Neomonoceratina mediterranea malayensis Zhao & Whatley, 1988

Chitnarin, Anisong, Forel, Marie-Béatrice & Tepnarong, Prachya, 2023, Holocene ostracods (Crustacea) from a whale-fall excavation site from the Chao Phraya delta, Central Thailand, European Journal of Taxonomy 856 (1), pp. 120-151 : 134

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).

Figures

Fig. 6. Holocene ostracods from Samut Sakhon Province, Central Thailand. A–C. Neomonoceratina iniqua (Brady, 1868). A. Valve, male, right lateral view, SUT-20SS-C097. B. Valve, male, left lateral view, SUT- 20SS-C095.C.Valve,male,rightlateralview, SUT-20SS-C093.–D–I.Neomonoceratinarhomboidei(Brady, 1968). D. Carapace, male, right lateral view, SUT-20SS-C113. E. Carapace, male, right lateral view, SUT- 20SS-C120. F. Carapace, female, right lateral view, SUT-20SS-C099.G. Carapace, female, left lateral view, SUT-20SS-C107. H. Carapace, female, dorsal view, SUT-20SS-C114.I. Sieve pores. –J. Neomonoceratina columbiformis Kingma, 1948. Carapace, left lateral view, SUT-20SS-C181. – K–N. Neomonoceratina mediterranea mediterranea (Ruggieri, 1953). K. Carapace, female, right lateral view, SUT-20SS-C167. L. Carapace, female, right lateral view, SUT-20SS-C173. M. Carapace, female, left lateral view, SUT- 20SS-C164. N. Carapace, female, dorsal view, SUT-20SS-C174. – O–T. Neomonoceratina mediterranea malayensis Zhao & Whatley, 1988. O. Carapace, male, right lateral view, SUT-20SS-C159. P. Carapace, male, left lateral view, SUT-20SS-C157. Q. Carapace, male, dorsal view, SUT-20SS-C161. R. Carapace, male, left lateral view, SUT-20SS-C152. S. Carapace, male, left lateral view, SUT-20SS-C141. T. Valve, male, internal view of left valve, SUT-20SS-C160. Scale bars = 1 mm.

Fig. 4. Distribution of Holocene ostracods below and above the whale skeleton level at the whale-fall excavation site in Samut Sakhon Province, north of Gulf of Thailand.