The Echinoid Directory

Contributed by Andrew Smith, April 2007

Stereocidaris namadica Duncan, 1886, p. 87

[Cidaris namadicus Duncan, 1887, p. 87]

Diagnostic Features
  • Test large, almost as tall as wide.
  • Apical disc large; madreporite slightly larger than other genital plates; dicyclic, with heart-shaped ocular plates.
  • Ambulacra weakly sinuous; pores in each pair elongate, separated by relatively narrow, raised partition; not conjugate. Ambulacral tubercles; a primary and a slighltly smaller secondary tubercle to each plate forming regular columns; the inner columns not extending to the apex.
  • Interambulacra with 5-7 plates in a column; adapicalmost plate in each zone with rudimentary tubercle only; Primary tubercles large, with sunken areoles, surrounded by well defined scrobicular circle of ca. 15 tubercles. Interradial zone distinctly sunken and with fine, horizontally aligned granulation whioch becomes finer away from the primary tubercle.
  • Primary tubercles perforate and non-crenulate.
  • Distinct sutural pits at interradial triple junctions and along horizontal interambulacral sutures.
  • Peristome large, between 40 and 50% of test diameter.
  • Primary spines cylindrical, with short neck; shaft ornamented with rows of small thorns
Distribution Bagh Beds, Turonian-Coniacian, Upper Cretaceous, Madiar Pradesh, India
Type Geological Survey of India
Classification and/or Status A species of Stereocidaris
Remarks Duncan, P. M. 1887. Note on the Echinoidea of the Cretaceous series of the Lower Narbada Valley, with remarks upon their geological age. Records of the Geological Survey of India 20, 81-92, 1 pl.