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Fossil Record A palaeontological open-access journal of the Museum für Naturkunde
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Volume 19, issue 2
Foss. Rec., 19, 119-129, 2016
https://doi.org/10.5194/fr-19-119-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Foss. Rec., 19, 119-129, 2016
https://doi.org/10.5194/fr-19-119-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 09 Jun 2016

Research article | 09 Jun 2016

A new Late Jurassic halecomorph fish from the marine Vaca Muerta Formation, Argentina, southwestern Gondwana

Soledad Gouiric-Cavalli1,2 Soledad Gouiric-Cavalli
  • 1División Paleontología Vertebrados, Museo de La Plata, Universidad Nacional de La Plata, Paseo del Bosque s/n, W1900FWA La Plata, Argentina
  • 2CONICET, Avenida Rivadavia 1917, Ciudad Autónoma de Buenos Aires, Argentina

Abstract. The knowledge of Mesozoic fish faunas of the Southern Hemisphere is still inadequate; the diversity and evolution of the Late Jurassic marine ichthyofaunas of Argentina remain unclear. One fish recovered from the Tithonian levels of the Los Catutos Member of the Vaca Muerta Formation, southwestern Argentina was considered a "caturid-like" halecomorph for almost 30 years. Recently, it was proposed that it could belong to the Pachycormiformes. A thorough comparative anatomical study of the material is conducted to test whether it could be included in Caturidae or Pachycormidae. The specimen is assigned to Caturidae as a new genus and species: Catutoichthys olsacheri (http://zoobank.org/urn:lsid:zoobank.org:act:6884876C-075C-433B-90B7-74187FC04C26, registered on 1 June 2016). The new taxon is based on a unique character combination, three of which are exclusive to Catutoichthys olsacheri among caturids–diplospondylous vertebral column with triangular basidorsals and well-developed and fan-shaped basiventrals; neural and haemal spines strongly inclined to the body axis at an angle of 14°; a large number of infrahaemals; rounded amioid-type scales with an unornamented free field. The new taxon provides anatomical information useful for further understanding the anatomy and evolution of caturid fishes.

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Due to the fact that knowledge of Mesozoic fish faunas of the Southern Hemisphere is still inadequate and the diversity and evolution of the Late Jurassic marine fishes of Argentina remain unclear, I study a fish recovered from the Upper Jurassic sediments of southwestern Argentina. The fish anatomy was studied comparatively with other related forms. As result, a new taxon was created. The new taxon implies a broader knowledge of the ichthyofaunas of Gondwana.
Due to the fact that knowledge of Mesozoic fish faunas of the Southern Hemisphere is still...
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