Psammothidium daonense has larger valves and rhomboidal axial area on the rapheless valve. The valves of P. chlidanos are wider and more elongated. Psammothidium lacus-vulcani has an asymmetrical central area on the raphe valve and lacks a central area on the rapheless valve.

LM scalebar = 10 µm
Psammothidium subatomoides LM10 Psammothidium subatomoides LM2 Psammothidium subatomoides LM4 Psammothidium subatomoides LM6 Psammothidium subatomoides LM8
Length Range
5.5–11 µm
Width Range
3.2-6.0 µm
Striae in 10 µm

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

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

Also compare to

Psammothidium lacus-vulcani

(Lange-Bert. and Krammer) Bukht. in Bukht. and Round