Neomonoceratina columbiformis Kingma, 1948

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 : 131-133

Neomonoceratina columbiformis Kingma, 1948

Fig. 6J

Neomonoceratina columbiformis – Kingma 1948: 95, pl. 10 fig. 8a–f.

Neomonoceratina columbiformis – Keij 1979: 61, pl. 1 figs 1–4, pl. 2 figs 5–6. — Zhao & Whatley 1988: 565, pl. 1 fig. 1.

non Neomonoceratina columbiformis – Keij 1979: 166, pl. 1 fig. 11.

Dimensions

L = 0.440 millimeters, H = 0.240 millimeters, H/L = 0.55.

Distribution

Modern distribution: Malacca Strait ( Zhao & Whatley 1988); Jakarta Bay, Indonesia ( Fauzielly et al. 2013); Klong Thom, Krabi, Andaman estuary, Thailand ( Yamada et al. 2014).

Fossil distribution: Pliocene, Sumatra ( Kingma 1948; Keij 1979); Bangkok Clay (sample 20SS04A), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work).

Remark

Neomonoceratina columbiformis Kingma, 1948 is very rare in our material but it can be recognized by its non-ornamented carapace with curved posterodorsal rib and oblique median rib.

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.