Ostrea sp. C

Musavu Moussavou, Benjamin, 2017, Systematics, palaeoecology and taphonomy of Turonian oysters from the northern Gabon Coastal Basin, Geodiversitas 39 (2), pp. 213-224 : 220

Ostrea sp. C

( Fig. 4 E)

MATERIAL. — 3 specimens (MDG/LBV/Lm-32.1 to Lm-32.3).

OCCURRENCE. — Turonian of Gabon (this study).

DESCRIPTION

Shell, represented only by one LV, is medium, inequilateral, elongated to elliptical shape in outline. Umbo is small and opisthogyrate. Ligamental area is larger than high. Anterior margin and posterior margin are subparallel Ventral margin is evenly rounded. Attachment area is long and suboval occupies the posterodorsal part of valve. Ornamentation consists of numerous radial ribs which interrupted by free standing frilled delicate growth squamae.

REMARKS

This species differs from Ostrea sp. B , in having a long and suboval attachment area and large ligamental area.

Figures

FIG. 4. — A-D, Ostrea sp. D: A, B, MDG/LBV/Lm-33.1; C, D, MDG/LBV/Lm-33.2; E, Ostrea sp. C MDG/LBV/Lm-32.1; F, Gyrostrea sp. B MDG/LBV/Lm-14; G-N, Gyrostrea delettrei (Coquand,1862);G, H, MDG/LBV/Lm-12.1;I, J, MDG/LBV/Lm-12.2;K, L, MDG/LBV/Lm-12.3,M-N.MDG/LBV/Lm-12.4;O-R, Ostrea sp.B;O, P, MDG/LBV/Lm-31.1;Q, R, MDG/LBV/Lm-31.2;S-U, Ostrea sp.A,S-T.MDG/LBV/Lm-15.1;U, MDG/LBV/Lm-15.2.Scale bar:1 cm.