Lutraria complanata ( Gmelin, 1791 )

Jirapatrasilp, Parin, Cuny, Gilles, Kocsis, László, Sutcharit, Chirasak, Ngamnisai, Nom, Charoentitirat, Thasinee, Kumpitak, Satapat & Suraprasit, Kantapon, 2024, Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand, ZooKeys 1202, pp. 1-110 : 1-110

Lutraria complanata ( Gmelin, 1791)

Figs 13 H , 15 C

Mactra complanata Gmelin, 1791: 3261. Type locality: the Indian Ocean.

Lutraria (Lutrophora) cf. complanata . Dheeradilok et al. 1984: pl. 2, fig. 5.

Lutraria complanata . Swennen et al. 2001: 47, 82, fig. 112. Hylleberg and Kilburn 2003: 186. Yang et al. 2017: 194, fig. 742. Wells et al. 2021: 40.

Lutraria (Lutrophora) complanata . Robba et al. 2002: 91, pl. 12, fig. 4. Robba et al. 2007: 86 (appendix). Huber 2010: 451, with in-text figs. Huber 2015: C 21984.

Lutraria (Goniomactra) complanata . Beu 2006: 242.

Lutraria (Lutropbora) complanata [sic]. Nabhitabhata 2009: 412.

Referred material.

CUF - NKNY - B 29 (1 L + 2 R shells; Figs 13 H , 15 C ).

Habitat.

Sandy and muddy sand in subtidal zones from a depth of 8–20 m ( Huber 2015).

Distribution.

Indian Ocean; Indo-West Pacific, from South China to Indonesia ( Huber 2015; Yang et al. 2017). Records of fossils from the Holocene in Thailand ( Robba et al. 2002).

Record in Thailand.

Gulf of Thailand ( Wells et al. 2021).

Taxonomic remarks and comparisons.

This species is recognised based on the descriptions and figures in Robba et al. (2002) and Huber (2010), specifically in having an elongate-elliptical and markedly inequilateral thin shell with arched anterior and posterior margins, and an outer surface sculptured with irregular crenulated growth lines.

Standella Gray, 1853

Figures

Figure 13. Size comparison of bivalves and other invertebrates found in this study A Placuna placenta B Standella pellucida C Geloina bengalensis D Anadara inaequivalvis E Pegophysema bialata F Megabalanus cf. tintinnabulum G Cultellus maximus H Lutraria complanata I Thalassina sp. J Tellinides conspicuus.

Figure 15. Bivalves A Pegophysema bialata B Geloina bengalensis C Lutraria complanata D Standella pellucida E Tellinides conspicuus F Joannisiella oblonga.