Found this big guy in a marine sample (possibly brackish). It was very fast and a challenge to document. When fully extended, it is around 180um long. Any thoughts as to an ID? EDIT: I think this may be
Amphileptus because of the large number of peritrichs also found in this sample.
63x/1.2 W C-apo DIC; no flash.

Images acquired on a Zeiss Axiovert 200M.