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Revista Brasileira de Zoologia

Print version ISSN 0101-8175

Rev. Bras. Zool. vol.16 no.2 Curitiba June 1999 

Morfologia e ultraestrutura de arcos branquiais de juvenis de Mugil platanus Günther (Pisces, Mugilidae)


Gill arch surface morphology and ultrastructure of juvenile Mugil platanus Günther (Pisces, Mugilidae)



José Claro da Fonseca NetoI,II; Henry Louis SpachI

ICentro de Estudos do Mar, Universidade Federal do Paraná. Avenida Beira Mar, 83255-000 Pontal do Paraná, Paraná, Brasil
IICurso de Pós-graduação em Zoologia, Departamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil




Scanning electron microscopy revealed that the gill arch surface from juveniles of Mugil platanus Günther, 1880 is similar to that reported for others euryhaline teleosts. Two filament rows (about 41-49 filament per row) extend posteriorly, and two rows of rakers (about 42-46 rakers per row) extended anteriorly from each arch. Respiratory lamellae protrude along both sides of each filament (37/mm), from the base to the apex. The distribution, sizes and structure of various surface cells were also described. Except for the respiratory lamellae, the surface of whole gill arch is covered by a mosaic of pavement cells, which measure about 6,94X4,61µm and exhibit concentrically arranged surface ridges. The anterior pharyngeal surfaces of the raker of the first arch and the ventral part of the second, smooth secondary projections are present which are replaced by spiny secondary projections on the dorsal part of the second arch, and entire third and fourth arches. Taste buds are especially prominent between smooth projections. Apical ciypts of chloride cells oceur mostly at the afferent surface of the gill filament.

Key words: Gill arch, Mugil platanus, morfology, surface ultrastructure



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AGRADECIMENTOS. Agradecemos a CAPES, ao Centro de Estudos do Mar, Universidade Federal do Paraná (UFPR), ao Curso de Pós-Graduação em Zoologia, UFPR, ao Centro de Microscopia Eletrônica, UFPR, ao do Laboratório de Microscopia Eletrônica do Instituto de Física, Universidade de São Paulo.



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Recebido em 11.XII.1997; aceito em 12.IV.1999.

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