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Journal Article

Phylogeny of the Subfamily Corydoradinae Hoedeman, 1952 (Siluriformes: Callichthyidae), with a Definition of Its Genera

Marcelo R. Britto
Proceedings of the Academy of Natural Sciences of Philadelphia
Vol. 153 (Dec., 2003), pp. 119-154
Stable URL: http://www.jstor.org/stable/4065103
Page Count: 36

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Topics: Bones, Catfish, Genera, Paratypes, Zoology, Taxa, Pectorals, Phylogenetics, Vertebrae, Phylogeny
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phylogeny of the Subfamily Corydoradinae Hoedeman, 1952 (Siluriformes: Callichthyidae), with a Definition of Its Genera
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Abstract

A phylogenetic hypothesis of relationships within the callichthyid subfamily Corydoradinae is proposed based on 83 characters. The monophyly of the subfamily is well supported, as are those of two included genera, Aspidoras and Brochis. However, the monophyly of Corydoras, as traditionally defined, is not corroborated, with some of currently included species being more closely related to Aspidoras or Brochis than to nominal congeners. These conclusions contrast with a previous hypothesis, which considered Brochis and Corydoras as forming a monophyletic assemblage, with Aspidoras as its sister-group. A clade composed of Aspidoras and the species currently assigned to Corydoras, C. barbatus, C. macropterus, C. prionotus and Corydoras sp. A, is herein recognized based on the following characters: possession of anterior portion of frontal bone long, hypobranchial 2 well ossified, free margin of opercle angulated, epiphyseal branch of the supraorbital canal long, and ossified portion of pectoral spine reduced. The remaining corydoradines are grouped in a monophyletic assemblage with complex vertebra compact, posterior expansion of ceratobranchial 3 notched, presence of triangular dorsal lamina on anguloarticular, and medial expansion of coracoid exposed. A new classification is proposed to accommodate the monophyletic groups defined in the present study. Discussions about subgroups within each major clade are provided. /// Uma hipótese sobre as relações filogenéticas da subfamília de Callichthyidae, Corydoradinae, é proposta com base em 83 caracteres. O monofiletismo da subfamília é corroborado, assim como o de dois gêneros nela incluídos, Aspidoras e Brochis. Entretanto, o monofiletismo de Corydoras, como tradicionalmente definido, não é corroborado, com algumas de suas espécies atuais sendo mais proximamente relacionadas a Aspidoras ou Brochis do que aos seus congêneres nominais. Estas conclusões contrastam com uma hipótese prévia que considera Brochis e Corydoras formando um agrupamento monofilético, com Aspidoras como seu grupo-irmão. Um clado composto por Aspidoras e as espécies assinaladas a Corydoras, C. barbatus, C. macropterus, C. prionotus e Corydoras sp. A, é diagnosticado pelos seguintes caracteres: porção anterior do osso frontal alongado, hipobranquial 2 bem ossificado, margem livre do opérculo angulada, ramo epifiseal do canal supra-orbital alongado, e porção ossificada do espinho peitoral reduzida. Os demais coridoradíneos são reunidos em um grupo monofilético definido pela vértebra complexa compacta, expansão posterior do ceratobranquial 3 com um entalhe, presença de lâmina dorsal triangular no ângulo-articular e expansão medial do coracóide exposta. Uma nova classificação é proposta para acomodar os grupos monofiléticos definidos no presente estudo. Discussões sobre subgrupos de cada um dos principais clados são fornecidas.

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