Propontocypris clara Zhao, 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 : 127-129

Propontocypris clara Zhao, 1988

Fig. 5G–H

Propontocypris clara Zhao in Wang et al. 1988: 230, pl. 36 figs 3–5.

Propontocypris clara – Ruan 1989: 118, pl. 20 fig. 24. — Tanaka et al. 2009: pl. 1 fig. 1. — Wang et al. 2018: 326, fig. 3a–d.

Dimensions

L = 0.38–0.493 millimeters; H = 0.213 –0.246 millimeters; H/L = 0.44–0.51.

Distribution

Modern distribution: East China Sea ( Wang et al. 1988); Northern Xisha Trench, South China Sea, China ( Ruan 1989); Northeastern coast of Vietnam, Vietnam ( Tanaka et al. 2009).

Fossil distribution: Hang Hau Formation, Lei Yue Mun, Hong Kong, Holocene ( Wang et al. 2018); Bangkok Clay (samples 20SS01A, 02A, 02B, 04B), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work, Fig. 4 ).

Remarks

Propontocypris clara Zhao, 1988 is characterized by its small and delicate carapace, subtriangular in lateral view, with Hmax located in front of midL, rounded AB, slightly concave VB, narrowly rounded PB, round normal pores. Propontocypris clara is distinguished from P. bengalensis by the location of Hmax. The examined specimens are smaller than those reported from Holocene sediments of Hong Kong (L = 0.497 –0.526 millimeters; H = 0.280 –0.274 millimeters; Wang et al. 2018).

Figures

Fig. 5. Holocene ostracods from Samut Sakhon Province, Central Thailand.A–C. Aglaiocypris pellucida Mostafawi, 2003. A. Carapace, right lateral view, SUT-20SS-C003. B. Carapace, left lateral view, SUT-20SS-C007. C. Carapace, left lateral view, SUT-20SS-C003. – D–H. Propontocypris bengalensis Maddocks, 1969. D. Carapace, left lateral view, SUT-20SS-C012. E. Carapace, left lateral view, SUT- 20SS-C020. F. Carapace, left lateral view, SUT-20SS-C014. G. Carapace, right lateral view, SUT- 20SS-C027. H. Carapace, left lateral view, SUT-20SS-C022. – I–O. Sinocytheridea impressa (Brady, 1869). I. Carapace, female, right lateral view, SUT-20SS-C063. J. Carapace, male, right lateral view, SUT-20SS-C040. K. Internal view of right valve, male, SUT-20SS-C049. L. Carapace, female, left lateral view, SUT-20SS-C071. M. Carapace, male, left lateral view, SUT-20SS-C071. N. Internal view of left valve, male, SUT-20SS-C048. O. Internal view of left valve, female, SUT-20SS-C064. 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.