Diferenciação morfométrica e osteológica entre Ramnogaster arcuata (Jenyns) e Platanichthys platana (Regan) (Teleostei, Clupeidae)

Morphometric variation and osteological analysis in Ramnogaster arcuata (Jenyns) and Platanichthys platana (Regan) (Teleostei, Clupeidae)

Clupeidae; multivariate morphometry; morphological variation; osteology

Diferenciação morfométrica e osteológica entre Ramnogaster arcuata (Jenyns) e Platanichthys platana (Regan) (Teleostei, Clupeidae)

Morphometric variation and osteological analysis in Ramnogaster arcuata (Jenyns) and Platanichthys platana (Regan) (Teleostei, Clupeidae)

Fernando Dantas Campello^I; Marlise de Azevedo Bemvenuti^II

^ICurso de Oceanologia, Fundação Universidade Federal do Rio Grande. Caixa Postal 474, 96201-900 Rio Grande, Rio Grande do Sul, Brasil. E-mail: [e-mail]

^IIDepartamento de Oceanografia, Fundação Universidade Federal do Rio Grande, Caixa Postal 474, 96201-900 Rio Grande, Rio Grande do Sul, Brasil. E-mail: [e-mail]

ABSTRACT

Ramnogaster arcuata (Jenyns, 1842) and Platanichthys platana (Regan, 1917), found at the estuary of Lagoa dos Patos and coastal lagoon (Lagoa Mirim) at the South of Brazil, are two sympatric clupeid fishes with very similar features. In order to clarify their taxonomic and geographical situation, delimiting its occurrence in fresh waters, a comparative study of the bony structures of the head, anal and dorsal fins and ventral scutes of these two sardines was developed. The osteological study with clear and stain technique included more information about the differentiation of the groups from the bones of the supramaxilla, dentary, pterygiophore and epipleural ribs. Variations on the body shape of those species were analyzed through the multivariate morphometry, in order to obtain differentiation patterns between the groups. Thirty specimens were selected from each species. The measurements were obtained by truss network, by using 10 homologous anatomical landmarks. The analysis of the principal components, adjusted by Burnaby's orthogonal projection, indicated two main groups, separated along the PC 1. which explained 63.2% of the variation between groups. The diagnostic characters that differentiate R. arcuata from P. platana, were related to segments of distance of the head, longitudinal growth, body height and caudal peduncle. Furthermore, two groups of P. platana were found. In spite of their morphological similarities, they presented a differentiation gradient between the estuary population of the Patos Lagoon and the Mirim Lagoon, possibly resulting from two ecologically different environments.

Key words: Clupeidae, multivariate morphometry, morphological variation, osteology

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AGRADECIMENTOS. Ao pessoal do Laboratório de Ictiologia, Departamento de Oceanografia, FURG, pelo auxílio na coleta dos exemplares; ao Luciano G. Fischer pelo auxílio nas ilustrações; ao CNPq pela Bolsa de Iniciação Científica para Fernando Dantas Campello.

Recebido em 10.VIII.2001; aceito em 31.VII.2002.

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Datas de Publicação

• Publicação nesta coleção
  15 Maio 2009
• Data do Fascículo
  Set 2002

Histórico

• Recebido
  10 Ago 2001
• Aceito
  31 Jul 2002