Pseudoetrema fortilirata (Smith, 1879) Figs 4 M, 9 B Drillia fortilirata Smith, 1879 b: 194, pl. 19, fig. 22. Type locality: Station 14, east of Goto Islands, 32 ° 48 ' N, 129 ° 6 ' E; 47 fathoms, and station 21, between south-western extremity of Niphon and the island of Shikoku, 33 ° 45 ' N, 132 ° 30 ' E, 30 fathoms. Yokoyama 1927: 393, 410, pl. 46, fig. 20. Pseudoetrema fortilirata. Oyama 1953: 154. Robba et al. 2004: 141, pl. 19, fig. 6. Robba et al. 2007: 94 (appendix). Okutani 2017: 1017, pl. 311, fig. 7. Wells et al. 2021: 101. Referred material. CUF - NKNY - G 38 (5 shells; Figs 4 M, 9 B). Habitat. Sand and sandy mud in sublittoral areas to 50 m depth (Robba et al. 2004; Okutani 2017). Distribution. Japan and Thailand. Records of fossils from the Pliocene to Holocene in Japan, Taiwan, and 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 Smith (1879 b), Yokoyama (1927), and Robba et al. (2004), specifically in having a high-spired, claviform shell with the sculpture of nine broad and low collabral ribs fading away shortly before the subsutural cord and overriding spirals, three closely set spiral cords: adapical, peripheral, and abapical cords, and a weaker more adapical one on the penultimate whorl, resulting in a total of 14 spirals occurring along the body whorl. This species is the type species of Pseudoetrema (Oyama 1953).

Published as part of 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, pp. 1-110 in ZooKeys 1202 on pages 1-110, DOI: 10.3897/zookeys.1202.119389