Hantzschia minima 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 : 209-212

publication ID	https://doi.org/ 10.11646/phytotaxa.567.3.1
DOI	https://doi.org/10.5281/zenodo.7182617
persistent identifier	https://treatment.plazi.org/id/BF32D47F-F96C-FFBB-FF59-623B86F4FE2B
treatment provided by	Plazi
scientific name	Hantzschia minima M.Rybak
status	sp. nov.

Treatment

Hantzschia minima M.Rybak sp. nov. ( Figs 1–15 View FIGURES 1–27 , 46–52 View FIGURES 46–52 )

LM observations ( Figs 1–15 View FIGURES 1–27 ): — Valves dorsiventral with straight or almost straight dorsal margin. Ventral margin weakly concave in middle, becoming slightly convex near apices.Apices abruptly protracted, small and clearly capitate, slightly deflected towards dorsal side. Valve dimensions (n=20): length 17.5–38.5 μm, width 3.5–4.5 μm.

Fibulae 5–8 in 10 μm, unequally spaced, middle two fibulae clearly more distant. Striae equidistant, weakly radiate in middle, 22–25 in 10 μm. In some specimens, striae in valve middle slightly more spaced than others ( Figs 10, 14 View FIGURES 1–27 ). Areolae not discernible.

SEM observations ( Figs 46–52 View FIGURES 46–52 ): — Valves on the ventral side bordered by a clearly thickened keel ( Figs 46, 47 View FIGURES 46–52 ). Striae composed of round areolae occluded by individual hymens. 49–60 in 10 µm ( Figs 47, 51 View FIGURES 46–52 ). External central raphe endings slightly deflected, very close together ( Fig. 51 View FIGURES 46–52 ). Distal raphe endings clearly hooked ( Fig. 49 View FIGURES 46–52 ). Internally central raphe endings deflected to opposite directions ( Fig. 52 View FIGURES 46–52 ). Striae forming narrow, deep, parallel grooves ( Figs 48, 52 View FIGURES 46–52 ). Each fibulae connected to 1–4 transapically costae ( Fig. 48 View FIGURES 46–52 ).

Type:— Indonesia, Kairatu , West Seram , Molouki , 3°21’46.5”S 128°22’19.48”E, coll. date. 28 June 2018, holoslide no. SZCZ28484 View Materials ! and the unmounted material with the same number at the Szczecin Diatom Collection (University of Szczecin, Poland), iso - slide no. 2018/445 and the unmounted material with the same number at the University of Rzeszów, Poland. The type population is illustrated on Figs 1–15 View FIGURES 1–27 and 46–52 View FIGURES 46–52 GoogleMaps .