The Echinoid Directory

Contributed by Jenna Sullivan, March 2007

Primipygus Vadet, 2007, p. 192

Diagnostic Features	Test flattened Apical apical central, the madreporite occupies the majority of the apical disc The distance from the apical disc to the periproct is very short and increases very little during growth.
Distribution	Upper Bajocian, Middle Jurrasic of Cheltenham, England, and Boulonnais, France.
Name gender	masculine
Type	Nucleolites richardsoni Talbot Paris, in Richardson & Talbot Paris, 1908, by original designation. Natural History Museum Holotype E 11889
Species Included	Only the type species.
Classification and/or Status	Irregularia, cassiduloid, nucleolitid Subjective junior synonym of Pseudosorella Etallon, 1859, p. 415; objective junior synonym of Notopygus Pomel, 1883.
Remarks	Vadet, A. 2007. Echinides fossiles du Boulonnais: Du Bajocien au Tithonien. Les Irreguliers. Annales de la Societe d'Histoire Naturelle du Boulonnais. 5(2): 158-220.