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PEIXES
by Prof. LENO / 2011
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Agnatha• Não possuem mandíbulas, esqueleto
cartilaginoso.
• Eram animais abundantes nas eras geológicas passadas, mas na fauna atual estão representados pelas LAMPRÉIAS.
• Dos Agnathas surgiram dois grupos de vertebrados tipicamente aquáticos:
CondríctiesOsteícties
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Características
• Animais ectoparasitas de peixes e de baleias, ocorrem tanto no mar como também em água doce.
• Sua boca é reduzida e composta por pequenos dentes que são usados para arrancar partes do corpo da presa.
by Prof. LENO / 2011
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by Prof. LENO / 2011
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Condrícties
• São os peixes cartilaginosos;
• Possuem de 5 a 7 fendas branquiais, não recobertas pelo opérculo.
• Possuem uma estrutura chamada Ampolas de Lorenzini.
• Não possuem a bexiga natatória.
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Ampolas de Lorenzini
• Poros e tubos cheios de muco localizados na cabeça, que se comunicam com a água e com células sensoriais.
• Olhos com excelente visão em baixa luminosidade.
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Bexiga Natatória
• Não está presente nestes animais, sua flutuação está voltado para o Fígado.
• Fecundação interna e desenvolvimento direto.
• O Macho possuí o Clásper.
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Osteícties
• Peixes ósseos;
• Possuem a Bexiga natatória;
• Opérculo protegendo as brânquias;
• O corpo geralmente coberto por escamas.
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Respiração
• A Maioria dos peixes fazem as sua trocas gasosas pelas brânquias, com exceção dos DIPNÓCOS.
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Dipnóicos
• São peixes Pulmonados;
• O representante brasileiro é a Pirambóia
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Candiru
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