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Arachnid/ Myriapod

Arachnid/ Myriapod. Cristina Marti 9b. Reason for the name. Arachnid: Greek words  ἀράχνη  ( aráchnē ), meaning spider. Myriapoda : Greek  mrias , ten thousand. Podos : foot. . Number of species currently existing. Arachnid include over 100,000 species.

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Arachnid/ Myriapod

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  1. Arachnid/Myriapod Cristina Marti 9b

  2. Reasonforthename Arachnid: Greek words ἀράχνη (aráchnē), meaning spider. Myriapoda: Greek mrias, ten thousand. Podos: foot.

  3. Number of speciescurrentlyexisting Arachnid include over 100,000 species. Spiders, scorpions, harvestmen, ticks, and mites. Myriapoda contains 13,000 species Millipedes, centipedes.

  4. Characteristics

  5. 1st appearedonearth “Fossil record” Silurian Period

  6. Generalizedlifecycle and lifeexpectancy Produces an egg sac that can contains up to a thousand eggs. Baby spiders hatch from the eggs. Some are on their own and receive no care from their mother. Other spiders climb onto their mother's back after hatching, where she feeds them. In some species, the mother dies when the young are ready to go off on their own, and they eat her carcass. Life expectancy varies greatly.

  7. Eat and digestivesystem MostArachnid are carnivorous and feedonpre-digested bodies Give off venom from specialized glands Pour digestive juices over their prey after killing it Turn the prey into nutrients. Stomach has a tubular shape, with various diverticula throughout the body. These both produce digestive enzymes and absorb nutrients from the food.

  8. Respiratory and circulatorysystems Internal respiratory surfaces in the form of tracheae Internal vascular lamellae used for gas exchange with the air Blood varies depending on the respiration. May have a reduced circulatory system. Heart is located in the forward part of the abdomen. Some mites have no heart at all.

  9. Sensorysystems Fine sensory hairs that cover the body and give it its sense of touch. Many also have more complex structures, called trichobothria. Slit sense organs are pits covered with a thin membrane. Inside, a small hair touches the underside of the membrane, and detects its motion. Slit sense organs are believed to be involved in hearing.

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