Light micrographs (LM) of Auranticordisquadriverberis n. gen. et sp. showing cell color, main cytoplasmic components, and variation in cell shape. A. Differential interference contrast (DIC) image focused on rows of longitudinally arranged orange muciferous bodies (arrowhead), the ventral groove (double arrowhead), lobe 1 (L1), a ventral depression (vd), L2, L3, and L4. B. An inverted heart-shaped cell with visible flagella (arrow) emerging from the posterior region of the ventral groove. C. A flattened cell showing larger pale orange bodies (putative primary endosymbionts, arrowheads) distributed in the anterior end of the cell. D. DIC image showing the position of the ventral groove (double arrowhead) with flagella (arrow) relative to a prominent L1 and L4. E. Phase contrast micrograph demonstrating the distal end of the flagella emerging from the ventral groove. F. DIC micrograph showing black bodies (asterisk) accumulated at the anterior end of the cell and two pale orange bodies (putative primary endosymbionts, arrowheads). G. A squashed cell showing the anterior nucleus (N) and flagella (arrow). H. DIC micrograph showing a cell with prominent lobes. I. A squashed cell showing variation in the shape and size of the pale orange bodies (putative primary endosymbionts, arrowheads). (A-I, Bar = 10 μm).