Neripteron violaceum ( 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

Neripteron violaceum ( Gmelin, 1791)

Figs 3 B , 5 C

Nerita violacea Gmelin, 1791: 3686. Type locality: unknown.

Neritina violacea . Tantanasiriwong 1978: 6, fig. 52. Nateewathana et al. 1981: 56. Wilson 1993: 41, pl. 2, figs 18 a, b, 19 a – d. Hylleberg and Kilburn 2003: 31. Robba et al. 2004: 24 – 25, pl. 2, fig. 5 a, b. Robba et al. 2007: 89 (appendix). Printrakoon et al. 2008: table 1. Tan and Clements 2008: 490 – 491, fig. 3 - 33, 3 - 34. Nabhitabhata 2009: 39. Sanpanich and Duangdee 2013: 53. Ng et al. 2016: fig. 1 - 28. Yang et al. 2017: 20, fig. 75. Tudu et al. 2018: table 1.

Dostia violacea . Way and Purchon 1981: 314. Subba Rao and Dey 2000: 35. Sri-aroon et al. 2004: table 1, fig. 2 - 1. Dechruksa et al. 2014: fig. 2 k.

Neripteron violacea . Swennen et al. 2001: 52, 108, text-fig. 275, fig. 275.

Neritina (Dostia) violacea . Gemert 2003: 103. Sri-aroon et al. 2005: tables 2, 3, 5, 6. Dey 2006: 22, figs 11, 12. Ramakrishna et al. 2007: 5, 37. Kesavan et al. 2009: 382, with in-text fig. Eichhorst 2016: 392 – 395, pl. 102, figs 1 – 15.

Neritina (Neripteron) violacea . Thach 2005: 38, pl. 6, figs 8, 9.

Neripteron violaceus . Eichhorst 2008: 268, pl. 79, fig. 7 a, b.

Neripteron violaceum . Baharuddin et al. 2017: fig. 3 o. BEDO 2017 b: 97, with in-text fig. Kantharajan et al. 2017: table 1, fig. 4 - 34. Yadav et al. 2019: table 2, fig. 1 h. Mustapha et al. 2021: 52 – 53, figs 3 e, f, 4 i. Wells et al. 2021: 154 – 155.

Referred material.

CUF - NKNY - G 26 (28 shells; Figs 3 B , 5 C ).

Habitat.

On Nipa palms, muddy surfaces, old wood and rocks in brackish habitats and mangrove forests ( Swennen et al. 2001; Mustapha et al. 2021) as well as on gravels in high tidal zones ( Yang et al. 2017).

Distribution.

India ( Kantharajan et al. 2017; Yadav et al. 2019); Indo-West Pacific, from Japan to Australia ( Wilson 1993; Yang et al. 2017).

Record in Thailand.

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

Taxonomic remarks and comparisons.

The shell of N. violaceum is highly similar to that of N. cornucopia (Benson, 1836) but differs in having a purple to orangish red ventral side, and denticulations along the columellar edge often only present in the central part ( Huang 1997; Tan and Clements 2008). Although the columella edge of the specimens is corroded, there are still some traces of purple colour at the ventral side. Therefore, these specimens are identified as belonging to N. violaceum .

Nerita Linnaeus, 1758

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.