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A new species of Placidichthys (Halecomorphi: Ionoscopiformes) from the Lower Cretaceous Marizal Formation, northeastern Brazil, with a review of the biogeographical distribution of the Ophiopsidae

By
Paulo M. Brito
Paulo M. Brito
Departamento de Biologia Animal e Vegetal
,
Universidade do Estado do Rio de Janeiro
,
Rua São Francisco Xavier 524, Rio de Janeiro, RJ 20559-900
,
Brazil
(e-mail: pbritopaleo@yahoo.com.br)
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Jesús Alvarado-Ortega
Jesús Alvarado-Ortega
Departamento de Biologia Animal e Vegetal
,
Universidade do Estado do Rio de Janeiro
,
Rua São Francisco Xavier 524, Rio de Janeiro, RJ 20559-900
,
Brazil
(e-mail: pbritopaleo@yahoo.com.br)
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Published:
January 01, 2008

Abstract

A new halecomorph fish is described from the Early Cretaceous Marizal Formation of Tucano Basin. This new material is identified as a new species of Placidichthys, P. tucanensis sp. nov. based on the absence of an anal fin, the lower number of flank scales in the caudal region, the slender shape of the body, and body proportions. Placidichthys tucanensis sp. nov. increases the distribution and diversity of ophiopsids in the western part of the Tethys Sea, being distributed along the epicontinental seas of Gondwana.

Placidichthys is considered the sister-taxon of the exclusively Cretaceous taxa Teoichthys+Macrepistius from the western Tethys. These groups show a discernible geographical distribution pattern with Placidichthys known only from the Southern margin of the Tethys region (South America), whilst Teoichthys and Macrepistius are known only from North America and possibly Europe.

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Contents

Geological Society, London, Special Publications

Fishes and the Break-up of Pangaea

L. Cavin
L. Cavin
Museum d’Histoire de Naturelle, Genève, Switzerland
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A. Longbottom
A. Longbottom
Natural History Museum, UK
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M. Richter
M. Richter
Natural History Museum, UK
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Geological Society of London
Volume
295
ISBN electronic:
9781862395435
Publication date:
January 01, 2008

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