Phylogenetic context and Basal metazoan model systems.

@article{Collins2005PhylogeneticCA,
  title={Phylogenetic context and Basal metazoan model systems.},
  author={Allen G Collins and Paulyn Cartwright and Catherine S McFadden and B. Schierwater},
  journal={Integrative and comparative biology},
  year={2005},
  volume={45 4},
  pages={585-94}
}
In comparative studies using model organisms, extant taxa are often referred to as basal. The term suggests that such taxa are descendants of lineages that diverged early in the history of some larger taxon. By this usage, the basal metazoans comprise just four phyla (Placozoa, Porifera, Cnidaria, and Ctenophora) and the large clade Bilateria. We advise against this practice because basal refers to a region at the base or root of a phylogenetic tree. Thus, referring to an extant taxon or… CONTINUE READING

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