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Table 2 Summary of the major characteristic features observable with EM used in this study to distinguish between taxa of the section Petersenianae

From: Newly recorded species of the genus Synura (Synurophyceae) from Korea

Taxon Cell size (μm) Scale size (μm) Base plate hole size (μm) Number of struts Distance of struts (μm) Interconnection of struts by transverse folds Other
S. americana Kynčlová & Škaloud 22–28 × 8–12 *3.0–4.2 × 1.7–2.3 0.08–0.27 21–24 0.27–0.30 Almost never interconnected Occasional triangular shape of the keel
S. conopea Kynčlová & Škaloud 20–28 × 8–12 *3.3–4.1 × 1.4–1.9 0.19–0.32 24–30 0.23–0.26 Usually not interconnected Large and closely arranged keel pores
S. glabra Korshikov emend. Kynčlová & Škaloud 19–28 × 10–14 *2.4–3.4 × 1.5–2.4 0.14–0.32 17–22 0.25–0.29 Never interconnected With a small, narrow and sometimes bent keel
S. petersenii Korshikov emend. Škaloud & Kynčlová 20–31 × 8–12 *3.6–4.6 × 1.8–2.3 0.24–0.36 26–34 0.24–0.28 Mainly interconnected Large scale dimensions, common presence of transverse folds
S. truttae (Siver) Škaloud & Kynčlová 22–31 × 11–13 *3.3–3.8 × 1.5–1.8 0.32–0.56 27–33 0.19–0.24 Mainly interconnected Keel tip has several (two to four) very short teeth on its top end and large base plate hole
  1. *The dimensions of body scales