Trachyneis velata (A. Schmidt) Cleve

Joh, Gyeongje, 2021, Distribution and frequent occurrence of diatom taxa (Bacillariophyta) inhabiting warmer oceans in Seogwipo coast of Jeju Island, southernmost Korea, Phytotaxa 517 (1), pp. 1-67 : 35

55. Trachyneis velata (A. Schmidt) Cleve ( Figs 116, 117 )

Basionym: Navicula velata A. Schmidt.

Type locality: Sandwich Island (Hawaiian Islands) .

References: Witkowski et al. 2000, p. 356, pl. 159, figs 7, 8; Lobban et al. 2012, p. 293, pl. 49, figs 1, 2.

Morphometrics: Valves 82–150 (70–130) μm long, 23–27 (20–22) μm wide, transapical striae 10–13 (15–16) in 10 μm.

Remarks: The transapical striae of the local specimens are denser than those of the type ones, and the valves are much wider. Trachyneis velata has been found in False Bay of South Africa ( Giffen 1971), the Indian Ocean ( Giffen 1980), the Caribbean Sea ( Foged 1984, Lobban et al. 2012), and the Pacific Ocean ( Foged 1987, Witkowski et al. 2000, Lobban et al. 2012, Park et al. 2018), and frequently reported from mangrove lagoon of the Baja California Peninsula, Mexico ( Siqueiros-Beltrones & López-Fuerte 2006, López-Fuerte et al. 2010, Siqueiros-Beltrones et al. 2017), and the southern coast of Wellington, New Zealand ( Harper & Harper 2010). It is mentioned on the algal checklist of Hawaii ( MacCaughey 1918). In South Korea, it was encountered frequently as an epiphyte on seaweeds along the Seogwipo coast in Jeju Island.

Figures

FIGURES 111–120. Diatom taxa of Seogwipo coast in Jeju Island (12). Fig. 111. Nitzschia composita. Figs 112, 113. Diploneis nitescens. Figs 114, 115. Trachyneis velata var. ornata. Figs 116, 117. T. velata. Figs. 118, 119. Caloneis cf. excentrica. Fig. 120. Lyrella concilians. Scale bars = 10 μm.