Navicula perrhombus Hustedt

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 : 33-34

48. Navicula perrhombus Hustedt ( Figs 102, 103 )

Type locality: Borneo: Miang Besar.

References: Simonsen 1987, p. 163, pl. 262, figs 7–12; Witkowski et al. 2000, p. 298, pl. 141, figs 24–26; Al-Yamani & Daburova 2011, p. 110, pl. 86, figs f–i.

Morphometrics: Valves 17–27 (16–25) μm long, 8–11 (7–8) μm wide, transapical striae 8–10 (10–12) in 10 μm.

Remarks: This species occurred in Tahiti ( Ricard 1977), the Penghu Islands of Taiwan ( Li 1978), Kuwait coast ( Al-Yamani & Daburova 2011) and sandflats of the Nakdong River estuary of Korea ( Joh 2013). The specimens collected from the Red Sea near Eilat and Réunion Islands of the western Indean Ocean are illustrated in Witkowski et al. (2000), and it is on the check-list of epiphytic diatoms in Florida Bay compiled by Frankovich & Wachnicka (2015).

In the Seogwipo coast in Jeju Island, this taxon was rarely found in the benthic sediments and seaweeds in the lagoon and pseudo-lagoons.

Figures

FIGURES 101–110. Diatom taxa of Seogwipo coast in Jeju Island (11). Figs 101, 110. Amphora arenaria. Figs 102, 103. Navicula perrhombus. Figs. 104. Cymatoneis circumvallata. Fig. 105. C. margarita. Figs 106, 107. Diploneis gemmatula. Figs 108, 109. D. notabilis. Scale bars = 10 μm.