oligoquetos, olicochaeta
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Clasificación, imágenes y conceptos.TRANSCRIPT
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Clase Oligochaeta
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Oligoquetos
• Con más de 3,000 especies.
• Mayoría terrestres y dulceacuícolas pero los hay marinos y parásitos.
• Carecen de parápodos y con quetas escasas.
• Lumbricus terrestris
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Oligoquetos
• Prostomio, tronco y pigidio.
• Metámeros homónomos, de 7 a 600 con 4 pares de quetas cada uno.
• Clitelo, segmentos del 9 al 15.
• Cutícula delgada y epidermis con abundantes células productoras de moco.
• Capa de músculo circular y capa de músculo longitudinal
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Oligoquetos
• Aparato digestivo: boca, faringe, esófago, buche, molleja, intestino (tiflosol), recto y ano. Tejido cloragógeno cubre al intestino y rodea vaso sanguíneo dorsal.
• Par de metanefridios por somita, desechan amornio (acuáticos) y urea (terrestres).
• Aparato circulatorio cerrado, con vaso dorsal, vaso ventral y transversales.
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Oligoquetos
• Intercambio gaseoso cutáneo, algunas formas acuáticas con branquias.
• Sistema nervioso con ganglio cerebroide, collar periesofágico y cordones longitudinales ventrales. Con conectivos transversales y pares de ganglios fusionados en cada somita.
• Órganos de los sentidos simples: fotorreceptores, quimiorreceptores unicelulares, terminaciones nerviosas libres función táctil.
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Oligoquetos• Hermafroditas protándricos, con espermatecas.
Requieren de apareamiento.
• Fecundación externa.
• Clitelo segrega moco para permitir el apareamiento y además forma el capullo donde se lleva a cabo la fecudación.
• Desarrollo directo.
• Eclosión de 1 a 4 meses, madurez sexual de 6 a 10 meses.
• Reproducción asexual por ecisparidad.
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Tubifex tubifex
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