Hantzschia abundans Lange-Bertalot, 1993
publication ID |
https://doi.org/ 10.11646/phytotaxa.371.3.2 |
persistent identifier |
https://treatment.plazi.org/id/505387C7-FF9F-FFB7-26B3-FB6CA42F57A9 |
treatment provided by |
Felipe |
scientific name |
Hantzschia abundans Lange-Bertalot |
status |
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Hantzschia abundans Lange-Bertalot ( Figs 66–76 View FIGURES 66–76 )
LM ( Figs 66–73 View FIGURES 66–76 ):—Valves dorsiventral with a convex dorsal and a concave ventral margin, typically ventrally constricted near the middle. Apices protracted, clearly elongated. Valve dimensions (n=20): length 55–65 μm, width is 7.0–8.0 μm. Fibulae 5–8 in 10 μm, unequally spaced, the middle two fibulae clearly more distant. Each fibula connected to 1–4 transapical costae. Striae equidistant, weakly radiate in the middle becoming more parallel near the apices, 19–21 in 10 μm. Central striae usually slightly more distant. Areolae not discernible in LM. SEM ( Figs 74–76 View FIGURES 66–76 ): Valves on the ventral side bordered by a narrow hyaline keel ( Fig. 74 View FIGURES 66–76 ). Striae composed of small, rounded areolae, towards the ventral margin located in rather broad, shallow grooves ( Figs 74, 75 View FIGURES 66–76 ). Isolated areolae bordering the ventral keel ( Fig. 75 View FIGURES 66–76 ). External proximal raphe branches straight, clearly interrupted near the valve middle ( Fig. 75 View FIGURES 66–76 ). Internal proximal raphe endings interrupted, straight ( Fig. 76 View FIGURES 66–76 ).
Ecology:—So far, the species was only with certainty confirmed from a seepage area on James Ross Island.
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