The Echinoid Directory

Contributed by Andrew Smith, October 2006

Eurysalenia Kier, 1966, p. A63

Diagnostic Features
  • Test small, circular and domed in profile.
  • Apical disc hemicyclic with posterior ocular plates insert; five gonopores.  Large suranal plate present, indenting anterior genital plates.
  • Ambulacra straight, moderately wide; plating trigeminate with all elements reaching the perradius.  Triads composed of two unequal elements united by a primary tubercle and alternating with a simple element.  P{ore-pairs uniserial.
  • Interambulacral plates a little wider than tall, with a single primary tubercle.
  • Primary tubercles perforate and crenulate; largest at ambitus and subambitally, much reduced in size above the ambitus; areole a little incised.
  • ~Peristome moderately large, slightly depressed, with shallow buccal notches.
  • Spines short (less than half the test diameter in length), straight and cylindrical without cortex.
  • Lantern unknown.
Distribution Upper Cretaceous (Campanian-Maastrichtian) of Wyoming, USA.
Name gender feminine
Type Eurysalenia minuta Kier, 1966, p. A63, by original designation.
Species Included Only the type species.
Classification and/or Status Euechinoidea, Camarodonta, Temnopleuroida, Zeuglopleuridae
Remarks Kier, P. M. 1966. A new Echinoid from the Cretaceous Pierre Shale of eastern Wyoming. In Gill, J. R. & Cobban, W. A. The rRed Bird section of the Upper Cretaceous Pierre Shale in Wyoming. Geological Survey Professional Paper 393-A, A62-A65.