Cocconeis heteroidea Hantzsch

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 : 27

37. Cocconeis heteroidea Hantzsch ( Figs 73, 74 )

Type locality: East Indies .

References: Hustedt 1931 –1959, p. 256, fig. 811; Suzuki et al. 2001, p. 131, figs 1–28; Lobban et al. 2012, p. 287, pl. 40, figs 6, 7, pl. 41, figs 1–3.

Morphometrics: Valves 36–55 (20–70) μm long, 30–47 (18–65) μm wide, transapical striae of sternum valve 25 (25–28) in 10 μm of sternum valve, 23 (18–25) in 10 μm of raphe valve.

Remarks: Cocconeis heteroidea is widespread in the littoral zones of warmer oceans and Europe, and generally found in the Mediterranean Sea ( Hustedt 1931 –1959, Witkowski et al. 2000). This taxon has been reported from Amursky Bay of Russia and the East Sea ( Orlova et al. 2009), from Guam, Society Islands, Mahé, Puerto Rico, the Bahamas and the Caribbean Sea ( Lobban et al. 2012), and is widespread and abundant as epiphytons in the Mediterranean Sea ( Majewska et al. 2014). In South Korea, it was already reported as an epiphyte on Zostera in Geoje, in the southern coast of Korea ( Chung & Lee 2008), and currently very rarely epiphytic on seaweeds along the Seogwipo coast.

Figures

FIGURES 69–77. Diatom taxa of Seogwipo coast in Jeju Island (8). Figs 69–72. Hyalosynedra lanceolata. Figs 73, 74. Cocconeis heteroidea. Figs 75–77. Achnanthes trachyderma. Scale bars = 10 μm.