Halamphora capitata (Hagelstein) Álvarez-Blanco & Blanco

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 : 38-40

62. Halamphora capitata (Hagelstein) Álvarez-Blanco & Blanco ( Figs 138–140 )

Basionym: Amphora bigibba var. capitata Hagelstein.

Type locality: Naval dock, San Juan Bay , Porto Rico; Harbor of Christiansted, St. Croix .

References: Wachnicka & Gaiser 2007, p. 415, figs 98, 99; Álvarez-Blanco & Blanco 2014, p. 63, pl. 36, fig. 9.

Morphometics: Valves 14–16 (14–32) μm long, 3–4 (3–6) μm wide, transapicalriae in dorsal side 25 (20–26) in 10 μm, absent in ventral side.

Remarks: The most important key to discriminate between Halamphora bigibb a var. capitata and Amphora bigibba are strial density (20–26: 18–20 in 10 μm) and valve size (14–32 μm: 25–39 μm). H. bigibba var. capitata is similar to Amphora kolbei Aleem , but differs by larger valve dimensions (14–32 vs 12–20 μm long, 3–6 vs 2–4 μm wide) and by the deep constriction in the middle dorsally ( Wachnicka & Gaiser 2007, Álvarez-Blanco & Blanco 2014). Local specimens are small in valve length and width, but its shape corresponds to that of the type specimen.

This taxon has been reported from Cuba ( Foged 1984), Paraná coast of the southern Brazil ( Procopiak et al. 2006), southern Florida ( Wachnicka & Gaiser 2007), the Bahamas ( Hein et al. 2008), and the Mediteranean Sea ( Álvarez-Blanco & Blanco 2014). It is subtropical flora inhibiting warmer waters. It was rarely distirbuted along the Seogwipo coast in Jeju Island, and represents a new record for South Korea.

Figures

FIGURES 135–145. Diatom taxa of Seogwipo coast in Jeju Island (14). Figs 135–137. Amphora bigibba. Figs 138–140. Halamphora capitata. Fig. 141. Undatella lineata. Figs 142, 143. Amphora cingulata. Figs 144, 145. Nitzschia vidovichii. Scale bars = 10 μm.