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14 Cards in this Set

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Arthropoda
Metarism with tagmatization, jointed exoskeleton, ventral nervous system
Sub: Trilobitomorpha
Biramous appendages, 3 lobes (rami): Head, thorax, abdomen, 1 pair antennae
Sub: Chelicerata
Prosoma + Opisthosoma
Prosoma/ cephalothorax
Sensory, feeding, locomator tagma
Chelicerata
Opisthosoma
Digestive, reproductive, excretory, respiratory organs
Posterior to prosoma
Pedipals
Sensory; feeding, locomotion, reproduction
2nd pair
Chelicerae
Pincerlike/ chelate, feeding (sucking)
1st pair
Characteristics of Athropoda
Metarism, Chitin exoskeleton,
paired, jointed appendages
Growth by ecdysis/ molting,
Ventral nervous system,
Coelem around excretory organs/ gonads
Open circulatory system (hemocoel from blastocoel),
complete digestive tract,
metamorphosis
Epicuticle
Outer most layer, waxy, impermeable to water, barrier
Procuticle
Chitin, sclerotization, calcium carbonate
Hypodermis
Secretes exoskeleton, layer of epidermal cells
Sensilla
Sensory receptors of exoskeleton, gas exchange
Hemocoel
From blastocoel, internal cavity for open circulatory system, exchanges nutrients, wastes, gases
Carapace over prosoma, telson, book gills
Merostomata
Xiphosura - horseshoe crabs
Eurypterida - giant water scorpion