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Ch 28-4 – Insects and Their Relatives
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Uniramians – Centipedes, millipedes and insects Characterized by one pair of antennae and appendages that don’t branch
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Centipede and Millipede Wormlike body Many leg-bearing segments centipede millipede
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Centipedes Carnivores Poison claws in head Eat arthropods, earthworms, snakes, mice Have ONE pair of legs per segment (not necessarily 100 legs!) Have venomous bites against predators
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Cenitpede eating tarantula
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Centipede poison claw
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Centiped protecting hatchling
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Millipede Two pair of legs per segment Herbivores Feed on dead and dying plant material Protect themselves by rolling into a ball or use “nasty chemicals” to dissuade their predators
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Millipedes
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Millipede Many legs!!
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Millipede
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Millipede eating
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Protection
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Insects Have 3-part body 3 pairs of legs attached to thorax
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Feeding 3 pairs of appendages used as mouthparts One is the mandible Amazing modifications of the mouthparts
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mouthparts
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Other modifications for feeding – mosquitos saliva – anticoagulant
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Bees legs and bodies are covered in hair for collecting pollen
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Bees have glands in abdomen that secrete wax to build bee hives for food storage and larvae nurseries Bee saliva changes nectar into honey
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movement Three pairs of walking legs are greatly varied Many insects have highly specialized legs for jumping and capturing prey
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flight Flying ability varies greatly Butterflies have limited manoeuvrability
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Certain flies, bees and moths can fly extremely well
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Thorax is filled with large muscles for wings
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Adaptations for flight Enlarged thorax for muscles Oversized mitochondria supply muscle cells with energy Special blood supply to wing muscles keep muscles warm (sometimes warmer than outside) for optimal efficiency
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Clear wing butterfly
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Insect colonies Collections of individuals of the same species that live together SOCIETIES are colonies where individuals are DEPENDENT on the others for survival
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ANTS! Ant Colony
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Termites, wasps, bees and ants form societies Have division of labour Different individuals (called castes) will have specialized bodies to perform their task in the society
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Examples of castes: reproductive females (queens) reproductive males Workers warriors Termite Queen workers
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Termite soldier Worker
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QUEEN
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Reproductive males ONLY fertilize the eggs In BEE SOCIETIES, the queen mates with one or more males only ONCE. She receives all the sperm she needs in that mating The successful reproductive male then dies All unsuccessful reproductive males are turned out of the hive, and soon die
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Workers do all the work for the hive Bee workers are all female and are able to do all jobs (except reproduce) Ant and termite workers are specialized for specific jobs
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Insect Communication Non-social insects communicate mainly to find mate only Cricket males rub their forelegs together Male cicadas buzz by vibrating a membrane on their abdomen
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Male fireflies produce a series of light flashes The wingless females (glow worms) flash back their reply, and the males will find them (sometimes another genus will mimic this signal and prey on the expectant male)
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Many female moths produce pheromones to attract their male
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Social insects have more complicated communication systems Pheromones are often used Ex. Ants drag their abdomen all the way home from a food source to leave a trail for other ants to find the food
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The Queen Bee produces “queen substance” that prevents other females being able to lay eggs When queen substance is low in the hive, the worker bees will feed a few female larvae a special diet which causes these larvae to develop into queens
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Worker bees “dance” to tell other workers where they found food Two basic dances: the round dance and the waggle dance
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The Round Dance The bee walks in a circle, then retraces that circle in the opposite direction Means that food is within 50 meters of the hive Good quality food will be indicated by more frequent changes of direction The kind of flower found is determined by smelling the messenger
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The Waggle Dance The bee wiggles her abdomen while walking in a straight line She circles around and wiggles back up the same line She will then circle around on the other side of the line, and repeats
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The waggle dance means that the food source found is more than 50 meters away from the hive The direction of the straight line is the direction the other bees must travel away from the hive to find the food
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1 million species of insects have been identified so far, which is about ½ of all animals known to science Sizes could vary from.25mm to 50 cm Many male insects have appendages called claspers, which help them stay in position during mating.
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Centipedes
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