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Morphological variability of stomatocyst 131 Pang & Wang (Chrysophyceae) from a freshwater shallow lake in South Urals, Russia
No full textIgnatenko, Marina, Yatsenko-Stepanova, Tatyana, Kapustin, Dmitry (2022): Morphological variability of stomatocyst 131 Pang & Wang (Chrysophyceae) from a freshwater shallow lake in South Urals, Russia. Phytotaxa 542 (1): 100-104, DOI: 10.11646/phytotaxa.542.1.10, URL: http://dx.doi.org/10.11646/phytotaxa.542.1.1
Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes
No full textIgnatenko, Marina, Yatsenko-Stepanova, Tatyana, Kapustin, Dmitry (2022): Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes. Phytotaxa 561 (1): 14-26, DOI: 10.11646/phytotaxa.561.1.2, URL: http://dx.doi.org/10.11646/phytotaxa.561.1.
Hymenomonas roseola F. Stein 1878
No full textHymenomonas roseola F. Stein (Figs. 2–4) Coccolith is bowl-shape (murolith), with more or less straight sides. The funnel-shaped part of the coccolith expands towards the top and has a jagged edge. The number of calcite “teeth” (crystal units) of coccoliths belonging to single cell varies from 11 to 15. The height of coccoliths in the discovered specimens varies within 0.50–1.12 µm; the height of the base and the height of the funnel are approximately the same. This species was observed in Ural River and Ushkotinsky Reservoir (see Table 2).Published as part of Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, pp. 55-64 in Phytotaxa 609 (1) on page 57, DOI: 10.11646/phytotaxa.609.1.5, http://zenodo.org/record/825462
FIGURES 12–23 in Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes
No full textFIGURES 12–23. Chrysophycean stomatocysts observed in this study (SEM). Fig. 12: Stomatocyst 183, Brown & Smol in Brown et al. Fig. 13: Stomatocyst 118, Zeeb et al. Fig. 14: Stomatocyst 47, Hansen. Fig. 15: Stomatocyst 313, Brown & Smol in Brown et al. Figs. 16, 17: Stomatocyst cf. 107, Pang & Wang. Fig. 18: Stomatocyst 260, Zeeb et al. emend. Gilbert et al., forma B. Figs. 19, 20: Stomatocyst 260, Zeeb et al. emend. Gilbert et al., forma A. Fig. 21: Stomatocyst 169, Zeeb & Smol. Figs. 22, 23: Stomatocyst 67, Pang & Wang, forma A. Scale bars = 2 μm.Published as part of Ignatenko, Marina, Yatsenko-Stepanova, Tatyana & Kapustin, Dmitry, 2022, Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes, pp. 14-26 in Phytotaxa 561 (1) on page 21, DOI: 10.11646/phytotaxa.561.1.2, http://zenodo.org/record/705277
FIGURES 24–32 in Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes
No full textFIGURES 24–32. Chrysophycean stomatocysts observed in this study (SEM). Fig. 24: Stomatocyst 27, Van de Vijver & Beyens emend. Pang & Wang. Fig. 25: Stomatocyst 298, Gilbert & Smol in Gilbert et al. Fig. 26: Stomatocyst 11, Vorobyova et al. Fig. 27: Stomatocyst 300, Gilbert & Smol in Gilbert et al. Fig. 28: Stomatocyst 133, Duff & Smol in Duff et al. emend. Wilkinson & Smol in Wilkinson et al., forma С. Fig. 29: Stomatocyst 133, Duff & Smol in Duff et al. emend. Wilkinson & Smol in Wilkinson et al., forma А. Figs. 30–32: Stomatocyst 73, Hansen. Scale bars = 2 μm.Published as part of Ignatenko, Marina, Yatsenko-Stepanova, Tatyana & Kapustin, Dmitry, 2022, Additions to chrysophycean stomatocyst flora from South Urals shallow lake including descriptions of three new morphotypes, pp. 14-26 in Phytotaxa 561 (1) on page 22, DOI: 10.11646/phytotaxa.561.1.2, http://zenodo.org/record/705277
Chrysotila carterae R. A. Andersen, J. I. Kim, Tittley & H. S. Yoon 2014
No full text<i>Chrysotila carterae</i> (Braarud & Fagerland) R.A. Andersen, J.I. Kim, Tittley & H.S. Yoon (Figs. 8, 9) <p> ≡ <i>Pleurochrysis carterae</i> (Braarud & Fagerland) T. Christensen (1978: 68)</p> <p>A disc-shaped coccolith (placolith), composed of two interlocking cycles of crystal units, V and R units, which represent the calcite crystals with subvertical (V units) and subradial (R units) orientations of the c-axis relative to the base plate; 2.2–6 × 1.4–1.7 µm in size.</p> <p>This species was recorded from Zhetykol Lake and Aschisaysky Рond (see Table 2).</p>Published as part of <i>Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, pp. 55-64 in Phytotaxa 609 (1)</i> on pages 59-60, DOI: 10.11646/phytotaxa.609.1.5, <a href="http://zenodo.org/record/8254620">http://zenodo.org/record/8254620</a>
