OTHER ARTHROPODS.

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Presentation transcript:

OTHER ARTHROPODS

MOLTING- Periodic shedding of exoskeleton to allow growth http://www.serc.si.edu/education/resources/bluecrab/molting.jsp MOLTING- Periodic shedding of exoskeleton to allow growth

Growth puts pressure on old shell http://www.serc.si.edu/education/resources/bluecrab/molting.jsp Growth puts pressure on old shell Stimulating molting hormones to digest old exoskeleton and make new one underneath Shell cracks open and animal backs out Animal pumps up with water and expands New shell hardens in few days While waiting for new exoskeleton to harden = particularly vulnerable to predators “soft shelled crabs”

ENDOCRINE SYSTEM makes hormones that control: MOLTING SEXUAL DEVELOPMENT METABOLISM

ARACHNIDS SPIDERS 8 legs No antennae Body constricted between cephalothorax and abdomen Excretory- Malpighian tubules Respiratory-Book lungs &/or trachea/spiracles Simple eyes with single lens Chelicera=fangs Spinnerets-release silk for webs

constricted between abdomen + cephalothorax http://www.csupomona.edu/~rskaae/CD1/spiders.html BODY- constricted between abdomen + cephalothorax

CHELICERA – modified fangs http://www.csupomona.edu/~rskaae/CD1/spiders.html CHELICERA – modified fangs

PEDIPALPS – aid in holding food and chewing http://normlyon.homeip.net/photos/gallery/Macro%20Photography/JumpingSpider/040707_203446_1.htm PEDIPALPS – aid in holding food and chewing

RESPIRATORY- Book lungs + spiracles http://science.kennesaw.edu/~jdirnber/InvertZoo/LecArthropod/SpiderX.jpg RESPIRATORY- Book lungs + spiracles

SPINNERETS- release silk for webs Images from: http://science.kennesaw.edu/~jdirnber/InvertZoo/LecArthropod/Arthropod.html http://www.elizapets.com/assets/images/Spider_Webs.JPG

collect and remove nitrogen waste via intestine Image from: http://www.emc.maricopa.edu/Faculty/Farabee/BIOBK/insectexcret_1.gif EXCRETORY: MALPIGHIAN TUBULES collect and remove nitrogen waste via intestine

UNIRAMIA INSECTS: 6 legs Antennae 3 part body- Head, thorax, abdomen Excretory- Malpighian tubules Respiratory-Trachea/spiracles

RESPIRATORY- trachea & spiracles http://www.frcc.cc.ca.us/home/instruct/disted/BIO100FRC_files/female%20grasshopper.jpg RESPIRATORY- trachea & spiracles

collect and remove nitrogen waste via intestine Image from: http://www.emc.maricopa.edu/Faculty/Farabee/BIOBK/insectexcret_1.gif EXCRETORY: MALPIGHIAN TUBULES collect and remove nitrogen waste via intestine

UNIRAMIA CENTIPEDES 1 pair of legs per segment MILLIPEDES flat bodies carnivorous with poison claws MILLIPEDES 2 pairs of legs per segment rounded bodies most herbivores Images from: http://science.kennesaw.edu/~jdirnber/InvertZoo/LecArthropod/Arthropod.html