Diatoms of North AmericaDiatoms of North America
Return to overview

Compare Geissleria declivis

(Hust.) Lange-Bert. 1996

Compare

Geissleria decussis valves are larger, have a larger central area, and have much more radiate striae.

Geissleria decliviformis has only been reported from Lake Baikal, Russia. Geissleria decliviformis has more distinctly protracted apices and the stria density is lower near the apices.

LM scalebar = 10 µm
Geissleria declivis LM2 Geissleria declivis LM5 Geissleria declivis LM4 Geissleria declivis LM7 Geissleria declivis LM1 Geissleria declivis LM6
Length Range
18.3-20 µm
Width Range
5.8-6.6 µm
Striae in 10 µm
18-21 in the center, 22-24 at the valve ends

Geissleria decussis

(Østrup) Lange-Bert. and Metzeltin 1996

Geissleria decussis LM7 Geissleria decussis LM2 Geissleria decussis LM4 Geissleria decussis LM1 Geissleria decussis LM3 Geissleria decussis LM5 Geissleria decussis LM6
Length Range
16-30 µm
Width Range
6–9 µm
Striae in 10 µm
14-18

Also compare to

Geissleria decliviformis

Metzeltin, Kulikovskiy and Lange-Bert. 2012