Cymbopleura natellia - a new species from Transbaikal area (Russia, Siberia) described on the basis of molecular and morphological investigation Author Glushchenko, Anton https://orcid.org/0000-0002-2832-1872 K. A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia gluschenkoam@studklg.ru Author Gusev, Evgeniy K. A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Maltsev, Yevhen K. A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Kociolek, John Patrick https://orcid.org/0000-0001-9824-7164 University of Colorado, Boulder; University of Colorado Museum of Natural History, Boulder, Colorado, 80309, USA & Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado, 80309, USA Author Kuznetsova, Irina K. A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia Author Kulikovskiy, Maxim K. A. Timiryazev Institute of Plant Physiology RAS, IPP RAS, 35 Botanicheskaya St., Moscow, 127276, Russia text PhytoKeys 2021 2021-10-19 183 95 105 http://dx.doi.org/10.3897/phytokeys.183.72285 journal article http://dx.doi.org/10.3897/phytokeys.183.72285 1314-2003-183-95 18954917D6815A2592A0B3ADB5A5DE3B

Table 1. Differences between species of the genus Cymbopleura.

	Outline	Ends	Axial area	Central area	Valve length (μm)	Valve width (μm)	Striae in 10 μm	Areolae in 10 μm	Distribution	Reference
C. natellia sp. nov.	subelliptical, dorsiventral with moderately convex dorsal margin and slightly convex ventral margin, which more often almost straight near the valve centre	bluntly rostrate, not protracted	narrow, more often weakly expands to central area, less often - almost not expands, almost the median line of the valve	more or less pronounced, rounded, 1/3 the valve breadth	17.6-23.5	8.7-9.5	13-15 at the central part, 18-20 near the ends	30-35	Russia: Baikal Lake	This study
C. naviculiformis	elliptic-lanceolate, moderately dorsiventral, dorsal margin strongly arched, ventral margin slightly convex to nearly flat	rostrate to subcapitate, narrow-protracted	narrow, linear or slightly broader towards the relatively large central area, almost in the median line of the valve	rounded, one-half to two-thirds valve width	26-50	9.0-13.0	10-15 at the central part, 16-19 near the ends	27-35	Widely distributed	Krammer 2003; Bahls 2019
C. designata	broadly lanceolate, moderately dorsiventral with strongly arched dorsal and ventral margins	apiculate, extending laterally from valve ends	area about 1/4th to 1/5th valve width, slightly curved and narrower near apices	rounded, scarcely wider than the axial area	26-37	9.0-11.6	12-14 at the central part, up to 18 near the ends	26-30	Sub-Arctic and Arctic	Lange-Bertalot and Genkal 1999; Bahls 2019
C. frequens	not or very slightly dorsiventral, subelliptical-lanceolate, dorsal an ventral margins moderately arched	protracted, apiculate to rostrate	narrow, linear, narrowing slightly towards to the ends, almost median line of the valve	irregular, asymmetric space of different extent	14-38	6-9	11-14 at the central part, 16 near the ends	30-36	Holarctic	Krammer 2003; Kulikovskiy et al. 2016; Bahls 2019
C. hercynica	slightly dorsiventral, broadly subelliptical to elliptical-lanceolate, dorsal margins strongly, ventral margin slightly arched	apiculate to subrostrate protracted	very narrow, almost the median line of the valve	1/3-1/2 the valve breadth, distinctly set off, rounded, sometimes asymmetrical and then more well-developed dorsally	16-40	7-10	12-15 at the central part, up to 20 near the ends	32-36	Holarctic, saline habitats or with higher electrolyte content	Krammer 2003; Li et al. 2007