The Echinoid Directory

• Test large, subcircular in outline, inflated, with a flat adoral surface.
• Apical disc central; monobasal, with four gonopores.
• Petals well developed; bowed and open distally. Pore-pairs small, subconjugate; the inner pores round, the outer pores elongated transversely. The two columns of pores-pairs in each petal of slightly unequal lengths; pores beneath petals single.
• Peristome subcentral, pentagonal, wider than long.
• Periproct inframarginal and transverse.
• Phyllodes single pored, with two series in each half ambulacrum, plus a few scattered pores in between.
• Bourrelets moderately developed, with a distinct well leading to the peristome opening.
• Buccal pores present.
• Tubercles the same size adorally as adapically.

Miocene of Europe.

Clypeaster hemisphericus Lamarck, 1816, p. 143; by original designation.

• Macrolampas hemisphericus (Lamarck, 1816); Miocene, France

Irregularia; Cassiduloida; Echinolampadidae.

Subjective junior synonym of Echinolampas Gray, 1825.

Macrolampas has a slightly flatter adoral surface than the type species of Echinolampas. However, it is still slightly sunken towards the peristome and the periproct is inframarginal rather than being on a flat oral surface. Macrolampas should therefore be considered a subjective junior synonym of Echinolampas.

Lambert & Thiery (1909-1925) use the type species of Macrolampas for describing their section (subgenus) two of Echinolampas; to which they refer 32 species.

P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections, 144 (3) 262 pp.

J. Lambert & P. Thiery. 1909-1925. Essai de nomenclature raisonnee des echinides. Libraire Septime Ferriere, Chaumont, 607 pp., 15 pls.

Lambert, J. 1907. Etude sur les Echinides fossiles de la molasse de Vence. Annales de la Societe des Lettres, Science et Arts Alpes-Maritimes 20, 64 pp, 2 figs, 10 pls [for 1906]