Jaeniceras, a new genus of Tithonian ammonites based on Perisphinctes ponti Fallot & Termier
Keywords:
Jaeniceras ponti nov. gen., females and males, homoeomorphy, Djurjuriceras, “Burckhardticeras”, Tithonian, Betic RangeAbstract
Based on the holotype of Perisphinctes ponti Fallot & Termier and new well-preserved specimens from southern Spain, the new genus Jaeniceras is introduced. The genus includes a group of distinctive Tethyan ammonites the females of which have been considered as belonging to the genus Djurjuriceras Roman, and the males to “Burckhardticeras” Olóriz . The partial homoeomorphy between these ammonites is here resolved by the study of their sexually-dimorphic sculpture ontogeny and morphology. Jaeniceras nov. gen. was distributed along the Central Tethys during the late Early Tithonian Ponti Zone. It seems possible that the new genus originated from some representative of the Andean lineage Catutosphinctes Leanza & Zeiss migrating along the Caribbean-North Atlantic seaway during the Fallauxi Zone.Downloads
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