Exam 2 Lecture 11
UIC BioS101 Nyberg
6
Anagenesis
¨Anagenesis, not mentioned in your text, refers to speciation (origin of new species) within a lineage.
¨Anagenesis acknowledges that the species of today, say coyotes, may be sufficiently different from the coyotes of some earlier time, say 90,000 ya, that they should be recognized as a separate species even though there is continuity of descent.
The criteria by which one defines species will probably make a lot of difference in how fast one perceives differences within a line at two different times.