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9. Arthropods Largest and most successful phylum in the animal kingdom. 85% of all animals! Largest and most successful phylum in the animal kingdom.

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Presentation on theme: "9. Arthropods Largest and most successful phylum in the animal kingdom. 85% of all animals! Largest and most successful phylum in the animal kingdom."— Presentation transcript:

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2 9. Arthropods Largest and most successful phylum in the animal kingdom. 85% of all animals! Largest and most successful phylum in the animal kingdom. 85% of all animals! Exoskeleton made of Chitin (light/hard polysaccharide). Exoskeleton made of Chitin (light/hard polysaccharide). Jointed Appendages. Jointed Appendages. Cephalization-compound eyes, ocelli (eyespots), antennae. Cephalization-compound eyes, ocelli (eyespots), antennae.

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4 SUBPHYLUM CHELICERATE Fang-like mouthparts (Chelicerae)-Pedipalps for sense. 2 Classes. Fang-like mouthparts (Chelicerae)-Pedipalps for sense. 2 Classes. Class Merostomata- Horseshoe crabs. Class Merostomata- Horseshoe crabs. Class Arachnids-8 legs Class Arachnids-8 legs 2 body parts-spiders, ticks, mites, scorpions. 2 body parts-spiders, ticks, mites, scorpions. Book lungs/gills Book lungs/gills

5 Horseshoe Crab 1. Carapace 1. Carapace 2. Telson 2. Telson 3. Compound eye 3. Compound eye 4. Anterior spine 4. Anterior spine

6 ARACHNIDS Spiders Spiders Scorpions Scorpions Ticks Ticks

7 SUBPHYLUM MANDIBULATES Antennae, Mandibles & Maxillae Antennae, Mandibles & Maxillae Includes 4 classes-Crustacea, Diplopoda, Chilopoda & Insecta. Includes 4 classes-Crustacea, Diplopoda, Chilopoda & Insecta. Crustaceans-add some limestone to the chitinous exoskeleton. Crustaceans-add some limestone to the chitinous exoskeleton. Lobsters & crabs are the giants of this group-most are a few centimeters long. Lobsters & crabs are the giants of this group-most are a few centimeters long.

8 Crustaceans In addition to lobsters & crabs, shrimp, copepods and barnacles all belong to this class. In addition to lobsters & crabs, shrimp, copepods and barnacles all belong to this class. Due to the nature of their rigid exoskeleton, crustaceans must molt or shed their shell in order to grow. Due to the nature of their rigid exoskeleton, crustaceans must molt or shed their shell in order to grow. They use an enzyme to split their shell & then crawl out. They use an enzyme to split their shell & then crawl out.

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10 MILLIPEDES & CENTIPEDES Class Diplopoda-The millipedes only have about 100 legs with 2 pairs-legs/segment Class Diplopoda-The millipedes only have about 100 legs with 2 pairs-legs/segment Class Chilopoda-The centipedes have fewer legs (1 pair/segment). Class Chilopoda-The centipedes have fewer legs (1 pair/segment). While millipedes scavenge on decaying plant material, centipedes are predators w/venom glands. While millipedes scavenge on decaying plant material, centipedes are predators w/venom glands.

11 CLASS INSECTA Class Insecta-largest group of animals in the world! Class Insecta-largest group of animals in the world! 3 Body parts-Head, Thorax & Abdomen 3 Body parts-Head, Thorax & Abdomen 6 legs, Antennae, Mandibles 6 legs, Antennae, Mandibles Malpighian tubules (Kidneys) get rid of their wastes. Malpighian tubules (Kidneys) get rid of their wastes.

12 INSECT ANATOMY

13 METAMORPHOSIS One last reason for arthropod success is their ability to go through stages that exploit different food at different times in their life. One last reason for arthropod success is their ability to go through stages that exploit different food at different times in their life. Incomplete Metamorphosis-Egg-Nymph-Adult. The nymph stage is like a miniature form of the adult. Incomplete Metamorphosis-Egg-Nymph-Adult. The nymph stage is like a miniature form of the adult. Complete Metamorphosis-Egg-Larvae-Pupae-Adult. Complete Metamorphosis-Egg-Larvae-Pupae-Adult.


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