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Unidad 4 Los animales invertebrados

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Unidad 4 Los animales invertebrados Ciencias de la Naturaleza 4º Educación Primaria. Presentación elaborada por Elena Rodríguez esteban, maestra del CEIP Nuestra Señora del Villar de Laguna de Duero (Valladolid)

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Unidad 4 Los animales invertebrados

  1. 1. TEMA 4 – LOS ANIMALES INVERTEBRADOS
  2. 2. LOS ANIMALES FUNCIONES VITALES REPRODUCCIÓN • Los animales se reproducen y nacen nuevos animales semejantes a ellos. • La mayoría tienen reproducción sexual (deben intervenir seres de diferente sexo). • Por su forma de reproducirse pueden ser: • Ovíparos (Las crías nacen de un huevo) • Vivíparos (Las crías nacen NUTRICIÓN • Los animales toman alimentos que proceden de otros seres vivos. • Según su forma de alimentación pueden ser: • Herbívoros (Plantas) • Carnívoros (Animales) • Omnívoros (Animales y plantas) • Detritívoros (restos de seres vivos) RELACIÓN • Los animales reciben información de su entorno a través de los sentidos. • Algunos sentidos de los animales son diferentes de los de los humanos.
  3. 3. ANIMALES INVERTEBRADOS 3.- GUSANOS • Tienen cuerpo blando y alargado. • No tienen patas. • Algunos viven en la tierra y otros en el agua. • Algunos como las lombrices intestinales o las tenias pueden vivir en nuestro cuerpo y causar enfermedades. 1.- ESPONJAS • Son los invertebrados más sencillos. • Son acuáticos y viven fijos sobre las rocas. • Su cuerpo tiene forma de saco. • Su cuerpo está lleno de poros por los que entra el agua y atrapa los alimentos. 2.- MEDUSAS • Son acuáticas. • Se desplazan por el agua y son arrastradas por las corrientes. • Tienen cuerpo gelatinoso (Forma de paraguas). • Poseen tentáculos con aguijones que inyectan veneno cuando algo las
  4. 4. ANIMALES INVERTEBRADOS 4.- MOLUSCOS • Invertebrados de cuerpo blando. • Tienen una o dos conchas. • La mayoría viven en el agua (mejillones, almejas, pulpos…) y otros en la tierra (caracoles). • Son ovíparos, es decir, del huevo sale una cría diferente al adulto llamada larva. 5.- EQUINODERMOS • Esqueleto formado por placas duras bajo su piel. • Suelen tener espinas. • Todos son marinos (estrellas de mal y erizos de mar).
  5. 5. ANIMALES INVERTEBRADOS 6.- ARTRÓPODOS • Tienen un esqueleto externo formado por varias piezas unidas por articulaciones. • Tienen patas articuladas. INSECTOS • Son ovíparos. • Casi todos son terrestres. • Tienen 2 antenas y 6 patas. • Su cuerpo está dividido en: cabeza, tórax y abdomen. • Son las avispas, ARÁCNIDOS • Son artrópodos de 8 patas. • No tienen antenas. • Casi todos son terrestres. • Son las arañas y escorpiones. CRUSTÁCEOS • Tienen una cubierta dura. • Tienen antenas. • Muchos de ellos tienen 10 patas. • La mayoría son marinos. • Son los cangrejos, gambas, camarones… MIRIÁPODOS • Tienen cuerpo largo o dividido en segmentos. • Tienen numerosas patas. • Tienen antenas. • Son los ciempiés, milpiés…
  6. 6. ANIMALES INVERTEBRADOS No tienen huesos ni columna vertebral 3.- GUSANOS1.- ESPONJAS 2.- MEDUSAS
  7. 7. ANIMALES INVERTEBRADOS No tienen huesos ni columna vertebral 4.- MOLUSCOS • Bivalvos • Caracoles • Pulpos, calamares, sepias.
  8. 8. ANIMALES INVERTEBRADOS No tienen huesos ni columna vertebral 6.- ARTRÓPODOS • Insectos • Arácnidos • Crustáceos • Miriápodos 5.- EQUINODERMOS • Estrellas de mar • Erizos de mar

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