The Echinoid Directory

Family Faujasiidae Lambert, 1905, p. 13

[nom. correct Faujasidae Lambert, 1905, p. 13]

Diagnosis

Cassiduloids with:

  • apical system compact; monobasal or tetrabasal with genital plates other than G2 greatly reduced;
  • petals usually present and lanceolate to bowed;
  • ambulacral plates single pored beyond petals (except in Ochetus);
  • phyllodes widening towards peristome, with an inner and outer series, the outer series often reduced to a small number of adambital pores;
  • buccal pores small, outward facing, far removed from the other pores of the phyllode (except in Petalobrissus);
  • bourrelets: basicoronal plate longer than wide, projecting, tooth-like; specialized perioral spines and tubercles present on vertical walled entrance to peristome, extending laterally along basicoronal plate, forming U-shaped rim;
  • naked granular zone in interambulacrum 5.
Range
Upper Cretaceous (Cenomanian) to Miocene.
Remarks
The Faujasiidae are distinguished by their strongly developed tooth-like bourrelets, with typically broad phyllodes and broad petals. The basicoronal interambulacral plates are longer than wide, in marked contrast to those of Cassidulidae and Echinolampadidae. Ochetus differs from all other taxa included here in having double pores beneath the petals and is presumably the primitive sister group.