Navicula zostereti Grunow

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 : 34-35

52. Navicula zostereti Grunow ( Figs 97, 98 , 195–197, 200, 201 )

Type locality: Adriatic Sea.

References: Peragallo & Peragallo 1897–1908, p. 91, pl. 12, fig. 7; Takano 1962, p. 33, fig. 8; Moreira-Filho & de Oliveira-Filho 1976, p. 65, pl. 4, fig. 14; Foged 1987, p. 81, pl. 20, fig. 8.

Morphometrics: Valves 75–91 (65–140) μm long, 15 (11–22) μm wide, transapical striae 7–8 (6–7) in 10 μm, and lineolae distinct, 24–26 in 10 μm.

Remarks: Navicula zostereti is closely similar to Navicula longa var. irregularis Hustedt in valve morphology, but wider in valve breadth (14.5–15.3 vs 9–14 μm) and denser in lineolae on a stria (24–26 vs 16–18 in 10 μm), indicating a large difference in the lineola density on a stria. This species may be mistaken as Navicula longa var. irregularis , (e.g., Witkowski et al. 2000), from many places in the Caribbean Sea, the Indian Ocean, and the Pacific Ocean.

This taxon has been reported from Katsuura and Miyazaki of Japan ( Takano 1962), Brazil ( Moreira-Filho & de Oliveira-Filho 1976), Cuba ( Foged 1984), Viti Levu Island ( Fiji) in the southwestern Pacific Ocean ( Foged 1987), Palawan of Philippines ( Podzorski & Håkansson 1987), the eastern coast of India ( Gouda & Panigraphy 1989), and Guadalupe Island of the Baja California Peninsula, Mexico ( López-Fuerte et al. 2015). It is a diatom taxon inhabiting warmer oceans. It was encountered frequently as an epiphyte along the Seogwipo coast in Jeju Island, and represents a new record for South Korea.

Figures

FIGURES 91–100. Diatom taxa of Seogwipo coast in Jeju Island (10). Figs 91, 92. Fallacia ny. Figs 93, 94. Navicula hochstetteri. Figs 95, 96. N. platyventris. Figs 97, 98. N. zostereti. Figs 99, 100. N. plicatula. Scale bars = 10 μm.

FIGURES 193–202. Diatom taxa of Seogwipo coast in Jeju Island (20). Figs. 193, 194. Cocconeis convexa: sternum valve (Fig. 180) and raphe valve (Fig. 181) of external view. Figs. 195–197, 200, 201. Navicula zostereti: characteristic lineate striation and cental raphe endings in external valves. Figs 198, 199. Hydrosynedra lanceolata: external valves. Fig. 202. Amphipentas pentacrinus: internal valve. Figs 193–202: SEM. Scale bars = 20 μm (Fig. 201), 10 μm (Figs 196, 202), 5 μm (Figs 193, 194, 197), 2 μm (Figs 195, 200), 1 μm (Figs 198, 199).