Abstract
A key for the description of Palaeozoic ammonoids is presented. It contains a catalogue of descriptive terms to characterise conch morphology, ornament, and suture line particularly of Carboniferous ammonoids. A number of examples of tables and illustrations are given for the description of conch characters, their ontogeny and intraspecific variability. <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.200900008" target="_blank">10.1002/mmng.200900008</a>
Highlights
Palaeozoic ammonoids have been described for almost 200 years
A key for the description of Palaeozoic ammonoids is presented. It contains a catalogue of descriptive terms to characterise conch morphology, ornament, and suture line of Carboniferous ammonoids
There is a sort of consensus among ammonoid workers about the use of the various conch characters and their importance for ammonoid description and classification, there is no agreement on how species should be characterised in terms of diagnoses and illustrations
Summary
Palaeozoic ammonoids have been described for almost 200 years. Since the first nomination of the Carboniferous ammonoid “Ammonites Listeri” by Sowerby (1812), styles and contents of descriptions have significantly been modified and completed. There is a sort of consensus among ammonoid workers about the use of the various conch characters and their importance for ammonoid description and classification, there is no agreement on how species should be characterised in terms of diagnoses and illustrations It was Ruzhencev (e.g. 1956, 1960), who in a series of monographs, developed a standard for ammonoid descriptions accompanied by illustrations of representative specimens on plates, well-drawn suture lines of mature and often of juvenile stages, and occasionally conch cross sections. His diagnoses and descriptions of species followed a strict scheme, in which all the important characters were outlined. This key is coined for the Early Carboniferous ammonoids from Algeria, which will be described in monographs of this volume (Bockwinkel et al 2010; Ebbighausen et al 2010; Korn et al 2010a, 2010b, 2010c); it was developed mainly for Carboniferous ammonoids of the predominant suborder Goniatitina, which has a wide morphological range but very similar suture lines
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