Additional file 6.

Scanning electron micrographs of thalassiosiroid diatoms in the type material (Additional file 4) of Cyclotella nana (= Thalassiosira pseudonana): Stephanodiscus hantzschii Grunow (A, B), Stephanodiscus minutulus (Kützing) Cleve & Möller (C, D), Discostella pseudostelligera (Hustedt) Houk & Klee (E-H), Cyclotella striata (Kützing) Grunow in Cleve & Grunow (I), Cyclotella atomus Hustedt (J), Cyclotella meneghiniana Kützing (K,L), Cyclostephanos invisitatus (Hohn & Hellerman) Theriot, Stoermer & Håkansson (M), Shionodiscus sp. (N), Thalassiosira sp. 1 (O), Thalassiosira sp. 2 (P). Scale bar = 2 μM.

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Alverson et al. BMC Evolutionary Biology 2011 11:125   doi:10.1186/1471-2148-11-125