Gyrostrea sp. A

(Fig. 3 A)

MATERIAL. — 1 specimen (MDG/LBV/Lm-13).

OCCURRENCE. — Turonian of Gabon (this study).

DESCRIPTION

Shell, represented by LV, is medium, inequilateral, elongated to elliptical shape in outline. Anterior and posterior margin are curved giving semicircular shape of shell. Attachment area is small. Surface rough with growth squamae and few rough rounded irregular ribs well separated from each other.

REMARKS

This species differs to Gyrostrea delettrei (Coquand, 1862) in having small irregular ribs.