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Pygaster gressleyi Desor, 1842, p. 80

Distribution	Upper Jurassic (Kimmeridgian), western Europe.
Classification and/or Status	A species of Pygaster:
Remarks	Close to P. semisulcatus (Phillips, 1829) in the shape of its periproctal opening but much more rounded in profile. Desor, E. 1842 Des Galerites. Monographies d'Echinodermes. H. Nicolet, Neuchatel. Saemann & Dolfus. Bulletin de la Societe geologique de France serie 2, 19, p. 170, pl. 3, fig. 1.