moluscos e equinodermas
TRANSCRIPT
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MOLUSCOS E
EQUINODERMAS
AMSTERDAN R
EBOUÇAS – B
IÓLO
GO – CRBIO
36.3
05/5-D
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CARACTERÍSTICAS GERAIS:
ANIMAIS DE CORPO MOLETRIBLÁSTICOS CELOMADOSBILATÉRIOSGERALMENTE COM CONCHATERRESTRES OU AQUÁTICOSPROTOSTÔMIOS
Divisão: cabeça, pé e massa visceral
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CLASSIFICAÇÃO
Gastrópodos – caramujo, caracol e lesma.
Cefalópodos – lula, polvo Bivalves ou Pelecípodos – ostra, mexilhão
Amphineura – quíton.
Scaphopoda – Dentalium sp.
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CLASSIFICAÇÃOGastrópodos
Cefalópodos
Bivalves
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Amphineura
Scaphopoda
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SISTEMASDigestório - Completo (boca e ânus)
Circulatório – Aberto ou lacunar
Excretor – Nefrídeos
Nervoso - Ganglionar
Respiratório – Cutânea ou branquial
Esqueleto – Ausente (lesma). Exoesqueleto (caracol) ou endoesqueleto (polvo)
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Rádula em gastrópodos e cefalópodos
(Ralar os alimentos)
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ReprodutorSexos
Dióico (maioria)Gastrópodes - monóicos
FecundaçãoInterna – gastrópodos e cefalópodos Externa – Bivalves
Desenvolvimento Direto – gastrópodes e cefalópodesIndireto – Bivalves
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EQUINODERMOS
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CARACTERIZAÇÃO GERAL
Exclusivamente marinhosEndoesqueleto calcáreo ao qual se associam
espinhosTriblásticosCelomados (origem enterocélica)DeuterostômiosSimetria bilateral primária e pentarradialNão metamerizados
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CLASSIFICAÇÃO GERAL
Classe Asteroidea: estrela-do-mar.Classe Echinoidea: ouriço-do-mar,
bolacha-da-praia.Classe Holothuroidea: pepino-do-
mar.Classe Crinoidea: lírio-do-mar.Classe Ophiuroidea: serpente-do-
mar.
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estrela-do-mar serpente-do-mar
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ouriço-do-marbolacha-da-praia
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pepino-do-mar lírio-do-mar
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TEGUMENTO
Epitélio simplesEspinhos que podem ser
móveis articulados por músculos
Pedicelária: componentes semelhantes a uma pequena pinça, envolvidos com a limpeza do tegumento
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PEDICELARIOSPEDICELARIOS
EspinhoEspinhoEspinhoEspinho
PedicelariosPedicelariosPedicelariosPedicelarios
BranquiaBranquiaBranquiaBranquia
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SISTEMA AMBULACRÁRIO
Componente ambulatório exclusivo de equinodermos:
Placa madrepóricaCanal pétreoCanal circularCanais radiaisAmpolaPé ambulacrário
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MadreporitoMadreporitoMadreporitoMadreporito
Canal anularCanal anularCanal anularCanal anular
Canal pétreoCanal pétreoCanal pétreoCanal pétreo
Canal radialCanal radialCanal radialCanal radial
Canal lateralCanal lateralCanal lateralCanal lateral
pépépépé
Vesículas de PoliVesículas de PoliVesículas de PoliVesículas de Poli
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RESPIRAÇÃO
A função respiratória é realizada pelo sistema ambulacrário
Brânquias ramificadas em asteróides e equinóides
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SISTEMA DIGESTÓRIO
Completo (ausência de ânus em ofiúros)
Aparelho bucal com 5 dentes acionados por fortes músculos: Lanterna de Aristóteles
Nas estrelas-do-mar há 5 pares de cecos gástricos emitidos para os braços
Ausência de ânus em ofiúros
Em crinóides o tubo digestório é curvado em U;
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SISTEMA CIRCULATÓRIO
Ausência de sistema organizado
Sistema de lacunas celomáticas (pseudo-hemal) contendo líquido com amebócitos
Coração ausente
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EXCREÇÃODifusão direta por qualquer superfície exposta à água.
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SISTEMA NERVOSO
Primitivo, sem órgão central (não cefalizados)
Anel peribucal nervoso com 5 cordões nervosos radiais para os braços
Células tácteis e quimiorreceptoras na superfície
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REPRODUÇÃODióicos;Sem dimorfismo sexual;Fecundação externa;Desenvolvimento indireto;Pode haver regeneração em
estrela-do-mar.
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Larva braquiolária Larva plúteo
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