Diatoms of Europe: Cymbella

affinis Agardh alveoli apical pore fields apices sensim filiformis apicibus non protractis Area axialis angusta areolae aspera Axial area narrow becoming filiform breadth central area central nodule central pores Cleve Cocconema Croatia Cymbella Cymbella taxa diatom Differential diagnosis distal dorsal and ventral dorsal margin strongly dorsali magis convexa Dubravica Ehrenberg Ends not protracted epilithical excisa Figs foramina fossil Germany Grunow helvetica HUSTEDT initial cells Krammer Kützing Lake Lake Inari lanceolata lanceolate Latere ventrali Lechtaler Alps lectotype Length Lukmanier pass margine dorsali magis margine ventrali leviter maximal length/breadth ratio Metzeltin middle portion narrowly rounded neocistula oligotrophic outline parva praep proximal ends Proximal raphe ends puncta puncta/10 µm reverse-lateral rostrate rotundatis satis differt sensu slide spec stigmata Striae slightly radiate striae/10 µm strongly dorsiventral taxa taxon terminal fissures dorsally Type locality Typus Valvae valve Valve ends ventral ventral margin ventral side µm dorsal µm latae µm longae