Devonian ammonoids are interesting for a number of reasons.  They are the oldest
 representatives of the large group that existed from the Early Emsian substage
 until the end of the Cretaceous.  Devonian arnmonoids are diverse, and in the
 following catalogue nearly 1550 species within 250 genera and 57 families are
 listed.  They display a wide range of conch morphologies, of septal shapes and
 suture lines, and ornaments.  They evolved rapidly with numerous short-living
 species that represent excellent index fossils.

    Devonian ammonoids twice suffered from near-extinction and have long been
 used as a model system for the study of evolutionary biology.  They served as
 examples for the test of HAECKEL's law, for instance, and were used to illustrate
 arguments for and againstSCHINDEWOLF's Typostrophe Theory.

    Devonian ammonoids are popular among fossil collectors, and are even of
 commercial interest.  Many people in the Anti-Atlas of Morocco make a living
 from fossil mining, preparation, and merchandise.  Specimens of Devonian
 ammonoids are hence widely distributed and not only known to scientists.

    In this work, a new catalogue of Devonian ammonoid taxa will be intro-
 duced.  The data source for this volume is the Database system GONIAT
 (Tübingen), which was developed during the last twelve years (KORN &
 KULLMANN 1997; KULLMANN & KORN 2000), and which was funded by the
 Deutsche Forschungsgemeinschaft.