Table 1 in Cymbopleura natellia - a new species from Transbaikal area (Russia, Siberia) described on the basis of molecular and morphological investigation

Table 1. Differences between species of the genus Cymbopleura. OutlineEndsAxial areaCentral areaValve length (μm)Valve width (μm)Striae in 10 μmAreolae in 10 μmDistributionReferenceC. natellia sp. nov.subelliptical, dorsiventral with moderately convex dorsal margin and slightly convex ventral margin, which more often almost straight near the valve centrebluntly rostrate, not protractednarrow, more often weakly expands to central area, less often - almost not expands, almost the median line of the valvemore or less pronounced, rounded, 1/3 the valve breadth17.6-23.58.7-9.513-15 at the central part, 18-20 near the ends30-35Russia: Baikal LakeThis studyC. naviculiformiselliptic-lanceolate, moderately dorsiventral, dorsal margin strongly arched, ventral margin slightly convex to nearly flatrostrate to subcapitate, narrow-protractednarrow, linear or slightly broader towards the relatively large central area, almost in the median line of the valverounded, one-half to two-thirds valve width26-509.0-13.010-15 at the central part, 16-19 near the ends27-35Widely distributedKrammer 2003; Bahls 2019C. designatabroadly lanceolate, moderately dorsiventral with strongly arched dorsal and ventral marginsapiculate, extending laterally from valve endsarea about 1/4th to 1/5th valve width, slightly curved and narrower near apicesrounded, scarcely wider than the axial area26-379.0-11.612-14 at the central part, up to 18 near the ends26-30Sub-Arctic and ArcticLange-Bertalot and Genkal 1999; Bahls 2019C. frequensnot or very slightly dorsiventral, subelliptical-lanceolate, dorsal an ventral margins moderately archedprotracted, apiculate to rostratenarrow, linear, narrowing slightly towards to the ends, almost median line of the valveirregular, asymmetric space of different extent14-386-911-14 at the central part, 16 near the ends30-36HolarcticKrammer 2003; Kulikovskiy et al. 2016; Bahls 2019C. hercynicaslightly dorsiventral, broadly subelliptical to elliptical-lanceolate, dorsal margins strongly, ventral margin slightly archedapiculate to subrostrate protractedvery narrow, almost the median line of the valve1/3-1/2 the valve breadth, distinctly set off, rounded, sometimes asymmetrical and then more well-developed dorsally16-407-1012-15 at the central part, up to 20 near the ends32-36Holarctic, saline habitats or with higher electrolyte contentKrammer 2003; Li et al. 2007