Compare

Muelleria terrestris has smaller valves (< 9 µm wide). Muelleria gibbula has smaller valves and a gibbous central margin. The valves of M. spauldingiae are elliptic while those of M. tetonensis are linear-elliptic with parallel margins. While similar in shape, valves of M. regigeorgiensis are smaller, and stria density is higher near the valve ends.

LM scalebar = 10 µm
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 spauldingiae

Bahls 2014

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 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 terrestris

(J.B.Petersen) S.A.Spauld. and Stoermer 1997

Muelleria regigeorgiensis

Van de Vijver and S.A.Spauld. 2010