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Phylum Arthropoda
Phylum Arthropoda
• Protostome
• Eucoelomate
• Ecdyzoa
• Jointed Appendages
• Thick, chitin exoskeleton
• Tagmata – grouping/fusion of segments
Taxonomy of Artrhopods (Extant)
• Phylum Arthropoda (Extant)– Subphylum Chelicerata
• scorpions, spiders, horseshoe crabs
– Subphylum Crustacea• Aquatic mandibulates
– Subphylum Uniramia• Terrestrial mandibulates
• Phylum Arthropoda (Extinct)– Subphylum Trilobita
Most Life on Earth is an Arthropod
SP Trilobita
Subphylum Chelicerata• 1st pr of appendages are chelicera
• 4 pr of walking appendages
• No mandibles
• No antennae
• Tagmata: cephalothorax & abdomen
SP Chelicerata, Class Merostomata
Limulus limus – horseshoe crab
SP Chelicerata, Class Merostomata
SP Chelicerata, Class Pycnogonida
SP Chelicerata, Class Arachnida, Order Araneae
Aranean Anatomy
Regional Poisonous Spiders
Lactrodectus mactans
Loxosceles reclusa
Brown Recluse Bite Victom
Tan Tarantula
Argiope aurantia
Aphonopelma anax
Golden Orb Spider/Garden Spider
Class Arachnida, Order Opiliones
Class Arachnida, Order Solifugae
Eremobates sp
Class Arachnida, Order Amblypygi
Class Arachnida, Order ScorpionesPaninus imperator (Emperor scorpion)
Lethally Poisonous Scorpions
Centruroides exilicauda
Leiurus quinquestriatus
Class Arachnida, Order Acari
Dermacentor variabilis American dog tick
Rhipicephalus sanguineus Brown dog tick
Rocky mountain spotted fever
Class Arachnida, Order AcariIxodes scapularis Deer tick
Lyme disease
Class Arachnida, Order Acari
Class Arachnida, Order AcariEutrombicula alfreddugesi Chigger
Sarcoptes scabiei scabies mite
Class Arachnida, Order AcariDermatophagoides spp Dust mite