Amphora staurohyalina Podzorski & Håkansson

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 : 38

61. Amphora staurohyalina Podzorski & Håkansson ( Figs 123, 124 , 203–206 )

Type locality: Philippines: Palawan: Malapakan Cove, Langen (Malapakan) Island, Taytay .

Reference: Podzorski & Håkansson 1987, p. 52, pl. 15, fig. 11, pl. 51, figs 4–6.

Morphometrics: Valves 25–32 (33) μm long, 4 (5) μm wide, and transapical striae unresolved in LM, 34 in 10 μm in SEM.

Remarks: The characteristic morphological features include a narrow hyaline stauros in the central area dorsally and double rows of striae.

Amphora staurohyalina is a tropical taxon found in warmer coasts, and has not been reported in any other location except the type locality, Palawan of Philippines . It was more or less frequently encountered as an epiphyte along 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.

FIGURES 203–212. Diatom taxa of Seogwipo coast in Jeju Island (21). Figs 203–206. Amphora staurohyalina: external (Figs 203, 204) and internal view (Figs 205, 206) of valves, double striation, hyaline thickened stauros in the middle parts of dorsal side, and apical folds on valve. Figs 207–210. Amphora arenaria: dotted striation and arcing central raphe endings of the external valves (Figs 207–219), internal view of valve (Fig. 210). Figs 211, 212. Diploneis gemmatula: external view of valve. Figs 203–212: SEM. Scale bars = 20 μm (Fig. 211), 10 μm (Figs 207, 210), 5 μm (Figs 203, 206, 209), 2 μm (Figs 204, 205, 208, 212).