Pycnodonte sp., Fischer de Waldheim, 1835

Musavu Moussavou, Benjamin, 2017, Systematics, palaeoecology and taphonomy of Turonian oysters from the northern Gabon Coastal Basin, Geodiversitas 39 (2), pp. 213-224 : 218

Pycnodonte sp.

( Fig. 3 O, P)

MATERIAL. — 1 specimen (MDG/LBV/Lm-10).

OCCURRENCE. — Turonian of Gabon (this study).

DESCRIPTION

Shell, represented only by one left valve, is large, suborbicular in outline. Umbo is small. Anterior margin is curved into approximately semicircular shape. Posterior margin is straight, curving into ventral margin which is evenly rounded. Attachment area is very large (25 mm in diameter). Surface ornament consists of growth lamellae.

REMARKS

Because of the poor preservation and the small number of specimens, a species designation is not possible; however, the outline and ornamentation seem to show affinity with Pycnodonta vesicularis (Lamark, 1806).

Figures

FIG. 3. — A, Gyrostrea A MDG/LBV/Lm-13;B, C, Rhynchostreon cf.suborbiculatum (Lamarck,1801) MDG/LBV/Lm-9;D-F, Gryphaeostrea sp.;D-E, MDG/LBV/Lm- 7.1, F. MDG/LBV/Lm-7.2; G, H, Curvostrea tevesthensis (Coquand,1862) MDG/LBV/Lm-11;I-M, Ilymatogyra (Afrogyra) africana (Lamarck, 1801); I, J, MDG/LBV/ Lm-8.3,K.MDG/LBV/Lm-8.2,L-M.MDG/LBV/Lm-8.1;N, Q, Ostreidea gen.et sp.;indet MDG/LBV/Lm-34;O,P.Pycnodonte sp.MDG/LBV/Lm-10.Scale bar:1 cm.