Diatoms of North AmericaDiatoms of North America
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Compare Planothidium lanceolatum

(Bréb. ex Kütz.) Lange-Bert. 1999

Compare

Planothidium lanceolatum differs from many other Planothidium species by the presence of a rimmed depression on the internal surface of the central area. The raphe valves of P. lanceolatum may not be distinguishable from the lanceolate raphe valves of P. frequentissimum. The rapheless valves, however, of P. frequentissimum, possess a cavum rather than depression. Planothidium amphibium differs from P. lanceolatum by capitate valve apices.

LM scalebar = 10 µm
De000084 6 De000084 4 De000084 7 Ih042040 Pllanc2 Ih042040 Pllanc4 Ih042040 Pllanc1 Mo000019 1
Length Range
7-24 µm
Width Range
4.5-8.0 µm
Striae in 10 µm
12-15

Planothidium amphibium

C.E.Wetzel, Ector and L.Pfister 2014

Planothidium haynaldii LM1 Planothidium haynaldii LM4 Planothidium haynaldii LM2 Planothidium haynaldii LM3 Planothidium haynaldii LM6 Planothidium haynaldii LM5 Planothidium haynaldii LM7
Length Range
9-25 µm
Width Range
4.8-7.0 µm
Striae in 10 µm
14-15

Planothidium frequentissimum

(Lange-Bert. in Krammer and Lange-Bert.) Lange-Bert. 1999

Gs119780 1 Ed Planothidium frequentissimum LM3 Planothidium frequentissimum LM2 Mo000019 1A Ed 5 Planothidium frequentissimum LM1 Gs181995 1B Ed Mo000019 Plfreq 1B Ed
Length Range
5-17 µm
Width Range
3-6 µm
Striae in 10 µm
13-18