Bland J. Finlay, Philosophical Transactions of the Royal Society of London B, Biological Sciences
This is a review article on methods, concepts, and challenges in the field of protist taxonomy. Topics covered include an introduction to protist diversity and classification; the link between ultrastructure, morphology, and ecology; problems with the 'morphospecies' concept for protists; 'biological' or 'cohesion' species concepts; ecotypes as an alternative classification scheme; and two case studies exemplifying the author's theses. There is an extensive bibliography. This is a good resource for teachers and advanced students.
