Visit us at

Diatoms of the United States is now known as Diatoms of North America.
This site has been redesigned and updated, and will be closing soon.


Planothidium dubium

(Grunow) Round and Bukht. 1996      Category: Monoraphid
BASIONYM: Achnanthes lanceolata var. dubia

Planothidium delicatulum


Planothidium frequentissimum

LM scalebar = 10 ┬Ám

Slide Number: ANSP GC109668a

Site ID: ANSP MO000295

Site Name: Willow Creek, MT

Latitude: 47.825

Longitude: -116.646

Caption: Rapheless valve

Contributor: Marina Potapova - August 2011