Compare

Muelleria agnellus, M. gibbula and M. tetonensis are smaller in size. Muelleria portomontana has larger valves with parallel or slightly gibbous margins. Muelleria spauldingiana, a rare diatom of the maritime Antarctic region, has linear-lanceolate valves with capitate apices.

LM scalebar = 10 µm
Muelleria spauldingiae LM1 Muelleria spauldingiae LM2 Muelleria spauldingiae LM3 Muelleria spauldingiae LM4 Muelleria spauldingiae LM5 Muelleria spauldingiae LM6 Muelleria spauldingiae LM7
Length Range
28.8-66.2 µm
Width Range
11.7-15.0 µm
Striae in 10 µm
14-17 at valve center, 18-21 at the apices

Muelleria agnellus

Bahls 2014

Muelleria agnellus LM1 Muelleria agnellus LM2 Muelleria agnellus LM3 Muelleria agnellus LM4 Muelleria agnellus LM5 Muelleria agnellus LM6 Muelleria agnellus LM7
Length Range
26.9-59.6 µm
Width Range
9.5-12.3 µm
Striae in 10 µm
13-18 at valve center, 20-24 at the apices

Muelleria gibbula

(Cleve) S.A.Spauld. and Stoermer 1997

Muelleria gibbula LM6 Muelleria gibbula LM1 Muelleria gibbula LM5 Muelleria gibbula LM4 Muelleria gibbula LM7 Muelleria gibbula LM3 Muelleria gibbula LM2
Length Range
21.3-40.1 µm
Width Range
6.8-9.6 µm
Striae in 10 µm
18-22 at the valve center, 22-26 at the ends

Muelleria tetonensis

Bahls 2014

Muelleria tetonensis LM1 Muelleria tetonensis LM2 Muelleria tetonensis LM3 Muelleria tetonensis LM4 Muelleria tetonensis LM5 Muelleria tetonensis LM6 Muelleria tetonensis LM7
Length Range
27.2-52.6 µm
Width Range
8.6-11.7 µm
Striae in 10 µm
16-20 at valve center, 20-24 at the apices

Also compare to

Muelleria portomontana

(Cleve) Freng. 1945

Muelleria spauldingiana

Van de Vijver et al. 2014