A NEW COELACANTH SPECIMEN WITH ELONGATE RIBS FROM THE MIDDLE TRIASSIC (LADINIAN) KALKSCHIEFERZONE OF MONTE SAN GIORGIO (CANTON TICINO, SWITZERLAND)

Authors

  • SILVIO RENESTO Dipartimento di Scienze Teoriche ed Applicate, Università degli Studi dell’Insubria, Varese, Italy.
  • FABIO MAGNANI Repubblica e Cantone Ticino, Dipartimento del territorio, Museo cantonale di storia naturale, Viale Carlo Cattaneo 4, Lugano, Switzerland.
  • RUDOLF STOCKAR Repubblica e Cantone Ticino, Dipartimento del territorio, Museo cantonale di storia naturale, Viale Carlo Cattaneo 4, Lugano, Switzerland.

DOI:

https://doi.org/10.13130/2039-4942/16731

Keywords:

Actinistia; Middle Triassic (Ladinian); Kalkschieferzone Limestone; Description.

Abstract

A new finding of a coelacanth from the upper Ladinian upper Kalkschieferzone of the Meride Limestone Formation of Monte San Giorgio (UNESCO World Heritage area) is described. It represents the first known coelacanth from the Middle Triassic that undoubtedly bears elongate thin ribs. The incompleteness of the specimen prevents a reliable taxonomic assignment or the erection of a new species, however some characters, mainly scale morphology, are very similar to those of the holotype of Heptanema paradoxum Bellotti, 1857 from the roughly coeval Perledo Formation of Northern Italy. Elongate ribs are not reported in original descriptions of H. paradoxum, however small portion of ribs are visible among the scales of the holotype. Accordingly, the new specimen is tentatively ascribed to Heptanema as Heptanema cf H. paradoxum.

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Published

2021-11-10

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Articles