Diatoms of North AmericaDiatoms of North America
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Compare Psammothidium scoticum

(Flower and Jones) Bukht. and Round 1996

Compare

Psammothidium daonense valves are larger and elliptic.

Psammothidium ventralis valves are more gibbous, with wide subrostrate to subcapitate ends, and lower stria density.

Psammothidium acidoclinatum has a wider axial area on the rapheless valve, an elliptic-lanceolate valve shape, and lower stria density.

Psammothidium sacculum has less linear valves, a narrower axial area, central area on raphe valve
bordered by striae of alternate length, smaller central area on rapheless valve, and larger areolae (visible in LM).

LM scalebar = 10 µm
Gsl00810 15A Ed Gsl00810 15B Ed Psammothidium scoticum LM2 Psammothidium scoticum LM3 Psammothidium scoticum LM2 Psammothidium scoticum LM1
Length Range
7.5-12 µm
Width Range
3.9-4.6 µm
Striae in 10 µm
27-30

Psammothidium daonense

(Lange-Bert.) Lange-Bert. 1999

Psammothidium daonense LM3 Psammothidium daonense LM2 Psammothidium daonense LM1 Gs100739 Psdao 4A Ed Gs100739 Psdao 4B Ed Mo000019 1A Ed Gs007601 Psdao 1A Ed
Length Range
9-23 µm
Width Range
4.8-7.5 µm
Striae in 10 µm
24-30

Psammothidium acidoclinatum

(Lange-Bert.) Lange-Bert. 1996

Psammothidium acidoclinatum LM5 Psammothidium acidoclinatum LM4 Psammothidium acidoclinatum LM3 Psammothidium acidoclinatum LM2 Psammothidium acidoclinatum LM1
Length Range
8-16 µm
Width Range
4.4-5.8 µm
Striae in 10 µm
23-27

Psammothidium sacculus

(J.R. Carter) Bukhtiyarova 1996

Psammothidium sacculum LM5 Psammothidium sacculum LM3 Psammothidium sacculum LM4 Psammothidium sacculum LM6 Psammothidium sacculum LM2 Psammothidium sacculum LM7 Psammothidium sacculum LM1
Length Range
8-13 µm
Width Range
3.9-4.4 µm
Striae in 10 µm
26-30

Also compare to

Psammothidium ventrale

(Krasske) Bukht. and Round

BioData Reference
Krammer and Lange-Bertalot 2/4 Pl 24 Fig 8-22