Revision ofSemionotus bergeri
Agassiz, 1833 (Upper Triassic, Germany), with comments on the taxonomic status ofSemionotus (Actinopterygii, Semionotiformes). |
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Authors: | Adriana Löpez-Arbarello |
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Institution: | 1. Bayerische Staatssammlung für Pal?ontologie und Geologie, Richard-Wagner-Strasse 10, 80333, Munich, Germany
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Abstract: | Semionotus bergeri
Agassiz, 1833, from the Upper Triassic (Carnian) of southern Germany, the type species ofSemionotus, is here described in detail for the first time, including so far unstudied material in the Naturkunde-Museum Coburg, which
allows a fairly complète reconstruction of this fish. The species is diagnosed by the présence of long frontals, about 4 times
longer than wide, with antorbital lateral processes, 6–7 posterior infraorbitals, infraorbital at the posteroventral corner
of the orbit notably larger than adjacent ones, infraorbitals at the posterior border of the orbit being as deep as long,
and the middle élément anteroventrally expanded, dorsal fin base about two times the anal fin base.S. elegans from the Late Triassic-Early Jurassic of the Newark Supergroup in North America, is so far the best know species ofSemionotus and is the only species of this genus that has been included in phylogentic analyses. However, the comparison ofS. bergeri with other proposed speciesof Semionotus, such asS. elegans, and other semionotids casts doubt on the monophyly of this genus as currently understood, since these species exhibit a
mosaic distribution of characters.
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Keywords: | Semionotus Semionotiformes Neopterygii Upper Triassic Coburger Sandstein Hassberge Formation Germany |
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