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Phylum Arthropoda
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Jointed Legs
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Number of species Mollusca Chordata Platyhelminthes Nematoda
Arthropoda Porifera Annelida Echinodermata Sarcomastigophora Apicomplex Ciliophora
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Characteristics of Arthopods
Segmented, bilateral body Jointed appendages Exoskeleton Open circulatory system Ventral nerve cord Compound eyes
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Arthropods Most Successful Animals
Number of species Diversity Distribution Longevity
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Reasons for Success Versatile exoskeleton Segmentation
Oxygen piped directly to cells (terrestrial) Highly developed sensory organs Complex behavior Metamorphosis
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Fig
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Modifications of Exoskeleton
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Modifications of Exoskeleton From A Life of Invertebrates, Copyright © 1979, W. D. Russell-Hunter.
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Compound Eye
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Metamorphosis
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Monarch Butterfly
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Echinodermata Uniramia Chelicerata Vertebrata Crustacea Other Chordata
Lophophores Crustacea Other Chordata Arthropoda Annelida Hemichordata Mollusca Other pseudocoelomates Nemertea Platyhelminthes Nematoda Ctenophora Cnidaria Mesozoa Placozoa Sarcomastigophora Ciliophora Porifera Apicomplexa Microspora Myxozoa
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Arthropod Groups Subphylum Trilobita Subphylum Crustacea
Subphylum Chelicerata Subphylum Uniramia
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Subphylum Trilobita Extinct One pair of antennae Biramous appendages
200 MYA One pair of antennae Biramous appendages
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Subphylum Chelicerata
Chelicerae No antenna No mandibles 4 pair of walking legs 1 pair of pedipalps
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Class Merostomata Limulus Carapace Telson Dates back to Triassic
245 MYA Carapace Telson
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Fig. 18.2a
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Fig. 18.2b
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Class Arachnida Spiders Scorpions Ticks Mites
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Class Arachnida 4 pair of legs 2 body segments Most are predators
Except mites & ticks Most are predators Inject enzymes into prey Suck fluid into pharynx
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Arachnid Body Regions Prosoma or Cephalothorax Ophisthosoma or Abdomen
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Order Scorpionida Large pedipalps Abdominal stinger
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Order Scorpionida Large pedipalps Abdominal stinger Photo (a) © SS#11/PhotoDisc
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Order Araneae Spiders Fangs with poison glands Silk glands
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Fig. 18.4
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Fig. 18.5
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Copyright © The McGraw-Hill Companies, Inc
Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Arachnid Book Lung
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Dugesiella Tarantula
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Latrodectus mactans Black widow spider Neurotoxin
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Loxosceles reclusa Fiddle back spider Necrotoxin Brown recluse Brown
Violin Necrotoxin
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Loxosceles reclusa Necrosis of tissue
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Day 3
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Day 4
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Day 5
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Day 6
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Day 9
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Day 10
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Order Acari Ticks Mites Body segments fused
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Rocky Mountain Spotted Fever
Ticks are vector High fever Headache Muscle pain Rash BEGINS ON EXTREMETIES 25% fatal without antibiotics
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Dermacentor variabilis
Dog tick Dermacentor andersoni Wood tick
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Fig
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Dermatophagoides Dust mite Allergies to fecal products
1 gram of dust holds 250,000 droppings
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Trombicula Chigger mite Larva feed on skin Dermatitis
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Subphylum Crustacea
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Subphylum Crustacea Two pair of antennae Biramous appendages
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Fig. 19.3
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Fig. 19.1
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Crayfish
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Fig. 19.2a
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Fig. 19.2b
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Fig. 19.5 Fig. 19.5
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Fig. 19.6
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Fig. 19.7 Fig. 19.7
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Lobster
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Shrimp
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Crab
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Pill Bug
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Fig c
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Fig c
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Copepod
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Barnacles
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Barnacle Cirri Testis Penis Anus Mouth Stomach Ovary Cement gland
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Fig a Fig a
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Subphylum Uniramia One pair of antennae Uniramous appendages
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Class Chilopoda One pair of legs per body segment Poison fang
Flattened bodies Carnivores
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Class Diplopoda Two pair of appendages per body segment
Cylindrical body Herbivores
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The End
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