This monograph is the first volume of the "Fauna Iberica" series that is dedicated to the Polychaetous Annelids. This volume is entirely devoted to the family Syllidae; small, very common annelids that are abundant in all types of littoral settings, especially at low depths in marine environments.
This book provides a synthesis of all that is known about this family on the Iberian and Balearic coasts, as well as in areas of Spanish North Africa. The reader can get information on the morphologic and biological characters of this family, use dichotomic keys to identify all the genera and species currently known on the Iberian area and check these identifications with diagnostic and detailed descriptions of each taxon. There are plates of drawings and SEM photographs of most species and 281 illustrations of the 161 species studied in this monograph.
The reader should be aware that this family of polychaetes is currently being revised by the current author and by other contributing authors. Consequently, there may be changes in nomenclature and classification over the next few years.

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