The Triassic ammonite Aristoptychites kolymensis (Kiparisova) from Botneheia, Spitsbergen |
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| Authors: | MEIKE KOHLER-LOPEZ ULRICH LEHMANN |
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| Institution: | Meike Kohler-Lopez and Dr. Ulrich Lehmann, Geologisch-Palaontologisches Institut und Museum der Universitat Hamburg, Bundesstrasse 55, D-2000 Hamburg 13, Germany;April 1983 (revised September 1983). |
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| Abstract: | Aristoptychites kolymensis (Kiparisova) is investigated and described in detail from collections made at Botneheia, Spitsbergen, where it occurs at the top of the Botneheia Formation (Daonella Shale). It is a rather small species and the stratigraphically highest representative of the genus in Spitsbergen. Its suture line is remarkable by its possession of the additional U.-lobes between the internal lobe and the first umbilical lobe. A lobe of this kind has so far been described only once, with Arcestes (Proarcestes) bicarinatus by Schindewolf (1968), which suggests affinities between Ptychitidae and Arcestidae. |
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