The Echinoid Directory

Family Brissidae Gray, 1855, p. 49


 Micrasterine spatangoids with:

  • ethmolytic apical disc with genital plate 2 extending behind the posterior ocular plates
  • labral plate short and wide, not in contact with ambulacral plate 2
  • episternal plates tapering posteriorly
  • petals narrow and parallel-sided, without wide perradial zone; generally sunken
  • peripetalous and subanal fascioles present.
Eocene to Recent; worldwide.
Distinguished from other Micrasterina by the short and wide labral plate that does not extend beyond the first ambulacral plate and by its relatively narrow and parallel-sided petals.

The following taxon is most probably a brissid but is not included in the key: