Arthropoda Classification Phylum Arthropoda Subphylum Uniramia terrrestrial mandibulates Class Chilopoda centipedes Class Diplopoda millipedes Class Insecta insects Subphylum Crustacea ID: 771545
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Arthropoda Classification Phylum Arthropoda Subphylum Uniramia - ( terrrestrial mandibulates ) Class Chilopoda - centipedes Class Diplopoda - millipedes Class Insecta - insects Subphylum Crustacea - ( aquatic mandibulates ) lobsters, crabs, crayfish, shrimp, sow bugs (pill bugs), krill and barnacles Subphylum Chelicerata Class Arachnida - spiders, scorpions, ticks, and mites Class Merostomata - horshoe crab Class Pycnogonida - sea spiders Subphylum Trilobita - trilobites (extinct)
Subphylum Chelicerata ~ Named after mouthparts called chelicerae which appear as claws or fangs. They are used to pinch and pierce.
*Remember Insects and Crustaceans are mandibulates . They have mandibles which they use for chewing.
Ecological Impact Positive Many arachnids help control the populations of many harmful insects NegativeHarmful bites- spider Harmful stings- scorpions Transmit disease- ticks
Subphylum Chelicerata 1 st pr of appendages are chelicera- mouthparts which may appear as claws or fangs4 pr of walking appendagesNo mandibles No antennae Tagmata - specialized grouping of multiple segments: cephalothorax & abdomen Respiration by book lungs 4 pair of simple eyes
Subphylum Chelicerata Class Arachnida Order Araneae
6 Pair of Appendages 1 pair of chelicerae in the form of poisonous fangs 1 pair of pedipalps used for sensory reception and transfer of sperm in the male4 pair of walking legsNo antennae
Most have 8 eyes
Feeding Fangs immobilize prey and then the spider injects digestive juices into the victim Later the spider sucks up the partially digested tissues of the preySome spiders produce silk webs used to catch food Silk glands produce a protein secretion that hardens when it contacts the air Spinnerets- 2 or 3 pair of small projections at the posterior end of the abdomen where silk comes out.
Respiration Book lungs- air enters through a slit in the abdomen and flows between the pagelike folds where oxygen and carbon dioxide are exchangedSome spiders have tracheae- minute tubules that transport oxygen directly to tissues
Reproduction Not hermaphroditic - separate sexes - female often larger than male Pedipalps of male transfer sperm to seminal receptacle of female - Internal fertilization
Regional Poisonous Spiders Lactrodectus mactans Loxosceles reclusa Poison destroys tissue Poison is a neurotoxin
Tan Tarantula Argiope aurantia Aphonopelma anax Golden Orb Spider/Garden Spider
Class Arachnida , Order Opiliones
Class Arachnida , Order Solifugae Eremobates sp “camel spiders” only grow to about 6 inches https://www.youtube.com/watch?v=G7fyLA_GGc4
Class Arachnida , Order Amblypygi “tailless whip scorpion”
Class Arachnida , Order Scorpiones Paninus imperator (Emperor scorpion)
Scorpions Pedipalps modified into pincers Segmented abdomen with a poisonous stinger in its last segment
Bodies fused into unsegmented ovoid shapes Ticks (blood sucking parasites of vertebrates) transmit many different diseasesRocky mountain spotted feverLyme diseaseMites transmit some diseases - mainly just irritants http://www.idph.state.il.us/envhealth/pcmites.htm Class Arachnida , Order Acari Mites and Ticks
Class Arachnida , Order Acari Dermacentor variabilis American dog tick Rhipicephalus sanguineus Brown dog tick Rocky mountain spotted fever http://www.cdc.gov/rmsf/index.html
Ixodes scapularis Deer tick Lyme disease Class Arachnida , Order Acari http://www.cdc.gov/lyme/
Class Arachnida , Order Acari Class Eutrombicula alfreddugesi Chigger Sarcoptes scabiei scabies mite http://www.cdc.gov/parasites/scabies/index.html Chiggers are unique among mites affecting humans and animals, in that the immature stage (the larva) is the only parasitic stage.
Subphylum Chelicerata Class Pycnogonida
Subphylum Chelicerata Class MerostomataLimulus limus – horseshoe crab
Subphylum Chelicerata Class MerostomataSpawning http :// www.youtube.com/watch?v=wA-NoH_G330 Drug Purification Testing http://www.youtube.com/watch?v=90LTtKIFY8U