The Echinoid Directory

Deneechinus Jackson, 1929, p. 22

Diagnostic Features
  • Test shape circular and depressed in profile; plating thin and imbricate.
  • Apical disc unknown.
  • Ambulacral structure biserial on upper surface at least; pore-pairs adradial; oral surface unknown.
  • Interambulacra composed of many small plates arranged into at least 10 columns. Individual plates thin, polygonal, scale-like, with small primary tubercle that is perforate and without a sunken areole; only scattered smaller tubercles around margins of the plate.
  • Peristome and lantern unknown.
  • Spines needle-like; without cortex; developed on both ambulacral and interambulacral plates.
Distribution
Upper Devonian, USA, Lower Carboniferous (Visean), Belgium.
Name gender masculine
Type
Deneechinus tenuispinus Jackson, 1929, p. 22, by original designation.
Species Included
Classification and/or Status

Stem group Echinoidea; Archaeocidaridae.

Presumed paraphyletic by exclusion of Polytaxicidaris and laterarchaeocidarids.

Remarks

Polytaxicidaris is very similar in form, having more than four columns of interambulacral plates in each zone, and rather long slender spines. In that taxon, however, the interambulacral plates are relatively large and there are just 5-6 columns of plates in each zone. In Deneechinus the interambulacral plates are small and more strongly imbricate and there are between 8 and 12 columns of plates in each zone.

Jackson, R. T. 1929. Paleozoic Echini of Belgium. Memoires de la Musee royal d'Histoire naturelle de Belgique 38, 96 pp, 10 pls.