Pirenella incisa ( Hombron & Jacquinot, 1848 )

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

Pirenella incisa ( Hombron & Jacquinot, 1848)

Figs 3 I , 5 F

Cerithium incisum Hombron & Jacquinot, 1848: 97, pl. 23, figs 8, 9. Type locality: Borneo.

Cerithidea (Cerithideopsilla) djadjariensis [non Martin]. Sri-aroon et al. 2004: table 1, fig. 2 - 7.

Cerithideopsilla djadjariensis [non Martin]. Lozouet 2008: 284, pl. 87, fig. 9; pl. 88, fig. 2.

Pirenella incisa . Reid and Ozawa 2016: 30 – 32, figs 1, 2 g, h, 4 i, 10, 11 a. Zvonareva and Kantor 2016: 415 , fig. 5 a – d. BEDO 2017 b: 28, with in-text fig. Wells et al. 2021: 126.

Referred material.

CUF - NKNY - G 10 (47 shells; Figs 3 I , 5 F ).

Habitat.

On damp mud in mangrove forests. Also found on open surface areas of intertidal mudflats and on muddy shores of shrimp ponds ( Reid and Ozawa 2016; Zvonareva and Kantor 2016).

Distribution.

East India; Indo-West Pacific, from southern China, the Philippines to West Sulawesi, and Flores Island ( Reid and Ozawa 2016).

Record in Thailand.

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

Taxonomic remarks and comparisons.

This species differs from the other two similar species, Pirenella pupiformis Ozawa & Reid, 2016 and P. caiyingyai (Qian, Fang & He, 2013) , by the presence of an almost columnar appearance, a more oblique and more flared aperture with the projection of a lip next to a deep anterior canal, and three equal cords on each spire whorl with strong square nodules on axial ribs ( Reid and Ozawa 2016). See comprehensive taxonomic remarks in Reid and Ozawa (2016).

Telescopium Montfort, 1810

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.