Distribution and frequent occurrence of diatom taxa (Bacillariophyta) inhabiting warmer oceans in Seogwipo coast of Jeju Island, southernmost Korea Author Joh, Gyeongje text Phytotaxa 2021 2021-08-30 517 1 1 67 http://dx.doi.org/10.11646/phytotaxa.517.1.1 journal article 10.11646/phytotaxa.517.1.1 1179-3163 8061058 2. Aulacodiscus orientalis Greville ( Fig. 9 ) Type locality: Ceylon . References: Schmidt et al. 1874–1959, pl. 34, figs 1–3; Williams 1988 , p.15, pl. 17, figs 1–3; Lobban et al. 2012 , p. 249, pl. 5, figs 3–5. Morphometrics: Valves 187 (85–140) μm, striae radiate from the center, 5 in 10 μm, areolae 3.5 in 10 μm on a stria. Thirteen pseudocelli on elevations in the corner of valve. Remarks: Aulacodiscus orientalis was reported in some places, North Celebes of Indonesia and Hawaiian Islands (Schmidt et al. 1874–1959), mangrove swamps of South Nigeria ( Mills 1932 ), Guam in the western Pacific Ocean ( Lobban et al. 2012 ), and the western coast of India (Sushanth and Rajashekhar 2012). This taxon is a typical one inhabiting warmer oceans. It was encountered once in this sampling areas, the Seogwipo coast, representing a new record for South Korea .