Stigmatocythere bona Chen, 1982

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

Stigmatocythere bona Chen, 1982

Fig. 7G–I

Stigmatocythere bona Chen in Hou et al., 1982: figs 153–154.

Stigmatocythere bona – Whatley & Zhao 1988b: 9, pl. 6 fig. 19. — Dewi 1993: 69, figs 153–154. — Montenegro et al. 2004: pl. 2 fig. 8. — Forel 2021: 8, fig. 5d–e.

Dimensions

L = 0.407 –0.678 millimeters, H = 0.221 –0.360 millimeters, H/L = 0.41–0.58.

Distribution

Modern distribution: Java Sea ( Dewi 1993, 2000); Malacca Straits ( Whatley & Zhao 1988); Sedili River, Jason Bay ( Zhao & Whatley 1989); Vietnam ( Tan et al. 2021); Sri Lanka ( Iwatani et al. 2014); Mae Khlong River mouth, north west Gulf of Thailand ( Montenegro et al. 2004); Southwestern coast of Peninsular Thailand, Ao Nun, Satun Province, Andaman Sea ( Forel 2021).

Fossil distribution: East China, Pliocene and Quaternary ( Hou et al. 1982; Gou et al. 1983); Bangkok Clay (samples 20SS01A, 02B, 03A), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work, Fig. 4 ).

Figures

Fig. 7. Holocene ostracods from Samut Sakhon Province, Central Thailand. A–E. Keijella gonia Zhao & Whatley, 1989. A. Carapace, left lateral view, SUT-20SS-C310. B. Carapace, left lateral view, SUT-20SS-C311. C. Carapace, left lateral view, SUT-20SS-C312. D. Carapace, right lateral view, SUT- 20SS-C288. E. Carapace, right lateral view, SUT-20SS-C286. – F. Pistocythereis sp. Carapace, right lateral view, SUT-20SS-C305. –G–I. Stigmatocythere bona Chen in Hou, Chen, Yang, Ho, Zhou & Tian, 1982. G. Carapace, right lateral view, SUT-20SS-C201. H. Carapace, left lateral view, SUT-20SS-C200. I. Valve, internal view of right valve, SUT-20SS-C190. – J–O. Keijella multisulcus Whatley & Zhao, 1988. J. Valve, juvenile, right lateral view, SUT-20SS-C231. K. Valve, juvenile, internal view of right valve, SUT-20SS-C213. L. Carapace, male, left lateral view, SUT-20SS-C225. M. Carapace, female, left lateral view, SUT-20SS-C242.N. Carapace, female, left lateral view, SUT-20SS-C206. O. Carapace, female, left lateral view, SUT-20SS-C243. Scale bars = 0.1. 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.