Hantzschia amphioxys (Ehrenberg) Grunow f. muelleri Ko-Bayashi

Bulínová, Marie, Kochman-Kędziora, Natalia, Kopalová, Kateřina & Vijver, Bart Van De, 2018, Three new Hantzschia species (Bacillariophyta) from the Maritime Antarctic Region, Phytotaxa 371 (3), pp. 168-184 : 176

publication ID

https://doi.org/ 10.11646/phytotaxa.371.3.2

persistent identifier

https://treatment.plazi.org/id/505387C7-FF9F-FFB7-26B3-FDCDA3265590

treatment provided by

Felipe

scientific name

Hantzschia amphioxys (Ehrenberg) Grunow f. muelleri Ko-Bayashi
status

 

Hantzschia amphioxys (Ehrenberg) Grunow f. muelleri Ko-Bayashi ( Figs 51–65 View FIGURES 51–65 )

LM ( Figs 51–61 View FIGURES 51–65 ):—Valves dorsiventral with a slightly convex to almost straight dorsal margin. Ventral margin weakly concave in the middle becoming slightly convex near the apices. Apices abruptly protracted, elongated and clearly capitate, slightly deflected towards the dorsal side. Valve dimensions (n=25): length 40–55 μm, width 5.0–6.0 μm. Fibulae 6–7 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 and even convergent near the apices, 22–26 in 10 μm. Occasionally, middle striae slightly more spaced than the others. Areolae not discernible in LM. SEM ( Figs 62–65 View FIGURES 51–65 ): Valves on the ventral side bordered by a clearly thickened keel covered with irregularly scattered areolae ( Fig. 62 View FIGURES 51–65 ). Striae located in rather deep grooves bordered by raised costae ( Figs 62, 63 View FIGURES 51–65 ), more prominently deepened near the ventral margins ( Fig. 63 View FIGURES 51–65 ). External areola openings rounded occluded by individual hymenes ( Fig. 63 View FIGURES 51–65 ). External proximal raphe branches deflected, clearly interrupted near the valve middle ( Fig. 63 View FIGURES 51–65 ). Internally, fibulae clearly not equidistant ( Fig. 65 View FIGURES 51–65 ). Internal proximal raphe endings unclear, interrupted by a thickened central nodule ( Fig. 64 View FIGURES 51–65 ). Striae forming narrow, deep, parallel grooves ( Fig. 64 View FIGURES 51–65 ).

Ecology:— Hantzschia amphioxys f. muelleri is a very commonly reported species, often observed in terrestrial habitats such as seepage areas, wet moss vegetations and soils (Kellogg & Kellogg 2002 and references therein). The ecological separation from H. amphioxys is unclear. All populations will need further morphological research to determine their exact ecological preferences.

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