Caption
Sexual reproduction in E. reimeri may follow Geitler's Type IA1a (Fig C, D) or possibly Type IC (Fig. B). Two parental cells are paired ventral to ventral within a common copulation mucilage that is further covered in organic and mineral debris (Fig. A). Each parental cell appears to produce two gametangia that are released into the mucilage for pairing. The two resultant auxospores undergo expansion and silicification to become initial cells, but it was unclear if there was a distinct orientation (parallel or non-oriented) to the parental cells.
