Hantzschia amphioxys (Ehrenberg) Grunow, 1880
publication ID |
https://doi.org/ 10.11646/phytotaxa.371.3.2 |
persistent identifier |
https://treatment.plazi.org/id/505387C7-FF92-FFB7-26B3-F80BA30B530E |
treatment provided by |
Felipe |
scientific name |
Hantzschia amphioxys (Ehrenberg) Grunow |
status |
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Hantzschia amphioxys (Ehrenberg) Grunow ( Figs 35–50 View FIGURES 35–50 )
LM ( Figs 35–46 View FIGURES 35–50 ):—Valves dorsiventral with a slightly convex to almost straight dorsal margin. Ventral margin weakly concave in the middle becoming straight near the apices.Apices abruptly protracted, shortly elongated, clearly capitate, almost straight to slightly deflected towards the dorsal side. Valve dimensions (n=25): length 34–52 μm, width is 5.0–6.0 μm. Fibulae 6–9 in 10 μm, unequally spaced, the middle two fibulae clearly more distant. Each fibula connected to 1–3 transapical costae. Striae equidistant, weakly radiate in the middle becoming more parallel near the apices, 24–25 in 10 μm. Areolae not discernible in LM. SEM ( Figs 47–50 View FIGURES 35–50 ): Valves on the ventral side bordered by a narrow, clearly thickened hyaline keel ( Fig. 47 View FIGURES 35–50 ). Striae located in shallow individual depressions bordered by slightly raised costae ( Fig. 48 View FIGURES 35–50 ). External areola openings rounded occluded by individual hymenes ( Fig. 48 View FIGURES 35–50 ). External proximal raphe branches deflected, clearly interrupted near the valve middle ( Fig. 48 View FIGURES 35–50 ). Internally, fibulae clearly not equidistant ( Fig. 50 View FIGURES 35–50 ). Internal proximal raphe endings interrupted, one end being deflected and the other more or less straight ( Fig. 49 View FIGURES 35–50 ). Striae forming narrow, deep, parallel grooves ( Fig. 50 View FIGURES 35–50 ). Areolae separated by thin struts ( Fig. 49 View FIGURES 35–50 , arrows).
Ecology:—So far, the species was only with certainty confirmed from the moss vegetation collected in a small pool on James Ross Island. Detailed analysis of the stria structure and the internal raphe endings is necessary to avoid confusion with H. amphioxys f. muelleri .
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