Ulnaria pandurata-uniseriata Bing Liu, 2023
Liu, Bing, 2023, The diatom genus Ulnaria (Bacillariophyta) in China, PhytoKeys 228, pp. 1-118 : 1
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publication ID |
https://dx.doi.org/10.3897/phytokeys.228.101080 |
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persistent identifier |
https://treatment.plazi.org/id/729EB5F6-44B1-590D-B42A-51FDD3DFE2BE |
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treatment provided by |
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scientific name |
Ulnaria pandurata-uniseriata Bing Liu |
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sp. nov. |
Ulnaria pandurata-uniseriata Bing Liu sp. nov.
Figs 77 View Figure 77 , 78 View Figure 78 , 79 View Figure 79 , 80 View Figure 80
Holotype.
Slide JIUDIA202314, specimen circled on slide, illustrated as Fig. 77C View Figure 77 .
Registration.
PhycoBank http://phycobank.org/103820.
Type locality.
China. Hunan province: Lanshan County, Shun River, a sampling location (25°11'29"N, 112°7'47"E, 490 m a.s.l.), collected by Bing Liu, October 5, 2021.
Description.
LM (Figs 77 View Figure 77 ). Valves panduriform with protracted, rostrate apices (Fig. 77A-J View Figure 77 , see also Figs 78A, B View Figure 78 , 79A, B View Figure 79 , 80A, B View Figure 80 ). Valve dimensions (n = 28): length 70-116 μm, width 6.2-8.2 μm at centre. Sternum distinct, extending length of the valve. Central area distinct, rectangular fascia. Striae parallel, radiate only approaching each apex, and mostly opposite across sternum. Stria density 9-11 in 10 μm.
SEM (Figs 78 View Figure 78 - 80 View Figure 80 ). Valve characterized by relatively wide virgae, interconnected with vimines (Fig. 78A-D View Figure 78 ). Ocellulimbus composed of ca. 17 pervalvar and 8 transverse rows of porelli. Two horn-like projections protruding over the ocellulimbus (Fig. 78E, F View Figure 78 ). Striae uniseriate, situated opposite each other across sternum, equidistant until radiate at poles, areolae become elongated closer to the mantle (Figs 78C, D View Figure 78 , 79C, D View Figure 79 ). One rimoportula present at each pole, externally expressed as a simple hole (Fig. 78E, F View Figure 78 ), internally bilabiate, situated close to sternum (Figs 79E, F View Figure 79 , 80E, F View Figure 80 ). Central area rectangular hyaline region (Figs 78C, D View Figure 78 , 79C, D View Figure 79 ). Valvocopula a closed hoop, surrounding the valve internal margin (Fig. 80A, B View Figure 80 ), bearing a mostly continuous row of poroids dividing pars interior from pars exterior, located at the midline (Fig. 80B, D-F View Figure 80 ), lacking ornamentation at both poles (Fig. 80E, F View Figure 80 ). On its advalvar edge, valvocopula has a row of serrated projections, each corresponding internally to a virga (Fig. 80B, D-F View Figure 80 ).
Etymology.
The epithet pandurata>-uniseriata is a combination of the terms pandurate and uniseriate reflecting the panduriform outline of the valve and its mostly uniseriate striae.
Ecology and distribution.
Epilithic in a mountain stream with oligotrophic waters. The following environmental parameters were measured in the field: Conductivity was 53.9 ± 0.6 μS ∙cm-1, pH was 8.4 ± 0.3 and water temperature was 21.9 ± 0.1 °C. So far, its distribution is known only from the type locality.
Discussion.
Ulnaria pandurata-uniseriata is characterized by its panduriform valve outline, rectangular central area, mostly uniseriate striae, and its rostrate apices. It differs from U. jumlensis ( Jüttner) D.M. Williams & Karthick by its narrower valve (6.2-8.2 μm vs 7.5-11.2 μm) and lower stria density (9-11 in 10 μm vs 13-14 in 10 μm) (see Jüttner et al. 2000, p. 249).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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