Fossil Record 19(2): 119-129, doi: 10.5194/fr-19-119-2016
A new Late Jurassic halecomorph fish from the marine Vaca Muerta Formation, Argentina, southwestern Gondwana
expand article infoSoledad Gouiric-Cavalli
‡ CONICET, Avenida Rivadavia 1917, Ciudad Autónoma de Buenos Aires, Argentina
Open Access
Abstract
The knowledge of Mesozoic fish faunas of the SouthernHemisphere is still inadequate; the diversity and evolution of the LateJurassic marine ichthyofaunas of Argentina remain unclear. One fishrecovered from the Tithonian levels of the Los Catutos Member of the VacaMuerta Formation, southwestern Argentina was considered a "caturid-like"halecomorph for almost 30 years. Recently, it was proposed that it couldbelong to the Pachycormiformes. A thorough comparative anatomical study ofthe material is conducted to test whether it could be included in Caturidaeor Pachycormidae. The specimen is assigned toCaturidae 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 aunique character combination, three of which are exclusive to Catutoichthys olsacheri among caturids–diplospondylousvertebral column with triangular basidorsals and well-developed andfan-shaped basiventrals; neural and haemal spines strongly inclined to thebody axis at an angle of 14°; a large number of infrahaemals; rounded amioid-type scaleswith an unornamented free field. The new taxon providesanatomical information useful for further understanding the anatomy andevolution of caturid fishes.