The Echinoid Directory

Basseaster Lambert, 1936, p. 23

Diagnostic Features
  • Test thin-plated; ovate with shallow anterior sulcus; posterior face with slight subanal heel.
  • Apical disc with four gonopores; anterior genital plates not fused. Posterior ocular plates disjunct and separated from the posterior genital plates.
  • Ambulacra all similar; flush; pore-pairs rudimentary; apetaloid.
  • Peristome circular and moderately far removed from the anterior border; not depressed.
  • Plastron plating orthosternous with labral plate followed by a single large sternal plate then a pair of small, near symmetical episternal plates. No rostral plate.
  • Periproct on steeply sloping posterior face; ovate.
  • Aboral tuberculation fine.
  • Subanal fasciole present.
Late Cretaceous (Maastrichtian) to early Tertiary (Danian) of Madagascar and Dagestan.
Name gender masculine
Basseaster rostratus Lambert, 1936, p. 25, by original designation. Holotype: Museum National d'Histoire Naturelle, Paris J00920.
Species Included
  • Only the type species
Classification and/or Status

Holasteroida, Meridosternata, Urechinina stem-group.



Most similar to Garumnaster, but distinguished from that taxon by having four gonopores and a shallow frontal groove. Galeaster has a deeper frontal groove, fused anterior genital plates and elongate episternal plates.

Smith, A. B. & Jeffery, C. H. 2000. Maastrichtian and Palaeocene echinoids: a key to world faunas. Special Papers in Palaeontology 63, 1-404.