The Echinoid Directory

Contributed by Andrew Smith, December 2006

Ancylocidaris Miller, 1929, p. 334

Diagnostic Features	Test depressed with rounded ambitus Apical disc plating missing Ambulacra with simple plating at the ambitus and aborally, with pore-pairs uniserially arranged Interambulacral plates wide and geniculate.
Distribution	Sundance Formation, Upper Jurassic, Wyoming, USA
Name gender	feminine
Type	Type species Ancylocidaris spenceri Miller, p. 335, by monotypy. Only known specimen stated to be in Tulane University Paleontological collections.
Species Included	Only the type species.
Classification and/or Status	Indeterminate.
Remarks	The unique specimen is preserved in crystalline calcite and shows no surface details. Miller, A. K. 1929. Ancylocidaris, a new echinoid genus from the Sundance of West-Central Wyoming. American Journal of Science (5) 18: 334-336.