TABLE 1 in A new freshwater species Achnanthes licunese sp. nov. (Achnanthaceae, Bacillariophyta) from pebbles of Licun River, Shandong Province, China

TABLE 1. Comparison of morphological characteristics of Acnanthes licunese sp.nov. and closely related taxa.
Species/featureDimension Length(µm)Width(µm)Valve outlinecenterApicesStriae in 10 µm on RVStriae in 10 µm on ARVSpinesMarginal ridgeTerminal orbiculi on ARVHabitatSourcesA. licunese sp.nov.38.0–53.510.0–12.5linear to linear-lanceolateslightly constrictedobtuse9–109–10cone-shaped, distributed along the margin on the ARVabsentabsentFreshwaterThis studyA. secretitaeniata K.Toyoda & Ji. Tanaka18.0–67.09.0–13.0lanceolate to linear-lanceolateslightly constrictedbroadly rounded9–118–10plate-like, at each apexpresentabsentBrackish waterHeudre et al., 2020A. sinaensis (Hustedt) Levkov, Tofilovska & Wetzel32.5–43.08.5–11.5linear to linear-lanceolateslightly broadbroadly rounded to trunctate10–1110–11absentpresentpresentFreshwaterTofilovska et al., 2014A. prominula Levkov & Tofilovska18.5–43.08.5–10.5linear-lanceolate or elliptic-lanceolateslightly broadattenuated and narrowly rounded11–1210–12absentpresentpresentFreshwaterTofilovska et al., 2014A. coarctata (Brébisson & Smith) Grunow29.0–44.57.0–9.5biundulateconstrictedattenuated and narrowly rounded or rostrate and rounded12–1412–14absentpresentpresentFreshwaterTofilovska et al., 2014