Macrosetella gracilis (Harpacticoid)
Collected at a depth of 20m below the surface at Salt River Canyon, St. Croix, U.S. Virgin Islands. Stained in Rose Bengal
Notes: This holoplanktonic harpacticoid copepod is widespread in warm oceanic waters, often associated with the large cyanobacterium Trichodesmim (see under phytoplankton in the gallery) upon which it feeds.
Collected by: W. S. Johnson