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1000
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Abstract/Summary
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<jats:title>Abstract</jats:title><jats:p>In the revised ammonoid biostratigraphy of Becker (1993), the base of the German Hemberg-Stufe (Hembergian, middle Famennian, Upper Devonian III) was defined by the entry of <jats:italic>Pernoceras dorsatum</jats:italic> (Wedekind, 1918). However, this taxon is an invalid junior homonym of <jats:italic>Tornoceras simplex</jats:italic> var. <jats:italic>dorsata</jats:italic> Gürich, 1900 and Wedekind`s form was poorly defined and originally not illustrated. Based on a review of Wedekind material and unpublished collections from two trenches at the Enkeberg type section, the defining taxon of the Hembergian is re-assigned to <jats:italic>Protornoceras genulobatum</jats:italic> (Sobolew, 1914b). The species is discussed in the context of previous records of <jats:italic>Tornoceras dorsatum</jats:italic> and in the taxonomic framework of the Aulatornoceratinae, especially of the genera <jats:italic>Protornoceras</jats:italic> and <jats:italic>Pernoceras</jats:italic>. In the revised regional and international zonation scheme, UD III-A becomes a regional <jats:italic>Prot. genulobatum</jats:italic> Zone and international <jats:italic>Protornoceras</jats:italic> Genozone. Some other <jats:italic>Protornoceras</jats:italic>, questionable <jats:italic>Falcitornoceras</jats:italic>, and <jats:italic>Pernoceras</jats:italic> are described. These include <jats:italic>Prot. rhenicum</jats:italic> n. sp., <jats:italic>Prot. umbilicatoides</jats:italic> (Sobolew, 1914a)<jats:italic>, </jats:italic><jats:italic>Prot.</jats:italic> aff. <jats:italic>delepinei</jats:italic> (Petter, 1975), and <jats:italic>Prot.</jats:italic> aff. <jats:italic>crebriseptum</jats:italic> (Raymond, 1909) from the Enkeberg, <jats:italic>Prot.</jats:italic> aff. <jats:italic>genulobatum</jats:italic> from Beringhauser Tunnel<jats:italic>,</jats:italic> the Rhenish <jats:italic>Perno. kochi</jats:italic> (Wedekind, 1908), and the Russian <jats:italic>Pernoceras kirsaense</jats:italic> n. sp.</jats:p>
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