BI256 Lecture Notes - Lecture 3: Phototroph, Giardia Lamblia, Foraminifera
Document Summary
250,000 protozoan species (64000 named species: protozoans defy tidy classification, despite apparent simplicity, protozoans are as complex as any metazoan, few other groups rival protozoans in economic importance. Protozoa : now used informally without implying phyletic relationship. Locomotion: undulipodia, cilia, flagella, pseudopodia, lobopodia: blunt, limax form: slug, filopodia: thin, reticulopodia: network, axopodia: thin central microtubule arrangement. Flagellar locomotion: a flagellum propels water parallel to the axis of attachment, shape maintained by pellicle (proteinaceous strips and microtubes) help maintain shape. Functional components of protozoan cells (cytoplasmic regions: cytoplasm colonial suspensions: solgel transformations, endoplasm, contains nucleus and cytoplasmic organelles, appears granular, ectoplasm, more transparent (hyaline, contains bases of cilia or flagella, often more rigid. Ameoboid locomotion: classic amoeboid locomotion uses cytoplasmic streaming and large blunt pseudopodia (lobopodia, endoplasm more fluid, more granular (contains organelles nucleus vacuoles etc, ectoplasm more rigid, more translucent, in a gel state.
