The large yellowish dome-like creatures are single-celled phytoplankton known as diatoms (specifically Coscinodiscus sp. and Hemidiscus sp.). Those long Tetris-like chains of Skeletonema sp. are diatoms as well. But the bright pink spiky creatures are Protoperidinium depressum— dinoflagellates that eat diatoms. At the center of this image, next to the yellow star-shaped radiolarian, is a barnacle larva.
Tiny bubbles ... These pink bubbles are live planktonic foraminifera taken from the Sargasso Sea in the North Atlantic Ocean. Each set of bubbles is a single-celled creature that has built itself a protective, multichambered house called a test.