Chrysotila roscoffensis R. A. Andersen, J. I. Kim, Tittley & H. S. Yoon 2015
No full text<i>Chrysotila roscoffensis</i> (P.A. Dangeard) R.A. Andersen, J.I. Kim, Tittley & H.S. Yoon (Figs. 10–14) <p> ≡ <i>Pleurochrysis roscoffensis</i> (P.A. Dangeard) Fresnel & Billard (1991: 77)</p> <p>A disc-shaped coccolith (placolith), that consists of a central vertical tube bounded on each side by shield, there are small nodes on the distal shield of the placolith and within the tube, extending into the central area; 2.46–2.85 × 1.74–1.98 µm in size.</p> <p>This species was recorded from Zhetykol Lake and Aschisaysky Рond (see Table 2).</p> <p> In this study, we found coccoliths in freshwater (Fig. 15), which we could not correlate with any of the described species. We described their as <i>Hymenomonas uralensis sp. nov.</i></p>Published as part of <i>Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, pp. 55-64 in Phytotaxa 609 (1)</i> on page 60, DOI: 10.11646/phytotaxa.609.1.5, <a href="http://zenodo.org/record/8254620">http://zenodo.org/record/8254620</a>
Jomonlithus littoralis Inouye & Chihara 1983
No full text<i>Jomonlithus littoralis</i> Inouye & Chihara (Figs. 5–7) <p> The diameter of the coccolith-bearing cell is 10.5–12.0 µm. The surface of the cell is covered by small oval-shaped coccoliths (muroliths), 1.07–1.39 × 0.77–0.92 µm; rim width 0.11–0.17 µm, rim height 0.2–0.29 µm. The coccolith structure corresponds to the description of Probert <i>et al.</i> (2014) to that which is composed of an organic base plate scale with a lightly calcified rim made up of small rectangular inner and outer sub-elements.</p> <p>This species was observed from a backwater of the Ural River and Zhetykol Lake (see Table 2).</p>Published as part of <i>Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, pp. 55-64 in Phytotaxa 609 (1)</i> on page 58, DOI: 10.11646/phytotaxa.609.1.5, <a href="http://zenodo.org/record/8254620">http://zenodo.org/record/8254620</a>
Hymenomonas uralensis Ignatenko & Yatsenko-Stepanova 2023, sp. nov.
No full text<i>Hymenomonas uralensis</i> Ignatenko & Yatsenko-Stepanova <i>sp. nov.</i> (Fig. 15) <p>Coccoliths are elliptical muroliths. Each coccoliths composed of an organic base plate and calcified elements. The base of the coccolith (0.93–1.2 × 0.8–0.96 µm, n=15) has a jagged edge, followed by a tubular part with more or less straight sides and the expanding part (1.3–1.6 × 0.97–1.3 µm) is formed by overlapping elements. The height of the coccolith is 0.36–0.51 µm, the width of the rim is 0.22–0.3 µm. In most coccoliths a single rim element at each end of the coccolith is extended distally as a rectangular block protruding above the rim (width 0.18–0.33 µm, height 0.25–0.43 µm).</p> <p> <b>Type:</b> —The specimen with <i>Hymenomonas uralensis</i> coccoliths on SEM stub number 49_I_3 deposited at the Herbarium of the Steppe Institute of the Ural Branch of the Russian Academy of Sciences, Orenburg (ORIS). Material from the Ural River (51°25ʼ55”N, 56°28ʼ58”E), Orenburg Region, Russia. Sample collected 27th of July, 2021, by M. Ignatenko.</p> <p> <b>Type Locality:</b> —RUSSIA: Orenburg region, Ural River. 51°25ʼ55”N, 56°28ʼ58”E. 27 July 2021.</p> <p> <b>Etymology:</b> — <i>Hymenomonas uralensis</i> is named after the Ural River, where this species was discovered.</p> <p> <b>Distribution:</b> —Besides the type locality this species was found from the backwater of the Ural River in the vicinity of the Nikolskoye village (see Table 2).</p>Published as part of <i>Ignatenko, Marina & Yatsenko-Stepanova, Tatyana, 2023, Coccolithophores in the algal flora from South Urals (Russia) with the description of a new Hymenomonas species, pp. 55-64 in Phytotaxa 609 (1)</i> on pages 60-61, DOI: 10.11646/phytotaxa.609.1.5, <a href="http://zenodo.org/record/8254620">http://zenodo.org/record/8254620</a>
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