Kingdom Protista- The Marine Protozoans All have a form of locomotion Heterotrophs Eukaryotic Known a zooplankton

Zooplankton- tiny, floating organisms that are small animals or protozoa

2 major groups of zooplankton Holoplankton- spend entire life as plankton Meroplankton- spend larval stage as plankton

3 unusual zooplankton Foraminiferans Radiolarians Ciliates

Foraminiferans Shell called a test. Test is made of Calcium carbonate (chalk) Has a pseudopod- extensions of the cytoplasm Huge deposits of tests found

Radiolarians Ciliates Have hair-like cilia to provide locomotion or feeding Radiolarians Similar to foraminiferans Shells are made of silica Needle-like pseudopods Most geologists believe that the famous White Cliffs of Dover were once under water. Why? They are composed mostly of foraminiferan tests. Since these marine zooplankton create extensive deposits on the ocean floor, it is reasonable to assume that the cliffs were once on the ocean floor as well.