Animal-like Protists: The Protozoa Chapter 8

Protists The taxonomic kingdom Protista is a collection of single-celled organisms that do not fit into any other category. Protists are a group made up of protozoa, unicellular algae, and slime molds.

Maintaining Homeostasis Protists use microtubulues to maintain their shape. This arrangement of microtubulues is called the pellicle. Protists use contractile vacuoles to expel water as needed. Food is ingested through the cytopharynx (some protists) and digestion takes place in vacuoles. Watch it!

Reproduction The most common form of reproduction for protists is binary fission.binary fission Other types of reproduction include budding and schizogony (multiple fission).buddingschizogony (multiple fission). Reproduction can be either sexual or asexual. Which type is which?

Classification Originally, protists were classed by locomotion type. Now, cladistics is used to classify protists based on evolutionary relationships. There are four Super Groups of protists.

The Super Groups Excavata – flagellated with cytosome (ex. Giardia) Amoebozoa – locomotion using pseudopodia; tubular cristae in mitochondria (ex. Amoeba) Rhizaria – locomotion by thin pseudopodia (ex. Difflugia) Chromalveolata – contains plastids (ex. Toxoplasma, Cryptosporida, Plasmodium)

Giardia Amoeba Difflugia Cryptosporidium Toxoplasmosis Plasmodium