Contributed by Andrew Smith, December 2006
|Distribution||Sundance Formation, Upper Jurassic, Wyoming, USA|
|Type||Type species Ancyclocidaris 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. Ancyclocidaris, a new echinoid genus from the Sundance of West-Central Wyoming. American Journal of Science (5) 18: 334-336.