Chaetoceros densus (Cleve) Cleve (1901: 15
publication ID |
https://doi.org/ 10.11646/phytotaxa.314.1.1 |
DOI |
https://doi.org/10.5281/zenodo.13701771 |
persistent identifier |
https://treatment.plazi.org/id/038587FE-514C-FFEC-6AE5-FDA8DE0DFB42 |
treatment provided by |
Felipe |
scientific name |
Chaetoceros densus (Cleve) Cleve (1901: 15 |
status |
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Chaetoceros densus (Cleve) Cleve (1901: 15 View in CoL , 16, 24, 28) ( Figs 13–15 View FIGURES 13–23 )
References:— Hustedt (1930), Rines & Hargraves (1988), Hernández-Becerril (1996), Jensen & Moestrup (1998), Lee et al. (2014b).
Synonyms: — Chaetoceros borealis var. densa Cleve , Chaetoceros borealis var. brigthwellii Cleve , Chaetoceros brightwellii (Cleve) Mills.
Morphometry: —a.a.: 17–38 μm; p.a.: 13–63 μm
LM: —Cells are united into robust, straight and long chains. Cells are rectangular in girdle view with diagonally cut valve corners ( Fig. 13 View FIGURES 13–23 ). Cells and setae contain numerous small chloroplasts. The valve face is flat or slightly concave; the mantle is high and shows a visible constriction at its edge ( Fig. 13 View FIGURES 13–23 ). A simple hole-shaped rimoportula is present in the centre of each valve ( Fig. 14 View FIGURES 13–23 ). The long, thick and straight setae originate inside the valve margin. Apertures are narrow and slit- or hexagonally shaped ( Fig. 13 View FIGURES 13–23 ). In valve view, the intercalary setae diverge from the apical plane at equal angles (ca. 30–45°) ( Fig. 14 View FIGURES 13–23 ). Terminal setae are almost parallel to the chain axis.
EM: —The setae are four-sided (not shown) with the rows of sharp stipule-shaped spines on the ridges. Each side is perforated by small poroids arranged in a grid pattern, comprising 12–15 longitudinal rows and a single row of poroids between transverse costae ( Fig. 15 View FIGURES 13–23 ).
Distinctive features: —Very narrow apertures. Four-sided setae with each side ornamented with small poroids arranged in a grid pattern, with 12–15 longitudinal rows of poroids.
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Chaetoceros densus (Cleve) Cleve (1901: 15
Bosak, Sunčica & Sarno, Diana 2017 |
Chaetoceros densus
Cleve, P. T. 1901: 15 |