Dear colleagues, The English version of the PhD thesis of Dr. Eduard Degollada titled "*Functional anatomy and histology of the nasal sac system in odontocetes (superfamily Delphinoidea)*", is now publicly available. The original version in Spanish was translated to English to make its content available to the broad scientific community. Prologue to the English edition: "Although this PhD thesis was defended in 1998, personal commitments and limitations have led me to postpone publishing the different scientific advances the dissertation carried at that time. Since then, several papers have appeared, giving light to the complex anatomy of the odontocete sound production structures and mechanisms. At the same time, the main topics of what was presented in this dissertation are still unrevealed. This, and the fact that it was originally written in Spanish, made me decide to translate it into English to allow the scientific community access to its content. I would like to point out that there was no digital imagery at that time, as all was based on conventional photography and slides. I really think and hope the current publication will be useful for other anatomists or scientists in general, looking for a deeper insight into this subject. I would like to thank Steffen De Vreese for the translation, as he did not just translate the dissertation into English but needed a comprehensive understanding of the morphology and function described for a better interpretation and writing." The PDF can be accessed at: https://ddd.uab.cat/record/249577 Best wishes, Steffen De Vreese -- Steffen De Vreese, MVM, PhD Dipartimento di Biomedicina Comparata e Alimentazione (BCA) - Università degli Studi di Padova (It) Laboratori d'Aplicacions Bioacústiques (LAB) - Universitat Politécnica de Catalunya (Es) steffen.devreese@studenti.unipd.it steffen.de.vreese@upc.edu <steffen.devreese@lab.upc.edu> Linkedin.com/in/steffen-de-vreese-033a5994 Researchgate.net/profile/Steffen_De_Vreese Skype: devreesesteffen