Receptaculitids

I. Introduction.- Enigma of Problematic Fossil Taxa.- Terminology.- II. The Biography of an Idea.- Early Work.- Reports in English.- Rauff’s Analytical School.- Baltic Receptaculitids.- III. Geology.- Stratigraphic and Geographic Distribution.- Mineralogy.- Preservation.- IV. Morphological Characteristics of Fisherites orbis.- General Characteristics.- External Characteristics.- Internal Characteristics.- V. Morphology of a Merom.- Membrane.- Head.- Shaft.- Foot.- VI. Quaestio disputata: Morphological Reductionism.- Comparative Morphological Characteristics.- Axiomorph.- Skeleton.- Animals.- Plants.- VII. Summary and Beyond.- Receptaculitid Is But A Name.- Learning What They Are, Are Not, and Should Be.- Addendum. Horns of Dilemma: Phosphatization.- References.- Authors Index.- Taxonomic Index.