page_title: Argonauticeras
hierarchical_section_title: Argonauticeras
caption_attribution_description: English: phragmocone of Argonauticeras from Cretaceous deposits of Madagascar, median section Deutsch: Phragmokon eines Argonauticeras aus der Kreide von Madagaskar, Medianschnitt
context_page_description: Argonauticeras is an extinct ammonoid cephalopod genus that lived during the latter part of the Early Cretaceous, included in the Lytoceratida and found in lower and possibly middle Aptian marine sediments. It has been thought of as a subgenus of Ammonoceratites.
  Argonauticeras produced an evolute shell with a trapezoidal whorl section, slightly impressed inner rim, a somewhat flattened outer rim and broadly arched sides, covered with fine, weakly crinkled ribs.
context_section_description: Argonauticeras is an extinct ammonoid cephalopod genus that lived during the latter part of the Early Cretaceous, included in the Lytoceratida and found in lower and possibly middle Aptian marine sediments. It has been thought of as a subgenus of Ammonoceratites.
  Argonauticeras produced an evolute shell with a trapezoidal whorl section, slightly impressed inner rim (or dorsum), a somewhat flattened outer rim (venter) and broadly arched sides, covered with fine, weakly crinkled ribs.
caption: Argonauticeras from Madagascar
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