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Subphylum Chelicerata (Body Structure (5 Layers of exoskeleton secreted by…
Subphylum Chelicerata
Body Structure
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Tagmatization
Segments, tagmata, divide labor -- results from fusion of somites
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Joints - areas of thin cuticle for movement --- specialized on different regions for different functions
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Body Systems
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Circulation
Open circulatory system
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Tubular heart, arteries, and sinuses
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Respiration
Book gills, book lungs, or tracheae
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Taxonomic Divisions
Class Merostomata
Large, hardened carapace covering ventral appendages; book gills on the ventral opisthosoma for respiration; pedipalps and four subsequent appendages serve as walking legs; so technically five pairs of walking legs; which are all chelate except for last pair
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Class Arachnida
Prosoma has six pairs of appendages: a pair of pedipalps, 4 walking legs, strong sucking pharynx for liquid
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Order Pseudoscorpiones
Chelate pedipalps, but lack stinger and book lungs
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