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Actinella punctata is the only species of Actinella reported in North America. Actinella punctata can be differentiated from species within the genus Eunotia species by its heteropolar valve shape and from Peronia species by the position of the raphe branches on the ventral face of the mantle at the proximal ends.

LM scalebar = 10 µm
Actinella punctata LM5 Actinella punctata LM6 Actinella punctata LM6 Actinella punctata LM3 Actinella punctata LM2 Actinella punctata LM1 Actinella punctata LM4
Length Range
36-169 µm
Width Range
headpole 6.5-12; footpole 3-6.5 µm
Striae in 10 µm
12-20

Peronia fibula

(Bréb. ex Kütz.) R.Ross 1956

Peronia fibula LM3 Peronia fibula LM7 Peronia fibula LM4 Peronia fibula LM2 Peronia fibula LM1 Peronia fibula LM5 Peronia fibula LM6
Length Range
26.6-53.8 µm
Width Range
3.0-6.0 µm
Striae in 10 µm
18-22