Leudugeria janischii (Grunow) Tempère

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 : 18

20. Leudugeria janischii (Grunow) Tempère ( Figs 26–28 , 185, 186 )

Basionym: Euodia janischii Grunow in Van Heurck.

Synonym: Eunotiopsis janischii Grunow in Cleve & M̂ller.

Type locality: not given.

Reference: Van Heurck 1896, p. 539, fig. 287.

Morphometrics: Valves 56–266 μm long, 29–33 μm wide, transapical striae on valves, 1.4–2.6 in 10 μm, areolae on a stria, large and 1.3–1.7 in 10 μm, and striae and areolae on mantle, 6.4 and 7.8 in 10 μm, respectively.

Remarks: It was reported that this taxon is distributed in Japan, China, Ceylon ( Sri Lanka), Australia, the Seychelles, the Galapagos Island, and as fossil diatoms in Sta. Monica in California ( Van Heurck 1896, Leuduger-Fortmorel 1898), but has not been discovered since then. However, there are a report that it occurred in Saba Island of Netherlands Antilles in the Caribbean Sea ( Stancheva & Deheyn 2010). Only one species in the genus, but recently a new species, Leudugeria thermalis Stancheva & Deheyn which is a closely similar to L. janischii , was erected ( Stancheva & Deheyn 2010). This taxon is rare as an epiphyte on rock pools along the Seogwipo coast in Jeju Island, and representing a new record for South Kora.

Figures

FIGURES 22–28. Diatom taxa of Seogwipo coast in Jeju Island (3). Fig. 22–24. Amphitetras antediluviana. Fig. 25. Amphipentas pentacrinus. Figs 26–28. Leudugeria janischii. Scale bars = 10 μm.

FIGURES 185–192. Diatom taxa of Seogwipo coast in Jeju Island (19). Figs 185, 186. Leudugeria janischii: the internal valve and septa at apex (Fig. 185) and external valve (Fig. 186). Fig. 187. Hyalosynedra lanceolata. Figs. 188–192. Licmophora pfannkucheae: head of external valves showing two spines and rimpoportuae in the sternum (Figs 188, 189), internal view of rimpoportulae (Fig. 190), and tail apex of internal and external valves (Figs 191, 192) Figs 185–192: SEM. Scale bars = 20 μm (Figs 185, 186), 5 μm (Fig. 187), 2 μm (Figs 188, 190–192), 1 μm (Fig. 189).