The Echinoid Directory

Devonocidaris Thomas, 1924, p. 500

Diagnostic Features
  • Type species based on disarticulated material. Test shape unknown; plating thin and imbricate.
  • Apical disc unknown.
  • Ambulacral structure unknown; ambulacral plates small; pore-pair slightly elongate.
  • Each interambulacral plate with a central primary tubercle that is perforate and non-crenulate; no surrounding scrobicular circle or depressed areolar region. A few smaller secondary tubercles or granules present around edges of plate.
  • Peristome and lantern unknown.
  • Spines relatively long and needle-like; without cortex.
Upper Devonian, USA.
Name gender feminine
Devonocidaris jacksoni Thomas, 1924, by original designation.
Species Included
  • Only the type species. Two other species have been assigned to this genus, but these are treated here as species of Deneechinus: D. primaevus Belanski, 1928; Upper Devonian, Iowa, USA; D. thomasi Stainsbrook, 1937; Devonian, Iowa, USA
Classification and/or Status

Stem group Echinoidea; ?Archaeocidaridae.

Monotypic; type species based on fragmentary material andbasically indeterminate.


The type material cannot really be compared meaningfully with other taxa because it is based on isolated elements. The rather slender spines and presence of a primary perforate tubercle on interambulacral plates suggests affinities with Archaeocidaridae such as Deneechinus. The name is best treated as a nomen dubium and restricted to the type material.

Thomas, A. O. 1924. Echinoderms of the Iowa Devonian. Iowa Geological Survey Annual Reports 1919-1920, 29, 385-552.