The Echinoid Directory

Eurypetalum Kier, 1962, p. 140

Diagnostic Features
  • Test of medium size, elongate, blunted anterior margin, pointed posterior margin, moderately inflated, with a flat adoral surface.
  • Apical system tetrabasal, anterior, with four genital pores.
  • Petals broad, conspicuous, equal, closed. Pores conjugate, outer pores greatly elongated transversely, inner pores circular; ambulacral plates beyond petal with single pores.
  • Peristome anterior, pentagonal, with approximately equal to height.
  • Periproct inframarginal, small, transverse.
  • Bourrelets well developed, rounded; basicoronal plates longer than wide.
  • Phyllodes broad, single pored, with two series of pores in each half-ambulacrum.
Distribution
Upper Cretaceous (Maastrichtian) of France, Belgium and The Netherlands.
Name gender neuter
Type
Echinolampas faujasii Desmoulins, 1837, p. 346; by original designation.
Species Included
  • E. faujasii (Desmoulins, 1837); Maastrichtian, France, Belgium, The Netherlands.
Classification and/or Status
Irregularia; Cassiduloida; Faujasiidae; Faujasiinae.
Remarks

This genus is similar to Faujasia in its shape and petal arrangement, but is distinguished by its tetrabasal apical system, with the genital pores located in the genital plates. In Faujasia the apical disc is monobasal with the genital pores situated outside the genital plates in the interambulacra.

Eurypetalum is somewhat similar to Lefortia, but differs in having a transverse inframarginal periproct as opposed to the marginal, longitudinal periproct in Lefortia. Eurypetalum is distinct from Domechinus, as the latter genus has a monobasal apical system, with a more inflated test (Kier, 1962, p. 140).

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