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The Echinoid Directory

Contributed by Andrew Smith, August 2011

Hexagramma Pomel, 1883, p. 104

Diagnostic Features
  • Differs from Tetragramma by having enlarged interambulacra with 6 columns of tubercles; equal at the ambitus but with the two flanking columns becoming much smaller towards the apex (Pomel, 1883)
Distribution Kimmeridgian, Upper Jurassic, France, Switzerland
Name gender neuter
Type Tetragramma planissimum Agassiz, 1840, p. 26 by monotypy.
Species Included Only the type species.
Classification and/or Status Phymosomatoida, Emiratiidae, Diplopodinae

Subjective junior synonym of Tetragramma.
Remarks Pomel, M. A. 1883. Classification methodique et genera des echinides vivants et fossiles. Theses a la Faculte des Sciences de Paris. Alger, Paris.