List of Contributors; 1. Introduction Alexandre K. Monro; 2. Cryptic species: A product of the paradigm difference between taxonomic and evolutionary species Simon J. Mayo; 3. Species circumscription in cryptic clades: A Nihilist's view Richard M. Bateman; 4. Multilevel organismal diversity in an ontogenetic framework as a solution for the species concept Alexander Martynov and Tatiana Korshunova; 5. Diagnosability and cryptic nodes in Angiosperms: A case study from Ipomoea Pablo Muñoz-Rodríguez, John. R. I. Wood and Robert W. Scotland; 6. Connecting micro- and macro-evolutionary research - extant cryptic species as systems to understand macro-evolutionary stasis Torsten H. Struck and José Cerca; 7. Coexisting cryptic species as a model system in integrative taxonomy Cene Fišer and Klemen Koselj; 8. Non-monophyletic species are common in plants: An ecological evolutionary perspective Matt Lavin and R. Toby Pennington; 9. Guerrilla taxonomy and discriminating cryptic species - is quick also dirty? Paul H. Williams; 10. Cryptic lineages among Seychelles herpetofauna Jim Labisko, Simon T. Maddock, Sara Rocha, David J. Gower; 11. Cryptic diversity in European terrestrial flatworms of the genus Microplana (Platyhelminthes, Tricladida, Geoplanidae) Marta Álvarez-Presas, Eduardo Mateos, Ronald Sluys and Marta Riutort.