Tab. 2 in Staurastrum cyclacanthum var. pseudobrevissimus - a new variety of desmids and some other rare taxa found in peat bogs (Western Pomerania, Poland)

Tab. 2. Comparison of the characteristics of Staurastrum cyclacanthum var. brevissimum Pal.-Mordv. and a new variety of Staurastrum cyclacanthum. var. pseudobrevissimum W.W.A. Kowalski. et K. Komarzewska. var. nova var. brevissimumvar. pseudobrevissimumW.W.A. Kowalski. et K. Komarzewska. var. novaFeatures of the taxonlength of cells with spines / length of cells without spines25.4 [µm]/ 20.0–21.0 [µm]**38.9–39.1/34.7–35.0 [µm]Width of spine cells/width of spineless cellsno data in the study from 200540.05–41.05 [µm]/36.8[µm]Isthmus7.2 [µm]**7.8–8.4 [µm]Sinusshort, narrowly indented, with a sharp topwidely exposed, pyramidal in outlineOther featuresHalf-cells with a moderately convex top, triangular in outline, with a slight concave in the middle of the side, indentations between the top, the lateral and top surfaces of the half-cells, with 6 two spiny papillae not connected in a circular wreath. Opposite each side of the half-cell there are two bispinous papillae. The arms are weakly extended with 3 pairs of short spines, two of which are located laterally, 1 pair under the top of the semi-cell arm. The ends of the arms are rounded with two spikes.The semi-cells are triangular in shape, inversely trapezoidal, the apical parts are gently rounded, slightly convex, with regularly rounded ends, little distinct arms, and slightly concave between the two pairs of external spines. Isthmus with a small bulge in the middle part. The top of each half-cell has 4 pairs of well-developed spines and one pair at the ends of the arms. In the apical view, the cells are regularly triangular, rounded at the tops, with a pair of spines, at the base of which there is a pair of poorly developed blunt spines. The sides of the semi-cells are tripartite, separated by shallow sinuses. Opposite each side of the half-cell there are two papillae with two spines, each two-spine papilla not connected to the adjacent one. The remaining surface is devoid of other ornamentation elements.OccurrenceOnly in UkraineIn the plankton of peat cut waters no. 1Habitat parametersNo data availablePlankton of surface waters, material collected in September 2005, pH – 8.1, temperature 15.6, electrolytic conductivity of water 808 μS/cm ** – according to Palmar-Mordvienceva (2005)