Download - Filo Nematoda
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Vermes de corpo cilíndrico e afilado
Tubo digestório completo
Maioria vida livre, mas podem ser parasitas
Terrestres ou aquáticos
Tamanho de 1mm a 8m (Placentonema gigantisima – verme da baleia)
Corpo em forma tubular, sendo um túbulo dentro do outro
O tubo externo é a parede do corpo, o interno, é o intestino, que vai da boca ao ânus
Entre os dois tubos está o pseudoceloma onde se localizam os órgãos reprodutores e um líquido que preenche a cavidade – o líquido celomático.
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O líquido celomático tem a função de:
. Favorecer a distribuição de nutrientes pelo intestino
. Atuar na excreção
. Funcionar como esqueleto hidrostático
Músculos longitudinais que favorecem a flexão
Presença de cutícula espessa, sem cílios
Necessita de muda para o crescimento
Boca com 3 lábios carnosos ligados a uma faringe musculosa que faz a sucção dos alimentos
As excretas são liberadas por canais longitudinais que formam um poro excretor único
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Há dois ramos nervosos longitudinais e um anel nervoso ao redor da faringe
Apresentam sexos separados, são dióicos. A fecundação é interna e o desenvolvimento é indireto, na maioria.
cordão nervoso dorsal
cutícula
epiderme
intestino
canal excretor
fibra muscular
cordão nervoso ventral
ramos de união
das células
musculares ao
cordão nervoso
útero
ovário
oviduto
pseudoceloma
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ânus
útero
intestino
ovário poro genital
vagina
faringe
boca
lábios bucais
poro excretor
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Enterobius vermicularis
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Culex sp
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