Tryblionella cf. jelineckii (Grunow) D.G.Mann

Lobban, Christopher S. & Witkowski, Andrzej, 2023, Marine benthic diatoms of Guam: new records, Dictyoneis apapae sp. nov., and updates to the checklist, Micronesica 2023 (2), pp. 1-75 : 16

Tryblionella cf. jelineckii (Grunow) D.G.Mann Figs 107–110

Ref. illus.: Peragallo & Peragallo 1897 –1908 p. 268, pl. 69, fig 19, Hein et al. 2008, p. 84, pl. 58, fig. 19 (both as Nitzschia jelineckii Grunow ); J.S. Park et al. 2022, p. 20, fig. 58.

Samples: GU52X-5

Dimensions: Length 121–158 µm, width 22 µm; striae 12–14 in 10 µm, fibulae 7 in 10 µm.

Diagnostics: Large panduriform species with prominent external costae running the width of the cell.

Comments: Similar to T. plana (W.Smith) Pelletan [ Peragallo & Peragallo 1897 –1908 p. 270, pl. 70, fig. 18; Sims 1996, pl. 194, fig 2; Lopez-Fuerte et al. 2010, pl. 38, fig. 1 (all as Nitzschia plana W.Smith )], but that has 19–20 striae in 10 µm. Not clear from literature that either species has external costae. Montgomery (1978) has two images (pl. 160C and 161D) labeled as “ Nitzschia jelinecki ” but neither has external costae. Peragallo & Peragallo (1897 –1908) commented that they had only seen it in “exotic” samples, the one figured from Java; type was from the Nicobar Islands. This species needs much more study before we can say whether the Guam specimens belong in it or elsewhere.

Figures

Figures 107–110. Tryblionella cf. jelinecki. Fig. 107. Valve in LM. Figs 108, 109. Valve external in SEM. Fig. 110. Valve apex internal aspect. Scale bars: Fig. 107 = 20 µm, Figs 108, 110 = 10 µm, Fig. 109 = 5 µm.