Diatoms of North AmericaDiatoms of North America
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Compare Psammothidium alpinum

Potapova and Enache 2013

Compare

Psammothidium alpinum is similar to P. bioretii in size and similarly coarse areolae. It differs from P. bioretii by having a more elongate, linear-elliptical valve shape with nearly parallel sides, and a straight central sternum (versus diagonal in P. bioretii). While P. bioretii has terminal raphe fissures curved to opposite sides, P. alpinum lacks terminal fissures, and distal external raphe ends are drop-shaped and do not expand beyond the last stria. Psammothidium alpinum is similar to P. chlidanos in valve shape, but it can be easily distinguished by its coarser striae and areolae visible in LM.

LM scalebar = 10 µm
Psammothidium alpinum LM6 Psammothidium alpinum LM3 Psammothidium alpinum LM2 Psammothidium alpinum LM7 Psammothidium alpinum LM4 Psammothidium alpinum LM1 Psammothidium alpinum LM5
Length Range
14.6-30 µm
Width Range
6.3-9.1 µm
Striae in 10 µm
22-25

Psammothidium bioretii

(Germain) Bukht. and Round 1996

Psammothidium bioretii LM3 Psammothidium bioretii LM2 Psammothidium bioretii LM1 Mo000019 1A Ed 3 Mo000019 1B Ed Gs028733 Psbio 1A Ed Gs028733 Psbio 1B
Length Range
12-26 µm
Width Range
5.3-9.1 µm
Striae in 10 µm
23-27

Psammothidium chlidanos

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

Psammothidium chlidanos LM3 Psammothidium chlidanos LM1 Gsn23387 Pschlidanos 2A Ed Gsn23387 Pschlidanos 2B Ed Gc44453 Acchlidanos Type3 Ed 1 Gc44453 Acchlidanos Type6 Ed Gs100739 Pschlidanos 1A Ed
Length Range
12-18 µm
Width Range
4.8-6.2 µm
Striae in 10 µm
27-33