Portrait of Sphaerophrya
, a spherical suctorian, which floats, free without lorica or stalk. There are evenly distributed capitate tentacles over the body surface. The tentacles retract with a typical accordion appearance (seen in this image at the 2 o clock position). There is a large centrally placed coarsely granular macronucleus and a single contractile vacuole. Some species are parasitic. Sphaerophrya
preys on ciliates. From standing freshwater in Typha
(cattail) marsh near Boise, Idaho. Differential interference contrast. Differential interference contrast optics.