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Article: Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications

Papers in Palaeontology - Volume 3 Part 4 - Cover
Publication: Palaeontology
Volume: 3
Part: 4
Publication Date: November 2017
Page(s): 559 581
Author(s): Soledad Gouiric‐Cavalli, Ana M. Zavattieri, Pedro R. Gutierrez, Bárbara Cariglino, and Lucía Balarino
DOI: 10.1002/spp2.1089
Addition Information

How to Cite

GOUIRIC‐CAVALLI, S., ZAVATTIERI, A.M., GUTIERREZ, P.R., CARIGLINO, B., BALARINO, L. 2017. Increasing the fish diversity of the Triassic faunas of Gondwana: a new redfieldiiform (Actinopterygii) from the Middle Triassic of Argentina and its palaeobiogeographical implications. Papers in Palaeontology, 3, 4, 559-581. DOI: 10.1002/spp2.1089

Author Information

  • Soledad Gouiric‐Cavalli - División Paleontología Vertebrados Museo de La Plata Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Universidad Nacional de La Plata La Plata Argentina (Email: sgouiric@fcnym.unlp.edu.ar)
  • Ana M. Zavattieri - Departamento de Paleontología Instituto Argentino de Nivología Glaciología y Ciencias Ambientales Centro Científico Tecnológico Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Mendoza Argentina (Email: amz@mendoza-conicet.gob.ar)
  • Pedro R. Gutierrez - Área de Paleobotánica y Paleopalinología Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Ciudad Autónoma de Buenos Aires Argentina (Email: prgutierrez@macn.gov.ar)
  • Bárbara Cariglino - Área de Paleobotánica y Paleopalinología Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Ciudad Autónoma de Buenos Aires Argentina (Email: barichi10@gmail.com)
  • Lucía Balarino - Área de Paleobotánica y Paleopalinología Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” Consejo Nacional de Investigaciones Científicas y Técnicas CONICET Ciudad Autónoma de Buenos Aires Argentina (Email: lubalarino@macn.gov.ar)

Publication History

  • Issue published online: 09 November 2017
  • Manuscript Accepted: 18 July 2017
  • Manuscript Received: 11 April 2017

Funded By

Agencia Nacional de Promoción Científica y Tecnológica. Grant Numbers: 2012/1637, 2015/0253
Consejo Nacional de Investigaciones Científicas y Tecnológicas.

Online Version Hosted By

Wiley Online Library
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Abstract

A new actinopterygian, Calaichthys tehul gen. et sp. nov. is described on the basis of a few, well‐preserved specimens from the Anisian Cerro de Las Cabras Formation, Cuyo Basin in Mendoza Province. The new genus shows a combination of primitive characters (e.g. deep posterior region of the maxilla contacting the preopercle, a suspensorium backwardly oriented) and more advanced characters (e.g. distally segmented fin rays, hemiheterocercal caudal fin) and is thus considered to be a ‘subholostean’ fish. The new taxon is assigned to Redfieldiiformes on the basis of its single branchiostegal plate‐like ray, a median gular plate, pectoral fins with stout, stiff, mainly non‐segmented and distally branched fin rays, long and robust fringing fulcra in all fins, basal fulcra bordering both lobes of the caudal fin, and opposite dorsal and anal fins. Calaichthys is characterized by a combination of characters some of which are unique among redfieldiiforms (i.e. strongly ornamented but thin scales with a serrated posterior margin, smooth skull roof bones, extrascapulars with a bifid posterior margin, three suborbital bones, a hatchet‐shaped preopercle, rectangular and slender opercle, deep mouth gape, entopterygoid and ectopterygoid with small pointed teeth disposed in several series, unornamented rostral bone, massive pectoral fins and delicate dorsal, pelvic and anal fins). Calaichthys provides novel information about the anatomy of redfieldiiforms, in particular in relation with the fins and associated scaly elements, as well as the scale morphology and their disposition over the body. Our work confirms for the first time that redfieldiiforms occur in South America. Redfieldiiforms seem to have originated in Gondwana and shown two diversity peaks: in the Anisian and the Carnian. Calaichthys is coeval with those redfieldiiforms of the Middle Triassic (Anisian) of Africa and Australia dwelling in ephemeral lakes.

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