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Gills of the seawater fi sh Cat/w raps spixii (Agassiz, 1829) were submitted to ro uti ne processing for observation in scanning and transmission electron microscopy. The wrinkled surface of the gill filaments showed well-defined cellular ultrastructures. Microridges on cellular surface were projected over all gill structures, including respiratory lamellae. Chloride cells were usually at primary lamellae. Some rod let cells were fo und. Mucous secretory cells were uncommon at all parts of thedoi:10.1590/s0101-81752002000400026 fatcat:kktfjv554rbrxak3u2tqinh5jq