Prestauroneis genkalii-a new diatom species (Bacillariophyceae: Stauroneidaceae) from Southeast Asia Author Glushchenko, Anton К. А. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Kociolek, John Patrick Museum of Natural History and & Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado, 80309, USA. Author Kuznetsova, Irina К. А. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Kezlya, Elena К. А. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Kulikovskiy, Maxim К. А. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia text Phytotaxa 2019 2019-08-15 414 4 156 164 http://dx.doi.org/10.11646/phytotaxa.414.4.1 journal article 10.11646/phytotaxa.414.4.1 1179-3163 13715511 Prestauroneis genkalii Glushchenko, Kulikovskiy & Kociolek , sp. nov. ( Figs 1–27 ) Description. LM ( Figs 1–21 ). Valves lanceolate to lanceolate-elliptic with rounded ends. Length 27–62 μm, width 8.0–10.5 μm. Axial area is very narrow. Central area small, rounded, to ellipsoidal, sometimes asymmetrical. At the central area shortened striae sometimes occur. Raphe filiform, straight, proximal raphe ends inconspicuous. Striae uniseriate, finely punctate, radiate, becoming subparallel at the apices, more distantly spaced and sometimes shortened near the central area, 15–17 in 10 μm. SEM, external view ( Figs 22–24 ). Striae uniseriate. Proximal raphe endings are slightly expanded, weakly unilaterally curved. Distal raphe fissures unilaterally curved in opposite way to proximal ends, extending onto the valve mantle. Openings of areolae are variable in shape and orientation, rounded to elliptic, 36–40 in 10 μm. SEM, internal view ( Figs 25–27 ). Proximal raphe endings are indistinct and sometimes hook-like. Helictoglossae are small, positioned below the conspicuous pseudosepta. Raphe located on weakly pronounced sternum-like structure. Central nodule rounded, weakly developed. Openings of areolae round, occluded by hymens. Pseudosepta extend inward from the mantle of each valve apex. Type: — VIETNAM . Cái River, Khánh Hòa Province , benthos, N12°15.983´ E109°06.517´ , leg. E.S. Gusev, 17.04.2010 (in collection of Maxim Kulikovskiy at the Herbarium of the Institute of Plant Physiology Russian Academy of Science, Moscow, Russia), holotype here designated, slide no. 04853 = Fig. 9 ). TABLE 1 . Differences between species of the genus Prestauroneis .
Outline Ends Axial area Central area Valve length (μm) Valve width (μm) Striae in 10 μm Areolae in 10 μm Distribution Reference
P. genkalii sp. nov. lanceolate to lanceolate- elliptical acutely rounded narrow, linear small, rounded 27–62 8–10.5 15–17 36–40 Nam Hinboun River near Kong Lor Cave, Vientiane province, Laos This study
P. pseudocrucicula comb. nov. lanceolate- elliptical subrostrate narrow, linear distinct moderately widened to suborbicular in shape 36.5–46.5 9–11.5 14–18 in the middle and 22–24 towards the ends not given Hozoji-numa, Hanyu City, Saitama Prefecture, Japan Kobayasi & Ando 1975 ; this study
P. blazenciciae lanceolate obtusely rounded, hardly perceptible short- protracted linear small, set off, approximately circular to somewhat irregularly shaped 30.5–57 9.8–13 19 24 Saline spring in Wisselsheim, Bad Nauheim, Hesse, Germany Metzeltin & Lange-Bertalot 2016
P. bondarenkoae lanceolate to lanceolate- elliptical broadly rounded or slightly protracted very narrow small, rounded 24–39 6–8 17.5–20 at the apices, 16–18 near the central area not given Khövsgöl Lake, Mongolia Vishnjakov 2016
P. crucicula elliptical to lanceolate- elliptical slightly beak-shaped, obtuse narrow slightly expanded 31–100 10–24.4 12–24 at the apices, 10–16 near the central area 20–35 Holartic Genkal & Yarushina 2017
P. integra lanceolate to lanceolate- elliptical beak-like, widely rounded narrow small, elliptic- lanceolate 25–43 8–12 15–22 at the apices, 9–15 near the central area not given Holartic Kulikovskiy et al. 2016
P. lowei lanceolate to lanceolate- elliptical rostrate to sub-capitate narrow, linear small, elliptic- lanceolate 25.9–28.4 7.3–4.8 central striae 13–16; distal striae 22–24 not given Zoigê Wetland, Sichuan Province, China Liu et al. 2014
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Outline Ends Axial area Central area Valve length (μm) Valve width (μm) Striae in 10 μm Areolae in 10 μm Distribution Reference
P. nenwae lanceolate to lanceolate–elliptical acutely rounded narrow, linear small, elliptic- lanceolate 22.8–33.8 8.6–9 central striae 17–18; distal striae 22–24 not given Zoigê Wetland, Sichuan Province, China Liu et al. 2014
not protracted, very
P. protracta * lanceolate-elliptical to elliptic slightly subcapitate, through subrostrate, to broadly rostrate, flat, narrow small, rounded 17–60 5–10 14–20 not given Holartic Cantonati et al. 2017; Kulikovskiy et al. 2016
rounded
P. protractoides * linear slightly drawn out, broadly rounded or subcapitate narrow small 17–19 4–5 20 at the centre to 28 close to the poles not given Holartic Cantonati et al. 2017; Kulikovskiy et al. 2016
P. tumida linear-lanceolate to elliptic-lanceolate protracted to subprotracted, broadly rounded narrow, linear not expressed to small lanceolate or elliptic 22–44 9–11 14–17 not given Lake Ohrid, Macedonia Levkov & Williams 2011
* In Cantonati et al. (2017) referred as Parlibellus . FIGURES 1–21: Prestauroneis genkalii Glushchenko, Kulikovskiy & Kociolek , sp. nov. LM, DIC. Slide no 04853. Size diminution series. Figure 9 is of the holotype. Scale bar = 10 μm. Etymology: —Species epithet honors the famous Russian diatomist Dr. Sergei Ivanovich Genkal from Institute for Biology of Inland Waters Russian Academy of Science, Borok, Yaroslavl Region .