polyphyletic group

A polyphyletic group is a taxonomic classification that includes organisms from different ancestral lineages, rather than a single common ancestor and all of its descendants. This contrasts with monophyletic groups (clades), which consist of an ancestor and all its descendants.12

Phylogeny, the study of evolutionary history and relationships, is fundamental to taxonomy, the science of classifying organisms. While phylogenetic trees are hypotheses based on indirect evidence, they are crucial for understanding evolution. Modern taxonomy aims to reflect these evolutionary relationships, though challenges arise from incomplete fossil records and convergent evolution where similar traits evolve independently. Different methods, like cladistics, focus on shared derived characteristics (synapomorphies) to infer evolutionary relationships.3245