Neomonoceratina mediterranea mediterranea (Ruggieri, 1953)

Fig. 6K–N

Paijenborchella (Neomonoceratina) mediterranea Ruggieri, 1953: 4–7, figs 1–5.

Paijenborchella (Neomonoceratina) mediterranea – Keij 1954: 288, pl. 5 fig. 15, pl. 16 fig. 12, 361, pl. 3 figs 12–13. — Morales 1966: 80, pl. 7 fig. 2a–c.

Neomonoceratina sp. Swain 1955: 643, pl. 64 fig. 14.

Neomonoceratina mediterranea – Morkhoven Van 1963: 369, fig. 604. — Teeter 1975: 473, fig. 17k. — Gou et al. 1981: 171, pl. 82 figs 11–12. — Hou et al. 1982: 219, pl. 80 figs 24–30. — McKenzie & Pickett 1984: fig. 4y–z.

Neomonoceratina mediterranea mediterranea – Zhao & Whatley 1988: 565, pl. 1 figs 2–3.

Neomonoceratina sp. (pars) – Forel 2021: 7, fig. 4g –h

Dimensions

L = 0.400 –0.778 millimeters; H = 0.206 –0.467 millimeters; H/L = 0.46–0.60.

Distribution

Modern distribution: Southwestern coast of Peninsular Thailand, Ao Nun, Satun Province, Andaman Sea (Forel 2021).

Fossil distribution: Pliocene of southeast China, Quaternary of east China, East of Australia, Recent of Eastern Mediterranean, the Philippines, Indonesia, Australia, the Caribbean and Gulf of Mexico (see details in Zhao & Whatley 1989); Bangkok Clay (samples 20SS01A, 01B, 02A, 02B, 03A, 04A, 04B), whale excavation site, Samut Sakhon Province, Thailand, Late Holocene (this work, Fig. 4).

Remarks

Neomonoceratina mediterranea mediterranea (Ruggieri, 1953) is recognized by its small carapace with two short oblique posterodorsal ribs, a long median rib, one venterolateral rib and one ventral rib. The posterodorsal and venterrodorsal ribs connect with median rib in the posterior area. The carapace surface is finely punctate. Two of the three specimens identified as Neomonoceratina sp. in Forel (2021) are here re-attributed to N. mediterranea mediterranea (Forel 2021: fig. 4g –h).