Navicula semiarea Meister, 1934

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 : 34

51. Navicula semiarea Meister ( Fig. 79 )

Type locality: Nagasaki, Japan .

References: Hustedt 1961–1966, p. 655, fig. 1655; Suzuki et al. 1999, p. 154, pl. 5, figs 5–8.

Morphometrics: Valves 34–40 (33–47) μm long, 20–21 (21–27) μm wide, transapical striae 15–16 (15) in 10 μm, puncta on a stria 16–17 (16–18) in 10 μm.

Remarks: Navicula semiarea is distributed in the marine waters of East Asia (Hustedt 1961–1966), and was reported only from Japan, Nagasaki and Niijima Island ( Suzuki et al. 1999). This taxon is probably distributed in the coastal regions of oceans in Northeast Asia. It was found twice in the salt marshes of the Seogwipo coast in Jeju Island, and represents a new taxon for South Korea.

Figures

FIGURES 78–90. Diatom taxa of Seogwipo coast in Jeju Island (9). Fig. 78. Cocconeiopsis orthoneoides. Fig. 79. Navicula semiarea. Figs 80, 81. Fallacia vittata. Figs 82–84. Cocconeis dirupta var. flexella. Figs 85, 86. Achnanthes citronella. Figs 87, 88. Cocconeis pellucida. Figs 89, 90. Planothidium quarnerensis f. rhombica. Scale bars = 10 μm.