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.