GEOL 105 Lecture Notes - Lecture 2: Chronospecies, Anagenesis, Cladogenesis
21 Jan 2020
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Linnaean taxonomy: taxonomy- system of naming/classification, kingdom, phylum, class, order, family, genus, species, ranked taxonomy- each group is nested, rigid framing ok for classifying modern species. Biological species: a group of organisms that can interbreed and produce viable offspring. Morphological species: a group of organisms with similar internal/external anatomy. Phylogenetic species: populations that cluster together on an evolutionary tree are considered a species. Speciation (cladogenesis): a lineage branches into two lineages. Anagenesis: evolution between branching events - anatomical changes within an unbranching lineage = chronospecies. Chronospecies: anagenesis can also describe stratigraphically separated species - rungs on a ladder . Gradualism: species change and branch slowly and continuously throughout earth history- darwin"s original hypothesis.
