Toxarium hennedyanum (Gregory) Pelletan, 1889

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 : 13

13. Toxarium hennedyanum (Gregory) Pelletan ( Figs 51–54 )

Basionym: Synedra hennedyana Gregory.

Type locality: Scotland: Lamlash Bay .

References: Hustedt 1931 –1959, p. 222, fig. 713; Witkowski et al. 2000, p. 83, pl. 30, fig. 11, pl. 31, fig. 7; Lobban et al. 2012, p. 260, pl. 17, figs 1–5.

Morphometrics: Valves 355–458 (300–900) μm long, 6–9 (6–8) μm wide, transapical striae 8–10 (9–11) in 10 μm, puncta on a stria 9–11 in 10 μm.

Remarks: Toxarium hennedyanum is widespread in European coasts, but usually rare ( Witkowski et al. 2000). This taxon has been reported from Port Hacking of Australia ( Wood 1963), from Tahiti ( Ricard 1977), from Puerto Rico ( Navarro 1982a), from Chang Islands of Thailand ( Teanpisut & Patarajinda 2007), in the Bahamas ( Hein et al. 2008), in Guam ( Lobban et al. 2012), and common in Réunion Island and rare in Rodrigues Island, also in the Seychelles and Mauritius Island ( Al-Handal et al. 2016). It inhabits warmer oceans, but also in temperate coasts. This is already reported from the Jeju Island in Korea ( Lee & Park 2015), and this time, rare as an epiphyte on seaweeds along the Seogwipo coast.

Figures

FIGURES 46–57. Diatom taxa of Seogwipo coast in Jeju Island (6). Figs 46–49. Ardissonea formosa. Fig. 50. Ardissonea sp. Figs 51–54. Toxarium hennedyanum. Figs 55–57. Licmophora pfannkucheae. Scale bars = 10 μm.