Crustaceans, Spiders and Insects. Arthropods are the most successful phylum on the planet! 750,000...
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Transcript of Crustaceans, Spiders and Insects. Arthropods are the most successful phylum on the planet! 750,000...
Arthropods are the most successful phylum on the planet!
750,000 species
Arthropods haveSegmented bodyTough exoskeletonJointed appendages
Feeding – complex mouthparts to eat a wide range of food
Respiration Land – air enters through spiracles – holes in the side of the
body. Water – gills or book gills
Circulation – open circulatory system – open sinusesExcretion – Malpighian tubules – saclike organ that
combines urine and waste togetherResponse – have a brain! Sophisticated eyes and
taste receptorsMovement – have muscles…can flex and extendReproduction – internal or external reproduction
depending on the species
1. Crustaceans – primarily aquaticExamples: crabs, shrimps,
crayfishes and pillbugs.Characteristics:
Two pairs of antennae 2 or 3 body sections –
Cephalothorax/Abdomen Chewing mouthparts called
mandibles
Molting – when arthropods outgrow their exoskeleton
Steps to molting1. skin glands digest
inner part of exoskeleton2. other glands create a
new exoskeleton3. animal pulls itself out
of old skeleton4. While new skeleton is
soft – animal fills it with air to allow for growth
2. Spiders and their relatives Characteristics
No antennaeCephalothorax and abdomen2 pairs of mouthpart appendages
Chelicerae – fangs to stab and paralyze preyPedipalps – grab prey
Spiders are in the class ArachnidaSpiders have no jaws so they liquify their
preyScorpions are found in warm climates.
The abdomen has a stinger that can kill and paralyze prey.
3. Insects – There are 3 classes of Insects
1. Chilopoda – centipedes 2. Diplopoda – millipedes 3. Insecta – the insects1. Centipedes – • each body segment has
one pair of legs carnivores live beneath rocks or in
the soil2. Millipedes – each body
segment has two pairs of legsDragon Millipede – produces cyanide when threatened.
Insects have a body divided into three parts
Head – antennae and eyesThorax - three pairs of legs,
wingsAbdomen – stinger or poison
gland
Insects undergo metamorphosis – a process of changing shape and form.
1.Incomplete Metamorphosis – Young (called nymphs) look very much like the adults.
Examples: Grasshoppers