Arthropods Molly, Isaiah, Holly, Sean
Dec 14, 2015
Arthropods Molly, Isaiah, Holly, Sean
Body SymmetryBilateral
http://biologytricks.blogspot.com/2012/05/animal-kingdom.html
LocomotionSegmented legsSome have wingsAre adapted to live in almost any
habitat◦Aquatic, terrestrial, air
Smooth muscles
Nervous SystemDorsal brain and ventral nervous
cordChains of ganglia serve various
parts of bodyThe brain is made of 3 parts
Digestive SystemOne wayHave digestive glands
◦Special because not present in many organisms
Excretory SystemPresent Malphigian tubules
◦Projections of the digestive tract◦Help conserve water
Circulatory SystemDorsal vesselOpen systemAlary muscles on each side of
chamberPeristaltic contractions move
hemolymphhttp://www.cals.ncsu.edu/course/ent425/tutorial/circulatory.html
Respiratory SystemSpiracles in exoskeletonFlap like valvesTracheal trunk and tubesTracheole acts as a filter
http://www.cals.ncsu.edu/course/ent425/tutorial/respire.html
http://www.cals.ncsu.edu/course/ent425/tutorial/respire.html
Skeletal SystemExoskeleton
◦Provides a lot of space for movement (joints, anchor for muscles and appendages)
◦Provides protection◦Composed of chitin
Other species exoskeletons are composed of lipids, proteins, and calcium carbonate
Skeletal System (Con’t)Allows for very little growth
◦Forces organism to molt (shed)After exoskeleton molts the
organism is exposed and vulnerable until new shell hardens
After molt the organism often hides for protection ◦metabolism slows down during hiding
Reproductive systemSeparate sexes (male and
female)Gonads connected directly to
ducts located on the ventral surface of the trunk
Sperm is transferred to female within seal packets called spermatophores
Reproductive Sys.(Con’t)Spermatophores
◦Little containers of sperm◦Not diluted in aquatic areas◦Sometimes deposited directly in the
female◦Some insect or arachnids deposit on
ground and leave a chemical signal to attract the female
Class: CrustaceansCrabs, lobsters, shrimp, wood liceGenerally aquatic5 pairs of legsCrush prey with claws
Class: CentipedesOne pair of legs per segmentNickname: “hundred-leggers”PoisonousHunters
◦Vomit on their prey to liquefy them
Class: Millipedes2 pairs of legs per segmentNickname: “thousand-leggers”Scavenge for decaying plant
material, leaves, etc◦Detrivores
Non-poisonous
Class: ArachnidsSpiders, scorpions, mites2 body segments8 legsCarnivorous
◦Feed on predigested bodies of insects and other small animals
◦Drink the blood and insides
Class: InsectsExamples: Flies, bees, antsThree body segments
◦Head◦Thorax ◦Abdomen
Six legs
Phun Phylum PhactsCompound eyesTough exoskeleton made of chitinCalled “joint-legged” because
they have segmented legs84% of animals are arthropods
Works Cited Barnes, Robert D. "Arthropod (animal Phylum)." Encyclopedia
Britannica Online. Encyclopedia Britannica, n.d. Web. 03 Oct. 2014.
Barnes, Robert D. "Reproductive System and Life Cycle." Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 01 Oct. 2014.
"CIRCULATORY SYSTEM." Circulatory System. N.p., n.d. Web. 03 Oct. 2014
"RESPIRATORY SYSTEM." Respiratory System. N.p., n.d. Web. 03 Oct. 2014.
Yeh, Jennifer, "Arthropoda." The Columbia Encyclopedia, 6th Ed.. 2014, "Arthropods." UXL Encyclopedia of Science. 2002, Richard Robinson, "arthropod." A Dictionary of Biology. 2004, Michael Allaby, AILSA ALLABY;MICHAEL ALLABY, "arthropod." World Encyclopedia. 2005, "arthropod." The Oxford Pocket Dictionary of Current English. 2009, and "arthropod." Oxford Dictionary of Rhymes. 2007. "Arthropoda." Encyclopedia.com. HighBeam Research, 01 Jan. 2002. Web. 03 Oct. 2014.