This is a large species and very acrobatic. Size 9um wide, 55um long, total volume 21382.47. Temp. range 6.15 to 31.58C, salinity range 0 to 13.0ppt. Samples can be found throughout the year at one station or another. It seems to be more prolific in higher salinity rather than lower. These examples were in a sample from Muddy Creek in late August 2001 when the salinity was 12 to 13ppt. They were also found at most of the Rhode River stations and out into the Chesapeake Bay as well. The were quite large and active.