Average size is 150-450µ long, typically seen at 200µ, and 6-7µ wide. Total volume averages 5874.78. Temp. range 5 to 31.58C, salinity range 0 to 20ppt. Collected May to Dec. from all Rhode River stations and throughout the Chesapeake Bay. N. longissima is easily mistaken for Cylindrotheca closterium, the latter being the smaller of the two.