Ergaea walshi ( Reeve, 1859 )

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

Ergaea walshi ( Reeve, 1859)

Figs 3 H , 6 E

Crepidula walshi Reeve, 1859: Crepidula, pl. 3, sp. 17. Type locality: Singapore; Ceylon [ Sri Lanka]. Tantanasiriwong 1978: 9. Bosch et al. 1995: 69, fig. 230. Subba Rao and Dey 2000: 64. Swennen et al. 2001: 54, 117, text-fig. 344, fig. 344. Gemert 2003: 104. Robba et al. 2003: tables 3 – 5. Robba et al. 2004: 66 – 67, pl. 8, fig. 8 a, b. Ramakrishna et al. 2007: 7, 55 – 56. Robba et al. 2007: 91 (appendix).

Ergaea walshi . Nateewathana et al. 1981: 57. Nabhitabhata 2009: 109. Low and Tan 2014: 11 – 13, fig. 1. BEDO 2017 b: 117, with in-text fig. Tudu et al. 2018: table 1. Wells et al. 2021: 75.

Crepidula walshii [sic]. Way and Purchon 1981: 316.

Siphopatella walshi . Hylleberg and Kilburn 2003: 47. Sanpanich and Duangdee 2013: 55. Okutani 2017: 838, pl. 114, fig. 3. Yang et al. 2017: 32, fig. 117.

Crepidula (Siphopatella) walshi . Dharma 2005: 78, pl. 14, fig. 13 a, b; 342, pl. 136, fig. 15 a, b.

Crepidula (Ergaea) walshi . Thach 2005: 66, pl. 10, fig. 27.

Referred material.

CUF - NKNY - G 25 (10 shells; Figs 3 H , 6 E ).

Habitat.

Attached to the aperture of other shelled marine organisms, in intertidal zones down to 40 m depth ( Robba et al. 2004; Thach 2005; Low and Tan 2014).

Distribution.

Persian Gulf; Indo-West Pacific, from Japan to the Arafura Sea ( Robba et al. 2004; Okutani 2017). Several records of fossils from the Late Miocene to Holocene in India, Indonesia, Japan, Taiwan, and Thailand ( Robba et al. 2004; Dharma 2005).

Record in Thailand.

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

Taxonomic remarks and comparisons.

This species is recognised by an irregularly subrectangular and flattened shell, with a small apex close to the posterior margin, and a shelf-like internal septum attached just inside the posterior margin ( Robba et al. 2004). See also comprehensive taxonomic remarks in Low and Tan (2014).

Superfamily Tonnoidea Suter, 1913

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 6. Gastropods A Eunaticina papilla B Natica stellata C Natica vitellus D Paratectonatica tigrina E Ergaea walshi F Bufonaria rana G Merica elegans H Scalptia scalariformis.