OTHERARTHROPODS

MOLTING- Periodic shedding of exoskeleton to allow growth

http://www.serc.si.edu/education/resources/bluecrab/molting.jsp

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

ARACHNIDSSPIDERS 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

http://www.csupomona.edu/~rskaae/CD1/spiders.html

BODY- constricted between abdomen + cephalothorax

CHELICERA – modified fangs

http://www.csupomona.edu/~rskaae/CD1/spiders.html

PEDIPALPS – aid in holding food and chewing

http://normlyon.homeip.net/photos/gallery/Macro%20Photography/JumpingSpider/040707_203446_1.htm

RESPIRATORY- Book lungs + spiracles

http://science.kennesaw.edu/~jdirnber/InvertZoo/LecArthropod/SpiderX.jpg

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

EXCRETORY:MALPIGHIAN TUBULES collect and remove nitrogen waste via

intestine

Image from: http://www.emc.maricopa.edu/Faculty/Farabee/BIOBK/insectexcret_1.gif

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

EXCRETORY:MALPIGHIAN TUBULES collect and remove nitrogen waste via

intestine

Image from: http://www.emc.maricopa.edu/Faculty/Farabee/BIOBK/insectexcret_1.gif

CENTIPEDES 1 pair of legs per segment

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

UNIRAMIA