Skeletonema ardens 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 : 185-187

publication ID

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

DOI

https://doi.org/10.5281/zenodo.8243231

persistent identifier

https://treatment.plazi.org/id/1F6E031E-FFD0-5675-BCDB-0A9EDE1DFDF0

treatment provided by

Plazi

scientific name

Skeletonema ardens Sarno et Zingone
status

 

Skeletonema ardens Sarno et Zingone

Figs 1–11 View FIGURES 1–6 View FIGURES 7–11

References: Sarno et al. 2007, p. 162, figs 3 A–K; Gu et al. 2012, p. 252, figs 3–6.

Description: Cells are usually arranged in small, delicate, fairly straight to very slightly curved and short chains (2–6 cells per chain) ( Figs 1–3 View FIGURES 1–6 ), although solitary small cells were also found ( Fig. 5 View FIGURES 1–6 ). There are regularly one or two chloroplasts per cell ( Figs 1–3 View FIGURES 1–6 ). The valves are flat to convex, with a mantle relatively high ( Figs 4–9 View FIGURES 1–6 View FIGURES 7–11 ), and small spines (or knobs) are scattered over the valve surface, especially on the mantle ( Figs 4, 5 View FIGURES 1–6 , 7–9 View FIGURES 7–11 , small arrows in Figs 7, 8 View FIGURES 7–11 ). The valves show irregular areolae: rectangular, polyedric or elongate areolae ( Figs 5 View FIGURES 1–6 , 7–9, 11 View FIGURES 7–11 ). Because cingulum bands may appear collapsed, few details of the cingular bands show the valvocopula with longitudinal, elongate poroids and ribs, whereas copulae have rows of tiny poroids ( Figs 7, 8 View FIGURES 7–11 ).

All fultoportulae (terminal -TF- and intercalary -IF- fultoportulae) are open, but have a high variation in length (1.3–3.8 μm), especially TF ( Figs 4–11 View FIGURES 1–6 View FIGURES 7–11 ). The fultoportulae of terminal valves (TF) may be parallel or have an angle and may extend out of the chain axis ( Figs 4, 5 View FIGURES 1–6 ), whereas their tips have conspicuous and very often long spines, which may be variable in length ( Figs 4–11 View FIGURES 1–6 View FIGURES 7–11 ); some terminal fultoportulae (TF) appeared more truncated ( Figs 8, 11 View FIGURES 7–11 ). Each IF connects only one IF of the sibling valve ( Figs 6 View FIGURES 1–6 , 7 View FIGURES 7–11 ). Each fultoportula has three satellite pores ( Fig. 11 View FIGURES 7–11 ). The rimoportulae of terminal valves (TR) occur in the valve margin, between two fultoportulae ( Figs 4–10 View FIGURES 1–6 View FIGURES 7–11 ), are usually tubular and may be longer than the fultoportulae ( Figs 4–6 View FIGURES 1–6 , 9 View FIGURES 7–11 ), or about the same length ( Figs 7, 10 View FIGURES 7–11 ), although a very short rimoportula was found at one terminal valve ( Fig. 8 View FIGURES 7–11 ); extremely long terminal rimoportulae (and fultoportulae) were detected in some few cells ( Figs 4, 5 View FIGURES 1–6 ), and it is suggested to be also represented in Fig. 1 View FIGURES 1–6 (small arrow). Rimoportulae of intercalary valves are also tubular, and have the same length of the fultoportulae ( Fig. 7 View FIGURES 7–11 ).

Measurements: cell diameter 2.3–4.6 μm, areolae density 46–58 in 10 μm (other morphometric data are also provided in Table 1 View TABLE 1 ).

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