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The Echinoid Directory

Contributed by Andrew Smith, October 2007

Ganbirretia Gauthier, 1903, p. 19

Diagnostic Features
  • Test ovate without frontal sulcus. Upper surface convex, lower face flat.
  • Test plating thin and fragile.
  • Apical disc plating holasterid with four gonopores
  • Ambulacra composed of rather tall, hexagonal plates aborally; pore-pairs small and undifferentiated; apetaloid; placed in the centre of plates.
  • Plastron plating and peristome unknown.
  • Periproct position unknown; presumed posterior.
  • Major tubercles scattered over the aboral face, set in a groundmass of fine granules.
  • No marginal fasciole; unknown whether subanal fasciole is present.
Distribution Early Palaeocene, Gan, France.
Name gender feminine
Type Ganbirretia douvillei Gauthier, 1903, p. 20, by original designation.
Species Included Only the type species.
Classification and/or Status Holasteroida; ?Urechinina, family indeterminate.

Monotypic.
Remarks Too poorly known to be able to classify with any degree of confidence, but with overall resemblance to the Urechinina. Differs from Garumnaster, which is found from the same horizon and general region, primarily in size and by its coarser aboral tuberculation.

Gauthier, V. 1903. Contribution a l'etude des echinides fossiles. VII Genre Ganbirretia Gauthier, 1903. Bulletin de la Societe geologique de France Series 4 3, 19-29.