An Evaluation of a Possible Phylogenetic Relationship Between the Euglenophyta and Kinetoplastida

Without close phylogenetic ties to any of the other algae, the Euglenophyta are a taxonomic enigma. The argument is made here that the euglenophytes have extensive morphological homology with the zooflagellate trypanosomatids, bodonids, and Isonema. A phylogenetic sequence is postulated linking these groups; the available data suggest that the euglenophytes had their origin in these zooflagellates and that the introduction of the chloroplast and...