Neomonoceratina mediterranea malayensis Zhao & Whatley, 1988

Fig. 6O–T

Neomonoceratina mediterranea malayensis Zhao & Whatley, 1988: 566, pl 1 figs 4–6.

Neomonoceratina sp. – Forel 2021: 7, fig. 4f.

Dimensions

L = 0.433 –0.480 millimeters; H = 0.187 –0.213 millimeters; H/L = 0.39–0.47.

Distribution

Recent distribution: Jason Bay, southeastern Malay Peninsula, Malaysia (Zhao & Whatley 1989); Southwestern coast of Peninsular Thailand, Ao Nun, Satun Province, Andaman Sea (Forel 2021).

Fossil distribution: Bangkok Clay (samples 20SS01A, 01B, 02A, 02B, 03A, 04A, 04B), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work, Fig. 4).

Remarks

The size and H/L ratio of N. mediterranea malayensis are smaller than those of N. mediterranea mediterranea . Punctae on the surface are restricted to the base of the ribs while they are rare on the smooth intercostal surface. Neomonoceratina mediterranea malayensis was first recovered from shallow water sediments of the Jason Bay, in Malay Peninsula (Zhao & Whatley 1988). This species was also found along the Andaman coast of Thailand (Forel 2021: fig. 4f).