the type species.
Classification and/or Status	Stem group Echinoidea; Indeterminate. Monotypic.
Remarks	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)