Further details on dimorphism in (Ammonoidea) from the Germanic Upper Muschelkalk (Middle Triassic), with revision of some species Weiteres über Dimorphismus bei Ceratites (Ammonoidea) aus dem Germanischen Oberen Muschelkalk (Mitteltrias) mit Revision einiger Arten

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Abstract:

Large collections from the from the Bauland Member (Upper Germanic Muschelkalk, Late Anisian) of the Crailsheim region in northern Wurttemberg of stratigraphically precisely dated Triassic ammonoids of the genus are described. The taxonomy of the species and is revised in a chronospecific and phylogenetic, rather than purely morphospecific, framework of classification. These chronospecies show a clear but not very prominent form of dimorphism, presumed to be sexual, analogous to that widely recognized in many other Jurassic and Cretaceous ammonites.

German
Umfangreiche Aufsammlungen von stratigraphisch genau datierten Ammonoideen der Gattung Ceratites werden aus den Baulandschichten (Oberer Germanischer Muschelkalk, Ober-Anisium) der Crailsheimer Gegend beschrieben. Die Taxonomie der Arten Ceratites angustus, C. raricostatus, C. robustus and C. transgressor wird revidiert. Diese Chronospecies weisen einen deutlichen aber nicht besonders ausgeprägten Dimorphismus auf, bei dem es sich vermutlich um Geschlechtsdimorphismus handelt, wie er bei vielen jurassischen und kretazischen Ammoniten bekannt ist.

Keywords: AMMONOIDEA; BIOSTRATIGRAPHY; CERATITES; DIMORPHISM; MACROCONCH; MICROCONCH; MIDDLE TRIASSIC; REVISION; UPPER MUSCHELKALK

Language: German

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2009/0251-0199

Publication date: February 1, 2009

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