The Echinoid Directory

Craginaster Lambert, 1903, p. 219

Diagnostic Features
  • Test ovate with flat base, domal upper surface and no anterior sulcus.
  • Apical disc subcentral with four gonopores. Hydropores extend over all anterior ocular and genital plates.
  • All ambulacra identical with elongate and conjugate pore-pairs adapically; subpetaloid.
  • Plastron plating meridosternous with plating biserial behind the sternal plate.
  • Peristome ovate; facing downwards; oral region slightly depressed - not connected to the anterior by a sulcus.
  • Periproct inframarginal on short trucate posterior face.
  • Aboral tuberculation uniform and fine.
  • No fascioles.
Distribution
Lower Cretaceous (Upper Albian), USA.
Name gender masculine
Type
Holaster completus Cragin, 1893, p. 155, by original designation.
Species Included
  • Only the type species.
Classification and/or Status

Holasteroida, Meridosternata, Echinocorythidae.

Junior subjective synonym of Pseudananchys Pomel, 1883.

Remarks
Very similar to Echinocorys Leske, 1778, but having a higher, more marginal periproct and better developed petals that are close-packed and not circumflexed. Similar to Holaster in test plating and tuberculation, differing in having no anterior sulcus. Easily distinguished from both by having subpetaloid anterior ambulacrum.

Lambert, J. 1903. [Review of Cragin]. Revue critique de Paleozoologie 7, p. 219.