identifier	taxonID	type	CVterm	format	language	title	description	additionalInformationURL	UsageTerms	rights	Owner	contributor	creator	bibliographicCitation
48CB6B8DB0575D41813D25C10FF686C3.text	48CB6B8DB0575D41813D25C10FF686C3.taxon	http://purl.org/dc/dcmitype/Text	http://rs.tdwg.org/ontology/voc/SPMInfoItems#GeneralDescription	text/html	en	Achnanthidium kangdingnese P. Yu, Q. M. You & Q. X. Wang 2022	<div><p>Achnanthidium kangdingnese P. Yu, Q.M. You &amp; Q.X. Wang sp. nov.</p> <p>Figs 1, 2, 3, 4, 5</p> <p>Description.</p> <p>LM observations (Fig. 1A -AD), valves are linear in shape, with rounded apices. Some individuals were slightly constricted in the middle. Valve length 10.8-23.5 µm, breadth 3.8-4.0 µm (n = 200). On both valves striae are radiate throughout, and striae count cannot be performed with LM. Raphe valve is concave, with a narrow, linear axial area slightly expanded near the center. The central area is well defined with one or two spaced striae. Rapheless valve is convex, with a narrow linear axial area weakly expanded at the middle portion of the valve. The central area is a small oval or absent.</p> <p>SEM observations (Figs 2 - 5), both valves have a narrow hyaline area at the valve face-mantle junction (Figs 2A, B, 4A, B). Raphe valve: Externally, the raphe is filiform and straight (Fig. 2A, B), distal raphe ends are deflected in opposite directions (Fig. 2 A-D), and proximal raphe ends are straight and teardrop-shaped (Fig. 2A, B, E). The number of striae is 34-36 in 10 µm at the middle portion, and 33-38 in 10 µm near the apices (Figs 2A, B; 3A). Areolae are round or oval. The uniseriate striae are composed of 4-7 areolae in the middle portion of the valve (Fig. 2A, B, E), and 1-7 areolae at the apex (Fig. 2 A-D). Valve mantle with a single row of linear areolae extend around the apices with a small interruption at the ends (Fig. 2A, C-E). Internally, the thickening widens at the end (Fig. 3A, C), and the raphe terminates in raised helictoglossae close to the apices (Fig. 3A-C). Proximal raphe ends are distinctly deflected in opposite directions (Fig. 3B, E). Areolae are transapically elongated in throughout valve (Fig. 3C, E). Areolae are occluded by hymene perforated by delicate slits, and each hymen is closely joined with the adjacent hymen (Fig. 3D).</p> <p>Rapheless valve: the single row of pores on the mantle is continuous (Figs 4A-C, 5A, C). Externally, the axial area is linear and weakly expanded in the central area (Fig. 4A, B). On some valves, there are two slit-like areolae oriented longitudinally in the middle region of the axial area (Fig. 4B). Striae are uniseriate, comprised of 3-6 round or transapically oriented areolae in the central area (Fig. 4A, B, D), and 1-5 round or oblong areolae at the apices (Fig. 4A-C). A row of slit-like areolae is present on the mantle (Fig. 4A, B). Internally, the axial area is slightly raised (Fig. 5A). Areolae are transapically oval in the valve (Fig. 5B, C). The number of striae is 34-38 in 10 µm in the center, and 38-40 in 10 µm near the apices (Figs 4A, B; 5A). Areolae are occluded by hymens perforated by delicate slits, and each hymen is closely joined with an adjacent hymen (Fig. 5B, C).</p> <p>Holotype (designated here).</p> <p>SHTU! Slide MGC201508036 in Lab of Algae and Environment, College of Life Sciences, Shanghai Normal University, Shanghai, China. Holotype illustrated in Fig. 1D, R.</p> <p>Type locality.</p> <p>China. Mugecuo lake, Sichuan Province, 30°08'43"N, 101°51'35"E, altitude: 3780 m, leg. Quanxi Wang in August 2015.</p> <p>Etymology.</p> <p>The species so named refers to Kangding County where the holotype was collected.</p> <p>Ecology.</p> <p>Periphytic diatom samples collected in Mugecuo Lake (MGC201508036), pH 7.8, water temperature 12.5 °C, Conductivity 35 μs.cm-1). The sample of this new species occurred at less than 2% relative abundance (total counted 400 valves). There are 5 species that accounted for more than 5% of sample MGC201508036: Pantocsekiella ocellata (Pantocsek) K.T. Kiss &amp; E. Ács (Ács et al. 2016) (47.5%), Brachysira blancheana H. Lange-Bertalot &amp; G. Moser (Lange-Bertalot and Moser 1994) (9.6%), Encyonema silesiacum (Bleisch) D.G. Mann (Round et al. 1990) (7.3%), Staurosira pseudoconstruens (Marciniak) H. Lange-Bertalot (Krammer and Lange-Bertalot 2000) (7.1%), and Nitzschia frustulum (Kützing) A. Grunow (Cleve and Grunow 1880) (5.2%).</p> <p>Distribution.</p> <p>The new species is known only from the type locality.</p></div> 	http://treatment.plazi.org/id/48CB6B8DB0575D41813D25C10FF686C3	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	Yu, Pan;You, Qingmin;Bi, Yonghong;Wang, Quanxi	Yu, Pan, You, Qingmin, Bi, Yonghong, Wang, Quanxi (2022): A new freshwater species Achnanthidium kangdingnese (Bacillariophyta, Achnanthidiaceae) from Sichuan Province, China. PhytoKeys 204: 97-108, DOI: http://dx.doi.org/10.3897/phytokeys.204.89690, URL: http://dx.doi.org/10.3897/phytokeys.204.89690
