The Echinoid Directory

Contributed by Andrew Smith, September 2006

Heterocidaris Cotteau, 1860, p. 378

[=Heteroechinus Quenstedt, 1874, p. 370 (objective) ]

Diagnostic Features
  • Test with rounded ambitus, depressed in profile.
  • Apical disc size and plating unknown.
  • Ambulacra straight; plating and tuberculation unknown. Pore pairs stated to be uniserially arranged and not biserially offset.
  • Interambulacral plates wider than tall; flexed adapically. Each plate bearing two subequal tubercles.
  • Tubercles perforate and crenulate.
  • Adradial plate margin denticulate; ambulacral plates imbricate under interambulacral plates.
  • Peristome about 30% test diameter. Details unknown.
  • Spines and lantern unknown.
Distribution Middle and Upper Jurassic (Aalenian to Oxfordian), France.
Name gender feminine
Type Heterocidaris trigeri Cotteau, 1860, p. 378, by original designation
Species Included
  • H. trigeri Cotteau, 1860; Bajocian, Oxfordian, France 
Classification and/or Status Cidaroidea, Cidaroida, Heterocidaridae.

Monotypic.
Remarks

Unfortunately only a plastercast of the type specimen has been located and examined, along with some interambulacral fragments. Its wide interambulacral plates with two subequal primary tubercles immediately distinguishes this taxon from other cidaroids.

Cotteau, G. 1860. Note sur le genre Heterocidaris, nouveau type de la famille des Cidarides. Bulletin de la Societe geologique de France, serie 2 17, 378-381.