Diatoms of North AmericaDiatoms of North America
Return to overview

Compare Planothidium amphibium

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

Compare

Planothidium lanceolatum has rostrate valve apices. Small specimens of the two species, however, may not be distinguishable. Planothidium biporomum has a cavum on the rapheless valve, while P. amphibium has a rimmed depression.

LM scalebar = 10 µm
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 lanceolatum

(Bréb. ex Kütz.) Lange-Bert. 1999

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 biporomum

(M.H.Hohn and Hellerman) Lange-Bert. 1999

Planothidium bipororum LM3 Planothidium bipororum LM1 Planothidium bipororum LM4
Length Range
12-25 µm
Width Range
5.4-7.0 µm
Striae in 10 µm
12-15

Also compare to

Planothidium haynaldii