Hantzschia malaysiana M.Rybak, 2022

Mateusz, Rybak, Natalia, Kochman-Kędziora & Muzaky, Luthfi Oktiyas, 2022, Four novel species from the genus Hantzschia Grunow (Bacillariophyta: Bacillariaceae) from rural areas of Southeast Asia, Phytotaxa 567 (3), pp. 207-221 : 212-214

publication ID	https://doi.org/ 10.11646/phytotaxa.567.3.1
DOI	https://doi.org/10.5281/zenodo.7182621
persistent identifier	https://treatment.plazi.org/id/BF32D47F-F96B-FFB9-FF59-66A981B8F792
treatment provided by	Plazi
scientific name	Hantzschia malaysiana M.Rybak
status	sp. nov.

Treatment

Hantzschia malaysiana M.Rybak sp. nov. ( Figs 28–37 View FIGURES 28–45 , 61–67 View FIGURES 61–67 )

LM observations ( Figs 28–37 View FIGURES 28–45 ):— Valves distinctly dorsiventral appearing comparatively strongly silicified. Ventral margin slightly convex, dorsal margin slightly more convex in distal parts and concave in middle. Apices protracted, rostrate in small specimens becoming clearly capitate and deflected towards dorsal side in large specimens. Valve dimensions (n=20): length 55.0–130.0 μm, width 9.0–11.5 μm in middle to 9.5–12.0 μm in widest part of the valve face. Fibulae 5–7 in 10 μm, unequally spaced, two middle fibulae clearly more distant. Striae equidistant, weakly radiate in middle, 16–22 in 10 μm. Areolae not discernible.

SEM observations ( Figs 61–67 View FIGURES 61–67 ):— Valves on ventral side bordered by a clearly thickened keel ( Figs 61, 65 View FIGURES 61–67 ). Striae composed of round areolae occluded by individual hymenes, 36–40 in 10 µm ( Fig. 65 View FIGURES 61–67 ), forming narrow, parallel grooves, between raised virgae ( Figs 61, 65, 67 View FIGURES 61–67 ). Striae on valve mantle organized same as on the valve face ( Figs 65, 67 View FIGURES 61–67 ). External central raphe endings deflected ( Fig. 65 View FIGURES 61–67 ). Distal raphe endings clearly hooked ( Figs 61, 65 View FIGURES 61–67 ). Internally, central raphe endings close to each other and deflected to same direction ( Fig. 66 View FIGURES 61–67 ). Distal raphe endings forming distinct helictoglossae ( Fig. 64 View FIGURES 61–67 ). Internally, fibulae not equidistant ( Fig. 62 View FIGURES 61–67 ). Each fibulae connected to 1–6 transapically costae ( Fig. 62 View FIGURES 61–67 ).

Type:— Malaysia, Cameron highlands, Kuala Terla, 4°32’43”N 101°25’16”E, coll. date. 02 July 2016, holo - slide no. SZCZ28482 View Materials ! and the unmounted material with the same number at the Szczecin Diatom Collection (University of Szczecin, Poland), iso- slide no. 2016/51 and the unmounted material with the same number at the University of Rzeszow, Poland. The type population is illustrated on Figs 28–37 View FIGURES 28–45 and 61–67 View FIGURES 61–67 GoogleMaps .