60. Amphora cingulata Cleve (Figs 142, 143, 213–215) Synonym: Amphora ocellata var. cingulata Cleve. Type locality: G. v. Mexico References: Peragallo and Peragallo 1897–1908, p. 219, pl. 48, fig. 3, pl. 49, figs 5–7; Wachnicka & Gaiser 2007, p. 436, fig. 189; Stidolph et al. 2012, pl. 2, figs 53, 54. Morphometrics: Valves 74–77 (70–87) μm long, 13–14.9 (11.5–12.5) μm wide, and transapical striae 23–25 (22–24) in 10 μm. Remarks: This taxon is similar to Amphora ocellata Donkin in valve morphology, but A. cingulata has a more arcuate dorsal margin and more distinct puncta. In addition, it also resembles A. obtusa Gregory and A. arenaria Donkin in valve outlines but it differs from them by having several widely spaced striae at the central portion of the dorsal side of the valve like a kind of stauros (Wachnicka & Gaiser 2007). Amphora cingulata was reported in the coasts of France (Peragallo & Peragallo1897–1908), Palawan of Philippines (Podzorski and Håkansson 1987), Baja California Sur of Mexico (Siqueiros-Beltrones et al. 2005), the Cape Verde in the Atlantic Ocean off the North Africa (Wachnicka and Gaiser 2007). There are not many cases reported worldwide, but it is mainly distributed in the warmer waters such as tropical regions. It was found very rare in Seogwipo coast, and is a new report in South Korea.

Published as part of Joh, Gyeongje, 2021, Distribution and frequent occurrence of diatom taxa (Bacillariophyta) inhabiting warmer oceans in Seogwipo coast of Jeju Island, southernmost Korea, pp. 1-67 in Phytotaxa 517 (1) on page 38, DOI: 10.11646/phytotaxa.517.1.1, http://zenodo.org/record/8061058