The Echinoid Directory

Eupholidocidaris Kier, 1956, p. 15

Diagnostic Features
  • Test shape probably depressed, circular; plating rhomboidal and imbricate.
  • Apical disc monocyclic and relatively small with five larger genital plates and five smaller ocular plates. Genital plate 2 largest and with hydropores; genital plates with an arc of gonopores on each.
  • Ambulacra narrow adapically, expanded at ambitus and adorally; multiserial from close to apex to peristome. Aboral plates small and with small, unspecialized pore-pair; adoral plates larger and dominated by large, subcircular pore-pair with prominent peripodial rim.
  • No internal flanges to ambulacral plates.
  • Interambulacral zones wider than ambulacral zones; composed of 8 or 9 columns of polygonal plates arranged into rows.
  • Subcentral primary tubercle present on most interambulacral plates, plus smaller marginal tubercles.
  • Lantern present; structure unknown.
  • Spines short and simple.
Carboniferous, Ireland & USA.
Name gender feminine
Eupholidocidaris brightoni Kier, 1956, p. 15, by original designation.
Species Included
  • E. brightoni Kier, 1956; Lower Carboniferous, Ireland.
  • E. belli Kier, 1957; Upper Carboniferous (Westphalian), Texas, USA.
Classification and/or Status

Stem group Echinoidea; Proterocidaridae.

Monotypic; subjective junior synonym of Proterocidaris de Koninck, 1882.


Kier (1957) added a second species to this genus but later, in 1962, synonymized his genus with Proterocidaris.

Kier, P. M. 1956. A new genus of echinoid from the Palaeozoic of Ireland. Geological Magazine 93, 15-17, pl. 1.

Kier, P. M. 1957. A new Upper Carboniferous echinoid from Texas. Geological Magazine 94, 326-328.

Kier, P. M. 1962. Redescription of some Lower Carboniferous echinoids from Belgium. Institut royal des Sciences naturelles de Belgique, Bulletin 38(5), 1-12, pls 1-6.