Swiss Journal of Geosciences

, Volume 106, Issue 2, pp 219–230

A new basal actinopterygian fish from the Late Ladinian of Monte San Giorgio (Canton Ticino, Switzerland)

Article

DOI: 10.1007/s00015-013-0125-9

Cite this article as:
Lombardo, C. Swiss J Geosci (2013) 106: 219. doi:10.1007/s00015-013-0125-9

Abstract

A new taxon of Late Ladinian basal actinopterygian is described on the basis of a single specimen from the Meride Limestone (Kalkschieferzone) of Meride (Canton Ticino, Switzerland). The species is characterized by a single plate-like branchiostegal, a suboperculum larger than the operculum, a maxillary fixed and posteriorly expanded, a large and rectangular dermopterotic and a large triangular dermosphenotic; the scales are rectangular to rhomboidal, the lepidotrichia of median fins are segmented from their base and the caudal fin shows epaxial rays. These features resemble the condition of the Redfieldiiformes, a freshwater fish group, whose presence in Europe is still controversial, owing to poor preservation of specimens found so far.

Keywords

Actinopterygians Middle Triassic Monte San Giorgio Lagerstätte Taxonomy Palaeobiogeography 

Abbreviations

MCSNL

Museo Cantonale di Storia Naturale di Lugano (Switzerland)

ant

Antorbital

b.f.

Basal fulcra

br

Branchiostegal ray

cl

Cleithrum

dpt

Dermopterotic

dsph

Dermosphenotic

d.s.

Dorsal scute

exsc

Exstrascapular

f.f

Fringing fulcra

fr

Frontal

gu

Gular

ifo

Infraorbital bone

lmd

Left mandibula

mx

Maxilla

na

Nasal

op

Operculum

pa

Parietal

pcl

Postcleithrum

pl

Pit line

pop

Preoperculum

pr

Post-rostral

pt

Posttemporal

rmd

Right mandibula

ro

Rostral bone

scl

Supracleithrum

sop

Suboperculum

Copyright information

© Swiss Geological Society 2013

Authors and Affiliations

  1. 1.Dipartimento di Scienze della Terra “A. Desio”Università degli Studi di MilanoMilanItaly

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