The Echinoid Directory

Leiopleurus Lambert, 1902, p. 37

Diagnostic Features
  • Test small, depressed above and below with ambitus slightly below mid-height
  • Apical disc small but test damaged in one interambulacrum and could just be extended posteriorly
  • Ambulacra trigeminate and straight, with pore-pairs in arcs. Plating diadematoid with all three elements reaching the perradius and the middle element the largest. Every third pore-pair strongly insert on oral surface
  • Single primary tubercle on each ambulacral plate; overlapping all three elements adorally but only two adapically. Perradial zone relatively wide and covered in uniform granules
  • Interambulacral plates wider than tall; each with a single primary tubercle subcentrally placed. The remainder of the plate surface with uniform granules, arranged in transverse bands (ca. 4 deep)
  • All primary tubercles perforate and possibly crenulate (but preservation not good)
  • Peristome noticeably sunken, about 35% test diameter. Buccal notches deep and prominent with long tags in the adradial edge of interambulacral zones
  • Spines and lantern unknown
Distribution Eocene, Spain.
Name gender masculine
Type Psammechinus orbignyi Cotteau, 1883, p. ** by original designation.
Species Included Only the type species
Classification and/or Status

Euechinoidea, Camarodonta, Temnopleuroida, Glyphocyphidae

Subjective synonym of  Echinopsis Agassiz, 1840.

Remarks Lambert & Thiery (1911, p. 274) wrongly thought this name was preoccupied by Leiopleura Deyrolle, 1884.  In fact the name is available according to ICZN rules.  They synonymized the genus with Hebertia, here treated as a junior synonym of Echinopsis.

Lambert, J. 1902. Description des echinides fossiles de la province de Barcelone.  Memoires de la Societe geologique de France 24, p. 37.