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Species / Diameza Intermedia


Description: (from Jung, 1974) Shell small, inflated, involute. Line of greatest diameter situated a little above the middle of the height of the shell. (average size 7 mm, note of editor) Surface smooth except for indistinct growth lines and a few faint, oblique grooves near the base of he columella. Parietal callus only weakly developed. Outer lip somewhat thickened and sinuous, prosocyrth on lower part and opistocyrth on upper part of the shell. The outer lip extends above the apex, were it forms a pointed structure which is hiding the actual apex. Stromboid notch rudimentary. Columella slightly bent backwards near base.

Locus typicus: Grignon near Paris, France

Stratum typicum: Lutetian, middle Eocene

History and Synonymy


Ovula intermedia Deshayes, 1824-1837. Descriptions des coquilles fossiles des environs de Paris, vol.2, p.718, pl.95, fig. 34-35-36


Ovula media Deshayes, 1864-1865. Description des animaux sans vertebres decouverts dans le bassin de Paris, vol,3, p.572. New name for Ovula intermedia


Diameza media Cossmann, 1889, pl. III, fig. 16

  • Ferme de l'Orme, Yvelines Department, France


Terebellum (Diameza) medium in Cossmann, 1904, pl. III, fig. 9 - 12

Specimens from private collections

Diameza media; Departement Yvelines, France; Lutetian, Eocene, Paleogene; t: 8 mm, b: 10 mm; Coll. Christian Romanek


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