These cells are frequently found solitary but can be found in the interesting chain formation shown above on left. This sample came from a 20u plankton tow in the lower Patuxent River near Solomons Island, MD in October 2002. Salinity at the time was 20ppt. The photo below came from a sample taken from the main bay area several years ago. See Horner and Tomas in Taxonomic References.