Presentation is loading. Please wait.

Presentation is loading. Please wait.

Phylum Arthropoda Trilobites, Chelicerates, & Myriapods

Similar presentations

Presentation on theme: "Phylum Arthropoda Trilobites, Chelicerates, & Myriapods"— Presentation transcript:

1 Phylum Arthropoda Trilobites, Chelicerates, & Myriapods
Donald Winslow 7 March 2008 Hickman et al. 2008 Ch. 19 pp Crustaceans: Ch. 20 pp , Insects: Ch. 21 pp

2 Phylum Arthropoda Diversity & abundance
Exoskeleton & chitin, ecdysis (molting) Somites, tagmata, jointed appendages Complex muscular system, no cilia Open circulatory system & hemocoel Mouthparts, complete digestive tract Excretory glands & Malpighian tubules

3 Arthropod respiration
Body surface Gills Lungs Tracheae

4 Arthropod nervous system
Cerebral ring Two ventral nerve chains Complex sensory organs Ocelli & compound eyes Complex behavior

5 Arthropod reproduction
Usually dioecious w/ internal fertilization Oviparous or ovoviviparous or viviparous Sometimes parthenogenesis Development often by metamorphosis

6 Phylum Arthropoda Subphylum Trilobita Subphylum Myriapoda
extinct marine animals Subphylum Myriapoda Centipedes & millipedes Subphylum Chelicerata Horseshoe crabs, spiders, scorpions, etc. Subphylum Crustacea—crustaceans Subphylum Hexapoda—insects

7 Subphylum Chelicerata
2 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

8 Horseshoe crabs Carapace Abdomen Telson Eyes 10 legs Book gills

9 Sea spiders Males carry egg masses w/ ovigers Class Pycnogonida

10 Class Arachnida Order Araneae Order Scorpiones Order Opiliones
spiders Order Scorpiones scorpions Order Opiliones Harvestmen (Daddy long-legs) Order Acari Ticks & mites

11 Spiders Pedicel joins cephalothorax & abdomen
Book 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

12 Spider feeding & defense
Insect predation Dangerous spiders Black widow Brown recluse (fiddleback)

13 Scorpions Cephalothorax Preabdomen Postabdomen with stinger

14 Order Opiliones Harvestmen or Daddy Long-legs Scavengers

15 Ticks & mites Terrestrial or aquatic, sometimes parasitic
Mouthparts on capitulum Cephalothorax & abdomen fused Chiggers, scabies, Lyme disease Rocky Mountain Spotted Fever Dust mites, follicle mites

16 Myriapods Head & trunk, many somites Class Chilopoda (centipedes)
Predators, poison fangs, 2 legs per segment Class Diplopoda (millipedes) 4 legs per abdominal segment

Download ppt "Phylum Arthropoda Trilobites, Chelicerates, & Myriapods"

Similar presentations

Ads by Google