Skeletonema grevillei Sarno et Zingone

Hernández-Becerril, David U., 2023, Further studies on the species diversity of the marine planktonic diatom genus Skeletonema (Bacillariophyta) in the Mexican Pacific, Phytotaxa 607 (3), pp. 182-196 : 187

publication ID

https://doi.org/ 10.11646/phytotaxa.607.3.2

DOI

https://doi.org/10.5281/zenodo.8243235

persistent identifier

https://treatment.plazi.org/id/1F6E031E-FFD6-5675-BCDB-0871DB05FB1C

treatment provided by

Plazi

scientific name

Skeletonema grevillei Sarno et Zingone
status

 

Skeletonema grevillei Sarno et Zingone

Figs 12–17 View FIGURES 12–17

References: Zingone et al. 2005, p. 144, figs 5 A–F, 6 A–I; Sarno et al. 2007, p. 162, figs 2 A–J; Naik et al. 2010, p. 291, figs 3–6; Gu et al. 2012, p. 254, figs 15–17; Bužančić et al. 2017, p. 195, figs 2–5.

Description: Chains are relatively thin, delicate, mostly long (2–9 cells per chain, usually more than 6) and straight to slightly curved ( Fig. 12 View FIGURES 12–17 ). Usually there are two chloroplasts per cell ( Fig. 12 View FIGURES 12–17 ). Valves are flat to slightly convex, with a relatively high valve mantle ( Figs 13–16 View FIGURES 12–17 ). Most specimens show siliceous ridges, sometimes poorly developed, dividing valve face and mantle ( Figs 13, 15 View FIGURES 12–17 , small arrows). Additional ridges are also found at the bases of the fultoportulae ( Figs 14, 16 View FIGURES 12–17 , small arrows). The valves have very irregular areolae with rectangular, polyedric or elongate areolae ( Figs 16, 17 View FIGURES 12–17 ). Details of the cingular bands were not observed.

The fultoportulae are open throughout them ( Figs 13–16 View FIGURES 12–17 ), and the TF’s have their tips irregularly truncated ( Figs 13, 15, 16 View FIGURES 12–17 ). Each IF fuses to one of the sibling valve ( Figs 13, 14 View FIGURES 12–17 ). Three to four satellite pores surround each fultoportula ( Fig. 17 View FIGURES 12–17 , arrows). The TR’s are marginal ( Figs 13, 16 View FIGURES 12–17 , arrows), and have a long tube, with an inflated tip ( Figs 13, 15, 16 View FIGURES 12–17 , arrows), whereas the IR is almost marginal, but very short ( Fig. 14 View FIGURES 12–17 , arrow).

Measurements: cell diameter 3.4–5.8 μm, areolae density 33–51 in 10 μm ( Table 1 View TABLE 1 ).

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