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From Greek “Arthro-jointed”, “podis”-feet
Segmented body.
Paired segmented appendages.
Chitinous exoskeleton.
Open circulatory system, a tubular dorsal blood
vessel.
Striated muscles in skeletal system.
Respiration by gills, tracheae, or spiracle.
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Insects (winged arthropods)
Arachnids (spiders, ticks, mites, etc.)
Crustaceans (isopods, crabs, lobsters)
Millipedes
Centipedes
CUES, http://www.entomology.umn.edu/cues/IPM-turf/sodwebworms.htm
Sod Webworm Moth, Crambus sp.
Cottonwood Leaf Beetle,
Chrysomela scripta
• Two main body sections.
• Five to seven pairs of legs.
• Two
O.F.A.H.
http://www.invadingspecies.com/
pairs of
antennae.
• Simple
eyes.
• Gills
Crayfish
Pillbugs are land dwelling crustaceans complete with gills, that’s
why they stay in humid areas under rocks!
• One pair of legs per body
segment.
• Flattened body.
• First pair of legs modified as
venomous fangs.
• Nocturnal predators.
• Few are dangerous to humans.
Garden Centipede,
Lithobius forficatus
Department of Entomology,
University of Nebraska-Lincoln
Georgia Forestry
Commission Archives
Georgia Forestry
Commission
www.forestryimages.org
Fangs of Scolopendrid Centipede (above)
House Centipede,
Scutigera coleoptrata (right)
Department of Entomology,
University of Nebraska-Lincoln
• Two pairs of legs per body segment.
• Cylindrical body. Rounded appearance
• Feed on
decaying
plant
material.
• Herbivorous
• Nocturnal.
• Harmless.
Emily G. Tenczar
Pet African Giant Millipedes
Photos by William Leonard, Tree of Life Web Project, http://tolweb.org/tree/phylogeny.html
Pseudoscorpion
Tick
Mite
Yellow Garden Spider
Ronald F. Billings
Texas Forest Service
www.forestryimages.org
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Mouthparts are called
chelicerae.
Most contain venom.
Antennae are absent.
Four pairs of legs.
1 to 2 body segments.
Blacklegged
Tick, Ixodes
scapularis
Scott Bauer, USDA Agricultural
Research Service,
www.insectimages.org
Yellow Garden Spider,
Argiope aurantia
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Two body regions
(cephalothorax, abdomen).
Fangs (chelicerae), most
are venomous.
Most are not dangerous.
Jumping Spider, Phidippus
Most make webs.
audax
Most have poor eyesight;
hairs compensate for it
(jumping spiders are an exception).
Potentially dangerous spiders (bites are uncommon):
Brown recluse spider, Black widow spider
David Cappaert, www.insectimages.org
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Mites have only one
noticeable body
region.
Many are
microscopic or close
to it.
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One apparent body
region.
Abdomen and
cephalothorax short.
Common and harmless.
Nocturnal.
Feed on detritus, fruit,
or other animals.
Leiobunum sp.
Joseph Berger, www.insectimages.org
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One apparent body
segment
Looks like scorpion
without tail
Very small soil dweller
Pedipalps or pinchers
resemble those of
scorpions
 Source of venom
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Harmless predators of
soil insects
Notice Size
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Six legs
Protruding mouthparts, unlike non-insect hexapods.
Most have wings.
David Cappaert, www.insectimages.org
Milkweed Leaf Beetle,
Labidomera clivicollis
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Small- Soil dwelling.
Furcula or fork-like springing structures.
Simple eyes.
Antennae.
Wingless adults.
Compact body
Feed on
decomposing
materials.
David R. Maddison, Tree of Life Web Project
http://tolweb.org/tree/phylogeny.html
Japanese Beetle,
Popillia japonica, Adult (left)
and Scarab Larva (below)
Elytra
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Hardened forewings
(elytra).
Elytra divided evenly
down the back
Winged adults.
Chewing mouthparts.
Note elytra
division pattern
like a “T” shape
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Piercing/Sucking
mouthparts.
Usually winged adults.
Wings criss-cross
against back, form an
hour-glass outline.
Nymphs and adults
similar in appearance.
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Most bugs feed on plants.
Some are predaceous.
Note “X” to hour glass
shape of back and elytra
CUES, http://www.entomology.umn.edu/cues/dx/vk/fourbug.htm
CUES
http://www.entomology.umn.edu/cues/dx/vk/whitemark.htm
Fourlined Plant Bug,
Poecilocapsus lineatus
Predaceous Stink Bug attacking
caterpillar
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Three tail-like
appendages.
Body flattened and
covered with scales (like
butterflies)
Wingless adults.
Three tails (fillaments)
Found in
wet places.
Lepisma saccharina
Clemson University - USDA Cooperative Extension Slide Series
www.insectimages.org
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“Skin-like” front wings.
Abdomen ending in pinchers (cerci)
Chewing mouthparts.
Striped Earwig,
Labidura riparia
Joseph Berger, www.insectimages.org