Characteristics and classes of Arthropods. By Michael Dewar. Class Arachnida. Spiders, scorpions, mites, and ticks belong to this class. Spiders have 2 body regions, 6 pairs of jointed appendages, no mandibles for chewing 1 st pair of appendages are chelicerae, 2 nd pair are pedipalps.
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By Michael Dewar
Spiders, scorpions, mites, and ticks belong to this class.
Spiders have 2 body regions, 6 pairs of jointed appendages, no mandibles for chewing
1st pair of appendages are chelicerae, 2nd pair are pedipalps.
Make webs from spinnerects,
Aquatic, exchange gas a water flows over feathery gills. 2 pairs of antennae, have mandibles for chewing.
Have two compound eyes, jaws open and close from side to side,
5 pairs of walking legs used for walking, seizing prey, cleaning other appendages.
Crabs, lobsters, shrimps, crayfishes, barnacles, water fleas, and pill bugs are in this class.
Some crustaceans have 3 body sections others only have two. Sow bugs and pill bugs are the only land crustaceans, must live where there is moisture which aids in gas exchange
Centipedes are the only animals in this class.
Flattened bodies, many jointed legs.
Carnivorous eaters, and eat soil arthropods; snails, slugs, and worms.
Millipedes are the only animals in this class.
Millipedes eat mostly plants and dead material on damp forest floors.
Millipedes do not bite, but they can spray obnoxious-smelling fluids from their defensive stink glands.
Have cylinder shape bodies.