A new species of Saurichthys (Actinopterygii) from the Middle Triassic (Early Ladinian) 0f the Northern Grigna Mountain (Lombardy, Italy)

Rivista Italiana di Paleontologia e Stratigrafia (Impact Factor: 0.93). 11/2013; 119(3):287.

ABSTRACT A new species of Saurichthys is described. It comes from a Early Ladinian fossil-bearing bed lying in the middle-lower part of the Buchenstein Formation on the Northern Grigna southern slope (Pasturo, Lecco). This new species differs from the several other Middle Triassic species in the remarkable size (more than 130 cm in length), in the presence of a grid structure made by the dorsal elements of its vertebral column, and in the posteriorly enlarging endoskeletal elements of both dorsal and anal fins. Moreover, only two longitudinal scale rows distinguish this taxon; together with the grid structure of the dorsal vertebral column, this character was previously observed only in Norian species (Late Triassic). The early appearance of these features in a Ladinian species opens a new, serious discussion on the evolutionary trends of Saurichthys, which is a very important genus, inhabiting the seas and lakes all over the world from the latest Permian to the end of the Triassic.

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    ABSTRACT: The Saurichthys card provides a short overview about the long slender ray-finned fossil actinopterygian saurichthyids comprising systematic paleontological profile, morphology and palaeoecology. Moreover, a stratigraphic and geographic distribution of all currrently known 64 valid Saurichythid species is given from the Late Permian to the Early Jurassic (per November 2014).
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    ABSTRACT: Saurichthys, characterized by a long slender body and an elongated rostrum, is one of the most iconic genera of Late Paleozoic–Early Mesozoic fishes. The genus was particularly speciose in the Triassic, with a global distribution in both marine and freshwater habitats. Here, we describe two new species from the Middle Triassic Besano Formation of Monte San Giorgio, Switzerland, Saurichthys breviabdominalis sp. nov. and Saurichthys rieppeli sp. nov. S. breviabdominalis is characterized by a proportionately long operculum, short abdominal region and rib-like mid-lateral scales, whereas S. rieppeli is divergent from other Middle Triassic saurichthyids in the block-like haemal arches, fringing fulcra on the pelvic and unpaired fins, and reduction of the squamation to a single row in the abdominal region. Phylogenetic analysis places S. rieppeli in a basal position relative to congeners from the Alpine Triassic, and supports previous hypotheses regarding the convergent evolution of reduced squamation within saurichthyids. S. breviabdominalis forms a monophyletic group with species from the same locality, suggesting divergence in sympatry. This finding has implications for our understanding of disparity and character evolution in saurichthyid fishes, as well as ecomorphological divergence and resource partitioning between closely related fishes in Triassic marine ecosystems.
    Zoological Journal of the Linnean Society 03/2015; 173(4):887 - 912. DOI:10.1111/zoj.12224 · 2.66 Impact Factor
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    ABSTRACT: Diese Saurichthys-Übersichtskarte faßt in deutsch auf beiden Seiten kompakt alles wissenswerte zu den charakteristisch langestreckten Saurichtyhiden (Strahlenflosser) zusammen. Neben einem kurzen Steckbrief zur systematischen Paläontologie dieser Knochenfische, Morphologie und Paläoökologie wird die zeitliche und geographische Verbreitung aller derzeit bekannten 64 Saurichthyiden-Arten dokumentiert.


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May 31, 2014