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).