Diatoms of North AmericaDiatoms of North America
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Compare Rossithidium nodosum

(A.Cleve) Aboal 2003

Compare

Rossithidium nodosum can be distinguished from A. minutissimum by its wider valves and broader striae. Rossithidium kriegeri possesses more narrow valves and an asymmetrical central area. Rossithidium pusillum is more broad, and is generally greater in length. The striae density is also greater (24 in 10 µm) and the striae are uniseriate.

LM scalebar = 10 µm
Rossithidium nodosum LM10 Rossithidium nodosum LM8 Rossithidium nodosum LM2 Rossithidium nodosum LM6 Rossithidium nodosum LM4
Length Range
9.0-11.9 µm
Width Range
2.9-3.3 µm
Striae in 10 µm
16-20

Rossithidium kriegeri

(Krasske) Bahls 2019

47 Lm1 47 Lm5 47 Lm3 47 Lm4 47 Lm6 47 Lm2 47 Lm7
Length Range
6–21 µm
Width Range
2.1-2.9 µm
Striae in 10 µm
21-23

Achnanthidium minutissimum

(Kütz.) Czarn. 1994

Achnanthidium minutissimum LM4 Achnanthidium minutissimum LM3 Achnanthidium minutissimum LM7 Achnanthidium minutissimum LM2 Achnanthidium minutissimum LM6 Achnanthidium minutissimum LM1 Achnanthidium minutissimum LM5
Length Range
5.6-20.8 µm
Width Range
1.5-3.3 µm
Striae in 10 µm
25-35

Rossithidium pusillum

(Grunow) Round and Bukht. 1996

Rossithidium pusillum LM6 Rossithidium pusillum LM8 Rossithidium pusillum LM10 Rossithidium pusillum LM2 Rossithidium pusillum LM4 Rossithidium pusillum LM12
Length Range
10–16 µm
Width Range
3.1-4.1 µm
Striae in 10 µm
20-24