Hantzschia australabundans, Bulínová & Kochman-Kędziora & Kopalová & Vijver, 2018
publication ID |
https://doi.org/ 10.11646/phytotaxa.371.3.2 |
persistent identifier |
https://treatment.plazi.org/id/505387C7-FF95-FFBD-26B3-FA85A08D5930 |
treatment provided by |
Felipe |
scientific name |
Hantzschia australabundans |
status |
sp. nov. |
Hantzschia australabundans sp. nov. ( Figs 1–10 View FIGURES 1–6 View FIGURES 7–10 )
Synonym:— Hantzschia abundans sensu Zidarova et al. (2010, p. 322 , Fig. 2 View FIGURES 1–6 ) non sensu Lange-Bertalot (1993, p. 75, Fig. 85 View FIGURES 77–89 : 12–17)
LM ( Figs 1–6 View FIGURES 1–6 ): Valves clearly dorsiventral with a convex ventral side, occasionally flattened in the middle. Dorsal side distinctly concave in the middle but convex towards the apices. Valve apices clearly protracted, rostrate to sub-capitate in large valves, almost capitate in smaller valves. Valve dimensions (n=30): length 48–101 μm, 7.5–12.0 μm. Fibulae, 5–7 in 10 μm, with the median two clearly distant. Each fibula connected to 1–3 transapical costae. Striae radiate in the valve middle, parallel to slightly curved near the apices, equidistant 17–23 in 10 μm. Areolae not discernible in LM. SEM ( Figs 7–10 View FIGURES 7–10 ): Valves showing a narrow hyaline, weakly thickened ventral margin ( Fig. 7 View FIGURES 7–10 ). Striae uniseriate, composed of small, rounded areolae externally covered by individual hymenes ( Figs 9, 10 View FIGURES 7–10 ), ca. 45 in 10 μm. Striae never situated in deep grooves ( Fig. 8 View FIGURES 7–10 ). Externally, the central raphe endings weakly deflected to almost straight, clearly interrupted near the middle ( Fig. 8 View FIGURES 7–10 ). Internally, proximal raphe endings close together, straight, terminating on a thickened central nodule ( Fig. 10 View FIGURES 7–10 ). Internally, fibulae clearly unevenly distributed, connected to 1–4 transapical costae ( Fig. 9 View FIGURES 7–10 ). Transapical striae located in deep grooves ( Figs 9, 10 View FIGURES 7–10 ).
Type:– SOUTH SHETLAND ISLANDS, Livingston Island, sample LIV-BY16A (62°38’10.8”S / 61°6’27.4”W), leg. M. Toro, coll. date 16 December 2006 (holotype, slide BR 4512 ; isotype, slide PLP –342, University of Antwerp , Belgium) GoogleMaps .
Ecology:— Hantzschia australabundans was found in several soil and moss samples on the South Shetland Islands. The largest population was found in sample LIV-BY16A, taken from a biofilm in an area flooded by freshwater between stones on Byers Peninsula close to the main plateau. The sample is dominated by various Luticola , Hantzschia , Pinnularia and Humidophila taxa. Due to confusion with H. abundans , the exact distribution and ecology of this species is not entirely known.
PLP |
Institute of Himalayan Bioresource Technology |
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