Neomonoceratina rhomboidea (Brady, 1968)

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 : 131

Neomonoceratina rhomboidea (Brady, 1968)

Fig. 6D–I

Cytheropteron rhomboideum Brady 1968: 65 , pl. 8 figs 10–12.

Neomonoceratina rhomboidea – Hanai et al. 1980: 154. — Zhao & Whatley 1988: 569, pl. I figs 20–21, pl. II figs 1–3.

Dimensions

L = 0.400 –0.778 millimeters, H = 0.206 –0.467 millimeters, H/L = 0.40–0.67.

Distribution

Modern distribution: Batavia, Java, Indonesia (Brady 1968); Jason Bay, southeast Malaysia ( Zhao & Whatley 1988).

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

Remark

Neomonoceratina rhomboidea (Brady, 1968) can be recognized by the inflated carapace, a weak and shallow reticulation, a thin median rib and alalike posteroventral inflation and relatively large, sieve type, normal pore canals.

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.