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