Trypanosomatids have been traditionally allocated to a number of genera tha
t were described based on morphological features and host range. Recently m
olecular studies have provided new data that has allowed a reexamination of
the genera. While in some cases the molecular data has been in agreement w
ith the morphological characters they have also reinforced existing doubts
about some current generic divisions as well as raising new concerns. A rev
ision of the trypanosomatid genera is required. Suggested features of such
a revision would include: (1) The possible division of Trypanosoma into new
genera to reflect the wide genetic diversity of this group; (2) The inclus
ion of Leishmania, Sauroleishmania and Endotrypanum within a single genus g
iven their high genetic affinity; (3) The complete revision of the monogene
tic typanosomatid genera to reflect monophyletic groups; (4) A more precise
redescription of Phytomonas so as to only include the monophyletic plant f
lagellates. (C) 2001 Australian Society for Parasitology Inc. Published by
Elsevier Science Ltd. All rights reserved.