Dong vat hoc 02

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Phylum Arthropoda

BIO 2215
Oklahoma City Community College
Dennis Anderson
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Jointed Legs
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Number of species
Arthropoda
Echinodermata
Ciliophora
Porifera
Annelida
Sarcomastigophora
Apicomplex
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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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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
From A Life of Invertebrates, Copyright © 1979, W. D. Russell-Hunter.
Modifications of Exoskeleton
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Compound Eye
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Metamorphosis
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Monarch Butterfly
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Myxozoa
Arthropoda
Annelida
Mollusca
Lophophores
Hemichordata
Vertebrata
Other
pseudocoelomates
Nematoda
Porifera
Ctenophora
Cnidaria
Placozoa
Platyhelminthes
Nemertea
Ciliophora
Sarcomastigophora
Microspora
Apicomplexa
Mesozoa
Echinodermata
Crustacea
Chelicerata
Uniramia
Other Chordata
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Arthropod Groups
Subphylum Trilobita
Subphylum Crustacea
Subphylum Chelicerata
Subphylum Uniramia
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Subphylum Trilobita
Extinct
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
Dates back to Triassic
245 MYA
Carapace
Telson
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Class Arachnida
Spiders
Scorpions
Ticks
Mites

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Class Arachnida
4 pair of legs
2 body segments
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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Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.
Photo (a) © SS#11/PhotoDisc
Order Scorpionida
Large pedipalps
Abdominal stinger
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Order Araneae
Spiders
Fangs with poison glands
Silk glands
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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
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
Dermacentor andersoni
Dog tick
Wood tick
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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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Crayfish
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Fig. 19.5
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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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Copepod
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Barnacles
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Barnacle
Cement gland
Ovary
Cirri
Mouth
Stomach
Anus
Testis
Penis
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Fig. 19.24a
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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