Maoritomella vallata ( Gould, 1860 )

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

Maoritomella vallata ( Gould, 1860)

Figs 4 S , 9 A

Drillia vallata Gould, 1860: 336. Type locality: Hong Kong. Johnson 1964: 164, pl. 7, fig. 6.

Asthenotoma vallata . Yen 1944: 575, pl. 51, figs 6, 7.

Maoritomella vallata . Robba et al. 2003: table 5. Robba et al. 2004: 134 – 135, pl. 18, fig. 5 a, b. Robba et al. 2007: 94 (appendix). Wells et al. 2021: 100.

Referred material.

CUF - NKNY - G 30 (5 shells; Figs 4 S , 9 A ).

Habitat.

Probably present in shallow sublittoral areas ( Robba et al. 2004).

Distribution.

Indo-West Pacific. Records of fossils from the Holocene in Thailand ( Robba et al. 2004).

Record in Thailand.

Gulf of Thailand ( Wells et al. 2021).

Taxonomic remarks and comparisons.

This species is recognised based on the descriptions and figures in Yen (1944), Johnson (1964), and Robba et al. (2004), specifically in having a high-spired and claviform shell, with the sculpture of one rather strong and peripheral spiral cord, a weaker one abapical to the spiral cord, and one or two spiral threads on the shoulder slope, resulting in a total of 12–14 spirals occurring along the body whorl. This species is poorly known and has been assigned to Maoritomella due to a blunt, smooth, and paucispiral protoconch (1.5 whorls in this species), which is the diagnostic character of the genus ( Powell 1942).

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 9. Gastropods A Maoritomella vallata B Pseudoetrema fortilirata C Paradrillia melvilli D Comitas ilariae.