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Synedra goulardii is shorter than Ulnaria contracta, has a more dramatically constricted central area and more apiculate ends.

LM scalebar = 10 µm
Synedra goulardi LM4 Synedra goulardi LM3 Synedra goulardi LM2 Synedra goulardi LM1 Synedra goulardi LM5 Synedra goulardi LM6 Synedra goulardi LM7
Length Range
55-103 µm
Width Range
8.5-10.5 at center; 8.6-12.4 at maximum µm
Striae in 10 µm
9-12

Ulnaria contracta

(Østrup) E.Morales and M.L.Vis 2007

Ulnaria contracta LM2 Ulnaria contracta LM4 Ulnaria contracta LM6 Ulnaria contracta LM3 Ulnaria contracta LM1 Ulnaria contracta LM5 Ulnaria contracta LM7
Length Range
65-149 µm
Width Range
6.5-6.8 µm
Striae in 10 µm
10-12