Curvostrea tevesthensis ( Coquand, 1862 )

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

Curvostrea tevesthensis ( Coquand, 1862)

( Fig. 3 G, H)

Ostrea tevesthensis Coquand, 1862: 227, pl. 19, figs 7-13. — Basse 1932: 6.

Liostrea tevesthensis – Pervinquière 1912: 69.

Curvostrea tevesthensis – Malchus 1990: 156. — Cooper 2002: 36, fig-text. 5.

MATERIAL. — 1 specimen (MDG/LBV/Lm-11).

OCCURRENCE. — Cretaceous of North Africa ( Pervinquière 1912; Malchus 1990), Southeast Africa ( Cooper 2002). In Gabon, this species is recorded for the first time.

DESCRIPTION

S hell is large, inequival, inequilateral, elongated to oval in outline. LV is strongly convex, inflated. RV is only slightly convex. LV beak is opisthogyrally spiral. Anterior margin of LV is spirally curved. Its posterior margin is straight, curving into ventral margin which evenly rounded. Attachment area is small. LV ornamentation consists of commarginal growth striae and rugae separated by wide interspaces. RV is ornamented by concentric fine growth squamae.

REMARK

Curvostrea rouvillei ( Coquand, 1862) differs from the present material in being broader and more curved. Curvostrea bourguignati ( Coquand, 1869) is more quadrate.

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.