GEOL 107 Lecture Notes - Lecture 5: Willi Hennig, Protist, Motility

• School: Queen's University
• Department: Geological Sciences and Geological Engineering
• Course: GEOL 107
• Professor: Guy M Narbonne

Document Summary

Approximately 2 million living species have been described, and the number of undescribed living species is estimated to be perhaps 5 times that number. Including described and undescribed fossil species would increase that number even further. Most living species are animals (approximately 1,160,000 described species, of which more than. 80% are insects), followed by plants (270,000 species) and algae (40,000 species), fungi (72,000 species), bacteria and archaea (4,000 species) and viruses (1500 species). In our last lecture, we saw that evolution is the major force and linkage through all of biology. Biological classification of organisms must reflect evolutionary history (phylogeny) A fundamental division is between prokaryotes and eukaryotes. Prokaryotes - unicellular, lack a cell nucleus or organelles (e. g. chloroplasts, mitochondria; Eukaryotes - unicellular or multicellular, dna in a nucleus, contain organelles (cowen, 2013, Linnean classification based on hierachy proposed by carl von linn in 1735-58. Three domains (sometimes called superkingdoms ) distinguished mainly on differences in.