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Compare Psammothidium helveticum

(Hust.) Bukht. and Round 2007

Compare

Psammothidium helveticum differs from P. bioretii and P. daonense by its linear-elliptical valves. Valves of P. bioretii and P. daonense are elliptical, except for the longest specimens of P. daonense. Psammothidium helveticum differs from P. daonense and P. chlidanos by having long terminal raphe fissures curved to opposite sides. Psammothidium helveticum also differs from all these three species by its large rounded central area on the rapheless valve.

LM scalebar = 10 µm
Gs100739 Pshelv 2A Ed Gs100739 Pshelv 2B Ed Gsl00810 13A Ed Gsl00810 6A Ed Gsn23403 1A Gsn23403 1B Gs100739 Pshelv 3B Ed
Length Range
12-26 µm
Width Range
5.1-7.8 µm
Striae in 10 µm
24-30

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 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