The Echinoid Directory

Contributed by Andrew Smith, March 2008

Rhabdopleurus Cotteau, 1893, p. 594

[=Cryptocyphus Lambert & Thiery, 1914, p. 274 (objective)]

Diagnostic Features
  • Apical disc hemicyclic; ocular plate 1 exsert; other ocular plates insert.  Periproct opening large and circular.
  • Ambulacral plating trigeminate at ambitus and below, pore-pairs uniserially arranged.  Adapically irregularly alternating between triad and diad elements
  • Small primary tubercle on each compound plate
  • Interambulacral plates with single small primary tubercle and wide adradial and interradial zones of secondary granules.
  • Tubercles perforate and crenulate
  • Well-developed wedge-shaped sutural pit beneath each primary tubercle; better developed aborally than adorally.
Distribution Eocene, France
Name gender masculine
Type Glyphocyphus ataxensis Cotteau, 1886, p. 725, by original designation.
Classification and/or Status Camarodonta; Glyphocyphidae
Remarks Close to Ambipleurus but differing in the degree of test sculpturing developed.  In Ambipleurus there are large wedge-shaped depressions on either side of the primary tubercle separating successive plates in both ambulacral and interambulacral zones.  In Rhabdopleurus there is a small  triangular pit beneath each primary tubercle.

Cotteau, G. 1893 Paleontologie francaise. Terrains Tertiaires II Echinides Eocene. G. Masson, Paris.