The work was performed primarily at the Zoological Institute, Russian Academy of Sciences (St. Petersburg) using the museum's collections, but it proved impossible without access to the collections of other museums and institutes.
I thank my colleagues for their help in obtaining material for study. I am particularly grateful to Academician M.E. Vinogradov (Institute of Oceanology, Moscow) and to Dr. M.V. Heptner (Zoological Museum of the Moscow State University) for placing at my disposal the unique collection of deepwater plankton catches obtained during the cruises of the R/V "Vitjaz".
In this work I also used material from the N.M.N.H. (Smithsonian Institute, Washington D.C.), and I am very grateful to Dr. F.D. Ferrari for lending this collection to me.
In the final stages of my investigations the opportunity arose to examine the collection of Aetideidae identified by G.O. Sars, housed in the Zoological Museum of Oslo. Type specimen of Aetideidae (except for Pseudochirella spectabilis Sars, 1900) were not designated but all specimen were originally identified by Sars and are still labeled with Sars's original hand-written labels. This makes it possible to understand how Sars himself comprehended each species. During the work on this collection many questions which had arisen could be resolved. I am very grateful to Prof. M. Christiansen (Zoological Museum, University of Oslo) for giving me the opportunity to work with this collection.
Illustrations were taken from a variety of publications and the author especially wishes to thank Dr. Tai Soo Park and Dr. Janet M. Bradford-Grieve for granting permission to include illustrations from their many fine works. Permission was also granted by the publishers of the following publications: Bolletim Zoologia (Prof. Elizabeth Höfling, Universidade de São Paulo, Brasil); Bulletin of the Museum of Comparative Zoology (Michael Jackson, Harvard University, Cambridge, Massachusetts, U.S.A.); Bulletin of the U.S. National Museum (Dr. Frank Ferrari, National Museum of Natural History, Washington D.C., U.S.A.); Ciêncas Cultural, São Paulo (Luiz R. Travassos, São Paulo, Brasil); Crustaceana (Koninklijke Brill N.V., Leiden, The Netherlands); Hydrobiologia (Berendina van Straalen, Kluwer Academic Publishers, Dordrecht, The Netherlands); Journal of Zoology, London (April Boffin, Oxford University Press, Oxford, U.K.); Mitteilungen des hamburger zoologisches Museum und Instituts (Dr. Knud Schultz, Universität Hamburg, Hamburg, Germany); Pacific Science (Keith K. Leber, University of Hawaii Press, Honolulu, Hawaii, U.S.A.); Publications of the Seto marine biological Laboratory (Prof. Shin Kubota, Kyoto University, Japan); Sarsia (Ulf Båmstedt, University of Bergen, Norway); Zoologische Verhandelingen, Leiden (Marc de Hart, Naturalis, N.N.M., Leiden, The Netherlands).
For the electronic version the separate keys of the original publication were updated into a single, fully illustrated key by the author and Henk Visser MSc. of the Expert Center for Taxonomic Identification (ETI). Additional information on higher taxa was compiled by Dr. Julia Kouwenberg and reworked by Huub Veldhuyzen van Zanten. Additional illustrations were made by Sasja van Meel MSc. Digital formatting of the text and illustrations by ing. Taghi Zandvakili.