Problematic Fossil Taxa

Stefan Bengtson: Introduction: the problem of the Problematica; Jack A Babcock: The puzzle of the alga-like Problematica, or rummaging around in the algal wastebasket; Matthew H Nitecki: Receptaculitids and their relationship to other problematic fossils; Andrey Yu Zhuravlev: Radiocyathids; Ellis L Yochelson & Richard H Lindemann: Considerations on systematic placement of the styliolines (Incertae sedis: Devonian); Mikhail A Fedonkin: Precambrian problematic animals: their body plan and phylogeny; George D Stanley Jr: Chondrophorine hydrozoans as problematic fossils; A Yu Rozanov: Problematica of the Early Cambrian; Stefan Bengtson, S Crosbie Matthews, & Vladimir V Missarzhevsky: The Cambrian netlike fossil; Jerzy Dzik: Turrilepadida and other Machaeridia; Loren E Babcock & Rodney M Feldmann: The phylum Conulariida; Barry D Webby: Early stromatoporoids; Derek E G Briggs & Simon Conway Morris: Problematica from the Middle Cambrian Burgess Shale of British Columbia; Adam Urbanek: The enigma of graptolite ancestry: lesson from a phylogenetic debate; Richard J Aldridge & Derek E G Briggs: Conodonts; Jerzy Dzik: Chordate affinities of the conodonts; Indexes.