Subphylum Chelicerata

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Class: Merostomata

Limulus

Class: Pycnogonida

Sea Spiders

Class: Arachnida

Order: Araneae

Latrodectus, Loxosceles reclusa

Order: Scorpionida

Scorpions

Order: Opiliones

Harvestmen

Order: Acari

Ticks and mites

Order: Pseudoscorpionida

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