Topics New classification Aspects of diversity Representatives in taxa
Ch. 26, Protists p. 537 Five eukaryote clades Protists – a complex polyphyletic group/kingdom related to several other kingdoms – ultrastructural and molecular data helped do the above new classification Study 26-1 table (p.538 in text)
Kingdom - Protista Eukaryotic, mostly unicellular and aquatic Ch. 26, Protists pp. 534-535. Kingdom - Protista Eukaryotic, mostly unicellular and aquatic Some - colonial (loosely connected cells) Some - simple multicellular bodies without “specialized tissues” Very diverse informal Kingdom – diverse in structure, locomotion, reproductive strategies, nutrition, life styles, habitats, life histories etc. Three conventional groups Protozoa Algae Water molds and slime molds
Ch. 26, Protists pp. 534-535. Diversity Structure: Number of nuclei, types of organelles, cell surfaces Locomotion: Amoeboid, cilliary, flagellar, combined Reproduction: Mostly asexual, sexual too (syngamy) Nutrition: Algae - photoautotrophic; others - saprobic (water and slime molds), heterotrophic (Protozoa), facultatively heterotrophic Lifestyles: Free living, symbiotic (mutualism, commensalism, parasitism), pathogenic Habitats: Fresh water, marine, planktons, damp terrestrial Life Histories: Polyphyletic group
Euglena - Mixotrophic Euglenozoans - Excavates
Ceratium - Mixotrophic Dinoflagellates - Chromalveolates with a test
Diatoms – photosynthetic Heterokontophytes - unicellular with geometric tests - Chromalveolates
Amoeba – amoeboid protozoan Amoebozoans - Unikonts
Trypanosoma – intercellular parasitic flagellated Euglenozoans - African sleeping sickness - Excavates
Plasmodium - intracellular parasitic protozoan –Apicomplexans - Malaria - Chromalveolates
Paramecium - ciliated predatory protozoan – Ciliophorans - Chromalveolates
Test forming Foraminiferans - Rhizarians
Stentor – Ciliated protozoans Ciliophorans - Chromalveolates
Brown algae – Fucus, Macrocystis - large multicellular photosynthetic Phaeophytes - Chromalveolates