What is anagenesis? Give an example from the Caminalcules evolutionary tree? Also take a moment to consider what an organism's position on the horizontal axis denotes. This topic as alluded to briefly as part of the Lab Introduction (Figure 2, p. 2) but What does it mean if two species to be further spaced apart on the horizontal axis of this phylogenetic tree? NOTE: Changes in horizontal position are only generally observed (required) for cladogeneis not anagenesis.