Seminavis cf. pusilla (Grunow) Cox & Reid

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

54. Seminavis cf. pusilla (Grunow) Cox & Reid ( Figs 126, 127 )

Basionym: Cymbella pusilla Grunow.

Synonym: Navicymbula pusilla (Grunow) Krammer.

Type locality: Kunsee; Bayonne.

References: Cox & Reid 2004, p. 60; Cavalcante et al. 2014, p. 258, figs 1, 2; Donadel 2018, p. 14, figs 3m, 14a–g.

Morphometrics: Valves 17–22 (22–30) μm long, 5–7 (5–7) μm wide, transapical striae 18–19 (17–19) in 10 μm in dorsal side, 16 (15–17) in 10 μm in ventral side.

Remarks: Specimens collected in local areas exhibit lower valve length and width. Seminavis pusilla has been reported in a lagoon of the Galapagos Islands ( Seddon et al. 2011), coastal Mediterranean Spanish lakes ( Antón-Garrido et al 2013), lagoons of the southern Brazil ( Donadel 2018), and southern Everglades of Florida ( Mazzei et al. 2018). The brackish species inhabits saline lakes in the desert of Inner Mongolia, China ( Rioual et al. 2014). Further, the species has been reported in freshwater with a high mineral content throughout the United States as Navicymbula pusilla ( Potapova 2011) , and in a river of Northeast Brazil as Seminavis pusilla ( Cavalcante et al. 2014) . Despite the unusual distribution, it has been reported in tropical or subtropical coasts. In South Korea, it was encountered rarely in reed marsh in the lagoon of the Seogwipo coast in Jeju Island, and represents a new record for South Korea.

Figures

FIGURES 121–134. Diatom taxa of Seogwipo coast in Jeju Island (13). Figs 121, 122. Amphora bigibba var. interrupta. Figs 123, 124. A. staurohyalina. Figs 125, 130. Nitzschia marginulata var. didyma. Figs 126, 127. Seminavis cf. pusilla. Figs 128, 129. Nitzschia composita. Figs 131, 132. Seminavis latior. Fig. 133. Tetramphora intermedia. Fig. 134. T. decussata. Scale bars = 10 μm.