Placamen lamellatum ( Röding, 1798 )

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

Placamen lamellatum ( Röding, 1798)

Figs 12 L , 16 C

Venus lamellata Röding, 1798: 183. Type locality: the East Indian Seas.

Venus tiara Dillwyn, 1817: 162. Type locality: the East Indian Seas.

Venus calophylla Philippi, 1836: 229 – 230, pl. 8, fig. 2 Type locality: the Chinese Sea.

Chione (Circomphalus) calophylla . Lynge 1909: 150 – 151.

Callanaitis calophylla . Tantanasiriwong 1979: 13. Nateewathana et al. 1981: 67.

Placamen tiara . Tantanasiriwong 1979: 13. Nateewathana et al. 1981: 67. Poutiers 1998 a: 351, with in-text figs. Aungtonya et al. 1999: 382. Hylleberg and Kilburn 2003: 219. Dharma 2005: 268, pl. 109, fig. 24. Thach 2005: 292. Dey and Ramakrishna 2007: 159, 238. Nabhitabhata 2009: 495. Poppe 2010 c: 274, pl. 1132, figs 1 – 3.

Bassina calophylla . Bosch et al. 1995: 266, fig. 1191. Subba Rao and Dey 2000: 284.

Placamen calophyllum . Kilburn and Hylleberg 1998: 315. Aungtonya et al. 1999: 382. Swennen et al. 2001: 48, 92, fig. 180. Robba et al. 2002: 107, pl. 17, fig. 4. Gemert 2003: 15. Hylleberg and Kilburn 2003: 218 – 219. Dharma 2005: 268, pl. 109, fig. 25. Thach 2005: 292, pl. 89, fig. 11. Robba et al. 2007: 87 (appendix). Meyer et al. 2008: tables 2, 4. Sartori et al. 2008: table 1. Nabhitabhata 2009: 494. Poppe 2010 c: 272, pl. 1131, figs 4 – 7. Sanpanich 2011: table 2.

Placamen lamellatum . Huber 2010: 369, with in-text figs. Huber 2015: C 18043. BEDO 2017 a: 287. Tudu et al. 2018: table 1. Wells et al. 2021: 48.

Clausinella calophylla . Yang et al. 2017: 222, 224, fig. 834.

Clausinella tiara . Yang et al. 2017: 224, fig. 836.

Referred material.

CUF - NKNY - B 28 (1 R shell; Figs 12 L , 16 C ).

Habitat.

Muddy sand, sand, and shell gravels from intertidal zones down to 100 m depth ( Bosch et al. 1995; Robba et al. 2002; Yang et al. 2017).

Distribution.

Arabian Gulf and Indian Ocean; Indo-West Pacific, from Japan to Indonesia ( Bosch et al. 1995; Huber 2015; Yang et al. 2017). Records of fossils from the Late Neogene to Holocene in Fiji, India, Indonesia, Japan, the Philippines and Taiwan ( Robba et al. 2002).

Record in Thailand.

Gulf of Thailand and Andaman Sea ( Wells et al. 2021).

Taxonomic remarks and comparisons.

This species differs from its similar species, Placamen chloroticum (Philippi, 1849) , by having a somewhat shallower and trigonal pallial sinus as well as more widely spaced and more raised commarginal lamellae ( Robba et al. 2002).

Order Myida Stoliczka, 1870

Superfamily Myoidea Lamarck, 1809

Figures

Figure 12. Size comparison of bivalves, scaphopod and other invertebrates found in this study A Tegillarca nodifera B Volachlamys singaporina C Tegillarca granosa D Noetiella pectunculiformis E Magallana cf. gigas F Estellacar olivacea G Anadara indica H Dentalium variabile I Siliqua minima J Corbula fortisulcata K Fistulobalanus kondakovi L Placamen lamellatum M Martesia striata N Potamocorbula sp. O Jupiteria puellata P Saccella mauritiana Q Paratapes undulatus R Dosinia dilecta S Joannisiella oblonga T Temnotrema siamense U Pholas orientalis.

Figure 16. Bivalves A Dosinia dilecta B Paratapes undulatus C Placamen lamellatum D Corbula fortisulcata E Potamocorbula sp. F, G Martesia striata G showing the shells with burrow casts along with mangrove roots H Pholas orientalis I calcareous burrows of Teredinidae indet.