The Echinoid Directory

Leptopleurus Lambert & Thiery, 1914, p. 275

[pro Lepidopleurus Duncan & Sladen, 1885, p. 306, non Risso, 1826 ]

Diagnostic Features	Test small, hemispherical. Apical disc small, dicyclic. Genital plates without tubercles. Periproct opening subcircular. Ambulacra moderately wide, plating trigeminate; pore-pairs arranged uniserially throughout and compound in echinid style.. A single priomary tubercle to each plate, placed adjacent to the pore zone. Tubercles connected both vertically and across by low beaded ribs. Interambulacral plates with single primary tubercle centrally placed. Remainder of plate with miliaries and granules. Primary tubercle with weak radial ornament. Sutures incised Primary tubercles imperforate and non-crenulate. Peristome small with feeble buccal notches Spines and lantern unknown.
Distribution	Miocene, Pakistan.
Name gender	masculine
Type	Lepidopleurus hemisphaericus Duncan & Sladen, 1885, p. 306, by original designation.
Species Included	L. hemisphaericus (Duncan & Sladen, 1885); Miocene, Pakistan. Lambert & Thiery included one other species, L. granulatus Duncan & Sladen, 1885, from the same beds.
Classification and/or Status	Euechinoidea; Camarodonta, Temnopleuroida, Trigonocidaridae. Monotypic.
Remarks	This species differs from Ortholophus in having primary tubercles in the ambulacra linked by beaded ribs across the perradius. Duncan, P. M. & Sladen, W. P. 1885. Fossil Echinoidea of Sind. V, The Gaj or Miocene Series. Palaeontologia Indica 14 series, 1(3), 273-367, pls 44-55. Lambert, J. & Thiery, P. 1909-1925. Essai de Nomenclature Raisonnée des Echinides. L. Ferrière, Chaumont, fasc. 1: i-iii, 1-80, pls 1-2 (March 1909); fasc. 2: 81-160, pls 3-4 (July 1910); fasc. 3: 161-240, pls 5-6 (May 1911); fasc. 4: 241-320, pls 7-8 (March 1914); fasc. 5: 321-384, pl. 9 (Sept. 1921); fasc. 6-7: 385-512, pls 10-11, 14 (Dec. 1924); fasc. 7-8: 513-607, pls 12, 13, 15 (Feb. 1925).