While dixenous trypanosomatids represent one of the most dangerous pathogens for humans and domestic animals, their monoxenous relatives have frequently become model organisms for studies of diversity of parasitic protists and host-parasite associations. Yet, the classification of the family Trypanosomatidae is not finalized and often confusing. Here we attempt to make a blueprint for future studies in this field. We would like to elicit a discussion about an updated procedure, as traditional taxonomy was not primarily designed to be used for protists, nor can molecular phylogenetics solve all the problems alone. The current status, specific cases, and examples of generalized solutions are presented under conditions where practicality is openly favored over rigid taxonomic codes or blind phylogenetic approach.

Biology Centre Institute of Parasitology Czech Academy of Sciences 370 05 České Budějovice Czech Republic; Canadian Institute for Advanced Research Toronto ON M5G 1Z8 Canada

Coleção de Protozoários Instituto Oswaldo Cruz Fundação Oswaldo Cruz 21040 360 Rio de Janeiro Brazil

Department of Biology University of California Riverside Riverside 92521 USA

Department of Parasitology Faculty of Science Charles University 128 44 Prague Czech Republic; Biology Centre Institute of Parasitology Czech Academy of Sciences 370 05 České Budějovice Czech Republic

Life Science Research Centre University of Ostrava 710 00 Ostrava Czech Republic; Biology Centre Institute of Parasitology Czech Academy of Sciences 370 05 České Budějovice Czech Republic; Department of Pathology Albert Einstein College of Medicine Bronx NY 10461 USA

UMR 7245 MCAM Muséum National d'Histoire Naturelle CNRS Sorbonne Universités 75005 Paris France

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