identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
459382DCD60A5C43955460E07D5A482F.text	459382DCD60A5C43955460E07D5A482F.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Navicula congqiancuoensis W. Zhang & S. Blanco 2025	<div><p>Navicula congqiancuoensis W. Zhang &amp; S. Blanco sp. nov.</p><p>LM: Figs 1–7, SEM: Figs 8–13, 14–18</p><p>Description.</p><p>Light microscopy (LM) (Figs 1–7). The valve is linear to linear-lanceolate, with a slight widening in the center and broadly rounded at the apices, with a length of 42.7–51.2 μm and a width of 4.9–6.1 μm, giving an average L / W ratio 8.2 (40 valves were measured to obtain these size ranges). The raphe is weakly lateral, and the external distal raphe ends are deflected on to the mantle. The striae are radiate and convergent at the ends, and there are two to three short striae in the central area, 14–16 in 10 μm. The axial area is narrow and linear, and the central area is small and elliptical in the central nodule.</p><p>Scanning electron microscopy (SEM) (Figs 8 – 18). External view: Valves flat. Raphe fissure straight (Figs 8, 9). Proximal raphe endings slightly unilaterally hooked towards secondary valve side. External distal raphe endings curved to the secondary side of valve, with ends positioned on valve mantle (Figs 10, 12). Axial area very narrow and often thickened. Lineolae density ca. 50 in 10 µm (Fig. 11). Transversal striae radial, convergent at the ends. The lineolae and the virgae separating them are aligned longitudinally so that there appear to be both longitudinal and transverse striae (Figs 8–13). Internal view: the raphe is straight and slightly inclined towards the secondary valve side (Fig. 14). On the side of the raphe sternum opposite to central nodule, there is a longitudinal, semilanceolate thickening. Distal raphe endings are well-developed helictoglossae (Figs 15, 16). The accessory rib is well-developed on the primary valve side and unilaterally widened in the center, forming an asymmetrical central nodule that is visible under light microscopy (Figs 17, 18). The Voigt discordance is not visible in the valves we observed.</p><p>Type.</p><p>China. • Sichuan Province: Tibetan Autonomous Prefecture of Garzi, Daocheng County, Haizishan Nature Reserve, <a href="https://tb.plazi.org/GgServer/search?materialsCitation.longitude=100.08083&amp;materialsCitation.latitude=29.366112" title="Search Plazi for locations around (long 100.08083/lat 29.366112)">Lake Congqiancuo</a>, 29°21'58"N, 100°04'51"E, elevation 4389 m a. s. l., samples collected by Q. C. ZHOU, 20 Sep. 2018. Holotype CQC 1 #, SHOU! Herbarium of Hydrobiological Department, College of Fisheries and Life Science, Shanghai Ocean University (SHOU), Shanghai, China = Fig. 3.</p><p>Etymology.</p><p>The specific epithet, congqiancuoensis, refers to the locality from which the new species was described.</p><p>Ecology.</p><p>Navicula congqiancuoensis sp. nov. was found in epilithon samples collected in a high-altitude freshwater lake, with a pH of 8.9–9.4 and very low conductivity of 17.5–17.6 µS / cm. The water temperature at the time of collection was 13.5 ° C, total nitrogen (TN) 0.032–0.043 mg / L, total phosphorus (TP) 0.014–0.016 mg / L.</p></div>	https://treatment.plazi.org/id/459382DCD60A5C43955460E07D5A482F	Public Domain	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.		Pensoft via Plazi	Jiang, Yu-Fei;Blanco, Saúl;Zhang, Wei	Jiang, Yu-Fei, Blanco, Saúl, Zhang, Wei (2025): Navicula congqiancuoensis sp. nov. — a new diatom species (Bacillariophyceae) from Sichuan Province, China. PhytoKeys 257: 209-217, DOI: 10.3897/phytokeys.257.152987
