Systematics of the phylum Annelida has been drastically reorganized during the past few decades due to the application of results from molecular phylogenetic studies. Reveal your understanding of these changes and modern views of annelid systematics by describing (i) why some current members of Annelida were previously placed in separate phyla and (ii) how the current classification of annelids differs from the previous three-class scheme.
Added by Mar M.
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For example, the Echiura (spoon worms) were once classified as a separate phylum due to their lack of segmentation and unique proboscis structure. Similarly, the Pogonophora (beard worms) were also classified as a separate phylum due to their tube-dwelling Show more…
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