Aglaiocypris pellucida Mostafawi, 2003

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 : 126

Aglaiocypris pellucida Mostafawi, 2003

Fig. 5A–C

Aglaiocypris pellucida Mostafawi, 2003: 71 , figs 51a–c.

Aglaiocypris? sp. 5 – Maddocks 1969: 7, figs 31r–t.

Aglaiocypris sp. – Paik 1977: 28: 42, pl. 7 figs 3, 141–143, pl. 10 fig. 181.

Bythocypris sp. A . – Jain 1978: 94, fig. 2d.

Aglaiocypris pellucida – Wang et al. 2018: 324, figs 2l–o.

Dimensions

L = 0.542 –0.569 millimeters; H = 0.250 –0.275 millimeters; H/L = 0.45–0.49.

Distribution

Modern distribution: West coast of India, Recent ( Jain 1978); Persian Gulf, Recent ( Maddocks 1969; Paik 1977; Mostafawi 2003)

Fossil distribution: Hang Hau Formation, Lei Yue Mun, Hong Kong, Holocene ( Wang et al. 2018); Bangkok Clay (samples 20SS01A, 02A, 02B, 03A), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work, Fig. 4 ).

Remarks

Aglaiocypris pellucida Mostafawi, 2003 is diagnosed by the following characters: thin, flat and obtuse carapace with triangular lateral outline, largely rounded AB and PB, Hmax located centrally, DB convex at LV, slightly angulated at RV, moderate overlapping of RV on LV all around, VB straight at RV, concave at LV, numerous normal pores. The present record is the first occurrence of Aglaiocypris pellucida in Thailand as, until now, this species was only known from the Persian Gulf ( Maddocks 1969; Paik 1977; Mostafawi 2003), western coast of India ( Jain 1978) and in Holocene deposits of Hong Kong ( Wang et al. 2018). The size of the examined specimens is similar to the Holocene specimens recovered in Hong Kong ( Wang et al. 2018) but they are smaller than the extant type material from the Persian Gulf ( Mostafawi 2003).

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.