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An arthropod is an invertebrate with an exoskeleton, a segmented body, and
jointed legs.
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There are more than 1 million kinds of arthropods on Earth.
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An exoskeleton is a hard, outer covering.
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Molting is to leave an exoskeleton and grow a new one.
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A crustacean is an arthropod that has a hard, exoskeleton, two pairs of antennae, and a mouth for crunching and grinding.
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Crustaceans can _____________ certain parts of their body.
A ___________ can re-grow its claws.
Most crustaceans live in ____________ and get oxygen from the water through _________.
Gills are
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What is Entomology?
The study of insects (and their near relatives).
What are insects (and near relatives)?
Insects and their relatives areARTHROPODS.
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4 Orders - Spiders Araneae Scorpions Scorpionida Daddy Long legs Opiliones Ticks and Mites Arcarina
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Characterisitics of spiders ( Order Araneae )
6 pairs of appendages
4 pairs of walking legs 1 pr. of chelicera ( most anterior head appendage) 1 pr. of pedipalps no antennae
no segmentation
head-chest fused to form cephalothorax
breathe with book lungs or trachea
poison glands with fangs ( on the chelicera )
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Trapdoor spider
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Black andYellowArgiope
(Garden Spider )
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Brown recluse spider
Violin shape on dorsal side
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Order Scorpionidae - segementation prominent
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Harvestmen – Daddy Long legs
Order Opiliones - feed more as scavengers
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Adult female deer tick
Order Arcarina
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Cutting proboscis in mouth of tick
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Female dog tick
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Classes of Myriapods(many legged arthropods)
(all have one pair of antennae, a head region, and trunk with many pairs of legs, use trachea)
Diplopoda - millipedes
Chilopoda - centipedes
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Myriapods
Millipede (Diplopoda)
Two pair of legs per visible segment, attached under body.
Centipede (Chilopoda)
Pair of fangs under head, one pair legs per visible segment - attached to side of body.
No fangs, no eyes, legs attached to side of body.
[one pair of antennae, head & trunk regions, trunk with many pairs of legs]
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Millipede (Diplopoda)
Centipede (Chilopoda)
Garden centipede
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Classes of Crustacea• mostly marine, fresh water, a few terrestrial• all have two pair of antennae• five or more pairs of legs• segmented abdominal appendages• head & trunk or cephalothorax & abdomen body arrangement• have gills
Sowbugs or pillbugs
Sand fleas
Barnacles
Crabs, lobster, shrimp
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Crayfish cephalothorax(Decapoda)
Sowbug (Isopoda), a terrestrial crustacean