Arthropods.

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Presentation transcript:

Arthropods

Arthropods Segmented body Tough Exoskeleton: chitin Jointed appendages: legs and antennae Classified: body segments and appendages particularly mouth parts

Arthropods With evolution: Molting: sheds exoskeleton fewer body segments specialized appendages for feeding, movement, and other functions Molting: sheds exoskeleton

Other Characteristics Bilateral Symmetry Feeding: herbivores, carnivores, omnivores Circulation: Open-Circulatory System

More Info Respiration: branched tracheal tubes or book lungs Excretion: Malpighian tubes Response to Stimuli: well developed Movement: muscles contract & pull on exoskeleton Ex: spiders, insects, crustaceans

Crustaceans Crayfish, Crabs, Lobsters, & Barnacles 2 pairs of antennae 2 or 3 body sections Mandibles: chewing mouthparts

Chelicerates Chelicerae: fangs used to stab and paralyze prey Horseshoe Crabs, Spiders, Mites, Ticks, & Scorpions Mouthparts Chelicerae: fangs used to stab and paralyze prey Pedipalps: grab prey 2 body sections; 8 legs

Uniramians Centipedes, Millipedes, & Insects Jaws; 1 pair of antennae Unbranched appendages

Insects Body divided into head, thorax, & abdomen 3 pairs of legs

Metamorphosis Process of changing shape and form Incomplete: similar appearance through out life Nymphs: lack functional sexual organs & wings Complete Larva: undergo finial molt  pupa Pupa  Adult; completely different animal Lady bugs, butterflies

Metamorphosis

Life as an Insect Pheromones: chemical messengers Signal alarm or death Male/female courtship Societies: group that works and lives together ants, bees, termites

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