Redescription of 'Perleidus' (Osteichthyes, Actinopterygii) from the early triassic of northwestern Madagascar

Autor(en)

Giuseppe Marramà, Cristina Lombardo, Andrea Tintori, Giorgio Carnevale

Abstrakt

The revision of the material from the Lower Triassic fossil-bearing-nodule levels from northwestern Madagascar supports the assumption that the genus Perleidus De Alessandri, 1910 is not present in the Early Triassic. In the past, the presence of this genus has been reported in the Early Triassic of Angola, Canada, China, Greenland, Madagascar and Spitsbergen. More recently, it has been pointed out that these taxa may not be ascribed to Perleidus owing to several anatomical differences. The morphometric, meristic and morphological analyses revealed a remarkable ontogenetic and individual intraspecific variation among dozens of specimens from the lower Triassic of Ankitokazo basin, northwestern Madagascar and allowed to consider the two Malagasyan species P. madagascariensis Piveteau, 1934, and P. piveteaui Lehman, 1952, as a single one and to ascribe it to the new genus Teffichthys. This new genus exhibits a unique combination of features, mainly in the skull dermal bone pattern and structure of caudal fin, that clearly support its exclusion from Perleidiformes. We also suggest to extend the use of Teffichthys for the other Early Triassic 'Perleidus' species except those from southern China.

Organisation(en)

Institut für Paläontologie

Externe Organisation(en)

Università degli Studi di Milano-Bicocca, Università degli Studi di Torino

Journal

Rivista Italiana di Paleontologia e Stratigrafia

Band

123

Seiten

219-242

Anzahl der Seiten

24

ISSN

0035-6883

Publikationsdatum

07-2017

Peer-reviewed

Ja

ÖFOS 2012

105118 Paläontologie

Schlagwörter

ASJC Scopus Sachgebiete

Geology, Stratigraphy, Palaeontology

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2788af79-b108-4159-bd7d-af79a6ba2999