BIO153H5 Lecture Notes - Lecture 8: Radiolaria, Symbiogenesis, Protist
Document Summary
Protist diversity: we"ll be discussing organisms that have been classified as the most abundant. Radiolarian: common in marine environments, predatory, have glass skeleton, snow-flake appearance that differs from one to another, have pseudopods: arterial limbs to allow the animal to move around. Foraminiferans: example of early marine protists, have shells called tarius shells instead of glass, they"re made of calcium carbonate. Cercozoans: unusual group, most are heterotrophs but have the capacity to photosynthesize, a number of them are predatory, the group is problematic, up until the last decade, cercozoans was not recognized as a clade. All the current members were placed in different groups. Red algae: different pigments for photosynthesis than green algae, lack flagella, they"re floaters. Variation in life cycles: critical for success of these forms, the most important thing is that this alternation of generation takes place among all protists.
