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Phylum Arthropoda Trilobites, Chelicerates, & MyriapodsDonald Winslow 7 March 2008 Hickman et al. 2008 Ch. 19 pp Crustaceans: Ch. 20 pp , Insects: Ch. 21 pp
Phylum Arthropoda Diversity & abundanceExoskeleton & chitin, ecdysis (molting) Somites, tagmata, jointed appendages Complex muscular system, no cilia Open circulatory system & hemocoel Mouthparts, complete digestive tract Excretory glands & Malpighian tubules
Arthropod respirationBody surface Gills Lungs Tracheae
Arthropod nervous systemCerebral ring Two ventral nerve chains Complex sensory organs Ocelli & compound eyes Complex behavior
Arthropod reproductionUsually dioecious w/ internal fertilization Oviparous or ovoviviparous or viviparous Sometimes parthenogenesis Development often by metamorphosis
Phylum Arthropoda Subphylum Trilobita Subphylum Myriapodaextinct marine animals Subphylum Myriapoda Centipedes & millipedes Subphylum Chelicerata Horseshoe crabs, spiders, scorpions, etc. Subphylum Crustacea—crustaceans Subphylum Hexapoda—insects
Subphylum Chelicerata2 chelicerae, 2 pedipalps 8-10 legs No mandibles or antennae Class Merostomata Subclass Xiphosurida (horseshoe crabs) Class Pycnogonida (sea spiders) Class Arachnida Spiders, scorpions, harvestmen, ticks & mites
Horseshoe crabs Carapace Abdomen Telson Eyes 10 legs Book gills
Sea spiders Males carry egg masses w/ ovigers Class Pycnogonida
Class Arachnida Order Araneae Order Scorpiones Order Opilionesspiders Order Scorpiones scorpions Order Opiliones Harvestmen (Daddy long-legs) Order Acari Ticks & mites
Spiders Pedicel joins cephalothorax & abdomenBook lungs and/or tracheae & spiracles Malphigian tubules & excretory glands 8 ocelli, sensory setae, poison, webs Brain, suboesophageal ganglion Sinuses Sperm from M pedipalps to F receptacle
Spider feeding & defenseInsect predation Dangerous spiders Black widow Brown recluse (fiddleback)
Scorpions Cephalothorax Preabdomen Postabdomen with stinger
Order Opiliones Harvestmen or Daddy Long-legs Scavengers
Ticks & mites Terrestrial or aquatic, sometimes parasiticMouthparts on capitulum Cephalothorax & abdomen fused Chiggers, scabies, Lyme disease Rocky Mountain Spotted Fever Dust mites, follicle mites
Myriapods Head & trunk, many somites Class Chilopoda (centipedes)Predators, poison fangs, 2 legs per segment Class Diplopoda (millipedes) 4 legs per abdominal segment
9. Arthropods Largest and most successful phylum in the animal kingdom. 85% of all animals! Exoskeleton made of Chitin (light/hard polysaccharide). Jointed.
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Phylum Arthropoda (The Arthropods) By far and away, the most successful animal group ever to live Consists of over 1 million named species, 2 of every.
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Arthropod phylogeny & Insect Evolution. Objectives: Identify characteristics of the Arthropoda Discuss Arthropod Phylogeny Characteristics of major taxa.
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Phylum Arthropoda 1 Arthropoda Overview Subphylum Chelicerata Class Merostomata Class Pycnogonida.
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The Arthropods Arthro = jointed, Pod = foot
How to Use This Presentation
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