Indothais gradata ( Jonas, 1846 )

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

Indothais gradata ( Jonas, 1846)

Figs 4 F , 7 F

Purpura gradata Jonas, 1846: 14 – 15. Type locality: Indian Ocean, near Singapore.

Thais gradata . Bussarawit 1991: 33. Middelfart 1997: 367 – 368, pl. 4, fig. 1. Tan 2000: 499. Hylleberg and Kilburn 2003: 76. Dharma 2005: 170, pl. 60, fig. 11 a, b; 340, pl. 135, fig. 1 a – e. Printrakoon et al. 2008: table 1. Yang et al. 2017: 76, fig. 316.

Stramonita gradata . Wilson 1994: 47, pl. 4, fig. 5 a, b. Thach 2005: 128, pl. 37, figs 33, 37.

Indothais gradata . Okutani 2017: 963, pl. 255, fig. 9. Wells et al. 2021: 114.

Referred material.

CUF - NKNY - G 29 (1 shell; Figs 4 F , 7 F ).

Habitat.

Rocky bottom at a depth from 1 to 5 m ( Thach 2005; Okutani 2017).

Distribution.

Indo-West Pacific, from Japan to Australia ( Okutani 2017; Yang et al. 2017). Records of fossils from the Middle to Late Pliocene in Indonesia ( Dharma 2005).

Record in Thailand.

Andaman Sea ( Wells et al. 2021).

Taxonomic remarks and comparisons.

This species is recognised based on the descriptions and figures in Middlefart (1997), specifically in having an erect and crenulate outer lip, which has a pronounced indentation in the subsutural ramp area, and an aperture with four denticles with proceeding lirae present inside.

Figures

Figure 4. Size comparison of gastropods found in this study A Brunneifusus ternatanus B Murex trapa C Indothais lacera D Pristiterebra miranda E Chicoreus capucinus F Indothais gradata G Ellobium aurisjudae H Inquisitor vulpionis I Turricula javana J Architectonica perdix K Pseudoneptunea varicosa L Cassidula nucleus M Pseudoetrema fortilirata N Paradrillia melvilli O Duplicaria tricincta P Granuliterebra bathyrhaphe Q Comitas ilariae R Cylichna modesta S Maoritomella vallata.

Figure 7. Gastropods A Pseudoneptunea varicosa B Brunneifusus ternatanus C Nassarius micans D Nassarius siquijorensis E Chicoreus capucinus F Indothais gradata.