Cerithidea obtusa ( Lamarck, 1822 )

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

Cerithidea obtusa ( Lamarck, 1822)

Figs 3 M , 5 E

Cerithium obtusum Lamarck, 1822: 71. Type locality: Timor.

Cerithidea obtusa . Cernohorsky 1972: 60 (in part). Tantanasiriwong 1978: 7, fig. 70. Nateewathana et al. 1981: 57. Way and Purchon 1981: 315. Nateewathana 1995: 97, with in-text fig. Poutiers 1998 b: 450, with in-text figs. Gemert 2003: 104. Hylleberg and Kilburn 2003: 37 – 38. Robba et al. 2004: 31 – 32, pl. 3, fig. 4 a, b. Dharma 2005: 92, pl. 21, fig. 8; 308, pl. 119, fig. 8 a, b. Thach 2005: 49, pl. 10, fig. 4. Dey 2006: 35 – 36, figs 38 – 40. Robba et al. 2007: 89 (appendix). Printrakoon et al. 2008: table 1. Kesavan et al. 2009: 382, with in-text fig. Hamli et al. 2013: tables 2, 3, fig. 2 a. Dechruksa et al. 2014: fig. 2 f. Reid 2014: 27 – 29, 31, figs 2 b, 8, 9. BEDO 2017 b: 26, with in-text fig. Tudu et al. 2018: table 1. Wells et al. 2021: 125 – 126.

Cerithidea (Cerithidea) obtusa . Brandt 1974: 192 – 193, pl. 14, fig. 52. Houbrick 1984: 15 – 16, fig. 5 c. Sri-aroon et al. 2004: table 1, fig. 3 - 1. Sri-aroon et al. 2005: tables 2 – 6. Ramakrishna et al. 2007: 6, 47. Nabhitabhata 2009: 95.

Referred material.

CUF - NKNY - G 14 (23 shells; Figs 3 M , 5 E ).

Habitat.

On firm mud and on trunks and stilt roots in mangrove forests as well as in fully marine and estuarine areas ( Reid 2014).

Distribution.

Bay of Bengal; Indo-West Pacific, from southern Vietnam to Java and East Borneo ( Reid 2014). Records of fossils from the Late Pliocene in Central and West Java, Indonesia, and from the Holocene in Thailand ( Robba et al. 2004; Dharma 2005).

Record in Thailand.

Chanthaburi River, Gulf of Thailand and Andaman Sea ( Nabhitabhata 2009; Wells et al. 2021).

Taxonomic remarks and comparisons.

This species has a more thickened and flared aperture compared to two similar species, Cerithidea anticipata Iredale, 1929 and C. reidi Houbrick, 1986 . These two species are also common in Sahul (New Guinea and Australia), whereas C. obtusa is present in Sunda ( Reid 2014). See also comprehensive taxonomic remarks in Reid (2014).

Pirenella Gray, 1847

Figures

Figure 3. Size comparison of coral and gastropods found in this study A Oulangia cf. stokesiana B Neripteron violaceum C Nerita articulata D Natica stellata E Natica vitellus F Homalopoma cf. sangarense G Eunaticina papilla H Ergaea walshi I Pirenella incisa J Scalptia scalariformis K Telescopium telescopium L Merica elegans M Cerithidea obtusa N Bufonaria rana O Nassarius micans P Nassarius siquijorensis Q Paratectonatica tigrina.

Figure 5. Coral and gastropods A Oulangia cf. stokesiana B Homalopoma cf. sangarense C Neripteron violaceum D Nerita articulata E Cerithidea obtusa F Pirenella incisa G Telescopium telescopium.