Table 1 in A new freshwater species Achnanthidium kangdingnese (Bacillariophyta, Achnanthidiaceae) from Sichuan Province, China

Table 1. Comparison of morphological characteristics of Achnanthidium kangdingnese sp. nov. and closely related taxa. Species/FeatureA. kangdingnese sp. nov.A. contrarea (Lange-Bertalot & Steindorf) Lange-BertalotA. peridotiticum (Moser, Lange-Bertalot & Metzeltin) Lange-BertalotA. indicatrix (Lange-Bertalot & Steindorf) Lange-BertalotA. initium Karthick, Tayl or & HamiltonValve length (μm)10.8-23.515.0-37.015.0-27.020.0-35.011.0-25.5Valve width (μm)3.8-4.06.0-8.03.5-4.85.0-7.53.1-3.6Valve outlineLinearExpanded linear to linear- ellipticalLinear to linear-ellipticalExpanded linear to linear- ellipticalLinear-lanceolate to lanceolateValve apicesRoundedBroad capitateRounded capitateRounded capitateRounded to weakly rostrate roundedRaphe valveAxial areaLinearLinear, linear-lanceolateLinear-lanceolateLinearNarrow linearCentral areaSmall oval or absentRhombic to rectangularRhombicSmall, rhombicAsymmetrical transverseRapheDistal fissures deflected to opposite directionsDistal fissures are hooked towards the opposite sideDistal fissures are strongly hooked towards the opposite sideDistal fissures are strongly hooked towards the opposite sideDistal fissures are strongly hooked towards the opposite sideDensity of striae (10 μm)34-36 (middle), 33-38 (apices)28-32~3024-2729-34Number of areolae per stria4-7 (middle), 1-7 (apices)1-5 (middle), 1-4 (apices)No data5-6 (middle), 1-5 (apices)2-5 (middle), 1-4 (apices)Rapheless valveAxial areaNarrow, linearLanceolateLinearLinearNarrow linearCentral areaAbsentAbsentAbsentAbsentAbsent or weakly ellipticalDensity of striae (10 μm)34-38 (middle), 38-40 (apices)28-32~3025-3032-35Number of areolae per stria3-6 (middle), 1-5 (apices)1-2 (middle), 1-3 (apices)No dataNo data4-5 (middle), 1-3 (apices)ReferencesCurrent studyMoser et al. (1998)Moser et al. (1998)Moser et al. (1998)Karthick et al (2017)