General Characteristics General Characteristics
Segmented bodiesSegmented bodies Jointed appendagesJointed appendages Hard external skeleton (exoskeleton Hard external skeleton (exoskeleton
made of chitin)made of chitin)
General CharacteristicsGeneral Characteristics
MoltingMolting Open circulatory systemOpen circulatory system Brain with gangliaBrain with ganglia Compound eyesCompound eyes
General CharacteristicsGeneral Characteristics
Some aquatic arthropods have gillsSome aquatic arthropods have gills Terrestrial arthropods have Terrestrial arthropods have trachaetrachae
(exchange CO(exchange CO22 and O and O22 change through change through
holes called holes called spiraclesspiracles).).
Examples of ArthropodsExamples of Arthropods
560 million years old560 million years old CrustaceansCrustaceans- live in the ocean- live in the ocean
Crayfish, crabs, lobsters, barnaclesCrayfish, crabs, lobsters, barnacles ArachnidsArachnids
Spiders, ticks, scorpians, mitesSpiders, ticks, scorpians, mites InsectsInsects Myriapods- many legsMyriapods- many legs
Centipedes, millipedesCentipedes, millipedes
Extinct ArthropodsExtinct Arthropods
TrilobitesTrilobites
EurypteridsEurypterids
**Horseshoe crabs are the only closest living relatives.
ReviewReview
1) List 3 characteristics of arthropods that 1) List 3 characteristics of arthropods that unite them as a single large group.unite them as a single large group.
2) Name 1 group of arthropod that is now 2) Name 1 group of arthropod that is now extinct. Name at least 3 groups still in extinct. Name at least 3 groups still in existence today. existence today.
Keys to Insect SuccessKeys to Insect Success
Ability to fly (1 or 2 pairs of wings)Ability to fly (1 or 2 pairs of wings) Diverse feeding habitsDiverse feeding habits
Many types of mouthpartsMany types of mouthparts
Digestive enzymes to eat unusual foodDigestive enzymes to eat unusual food
Keys to Insect SuccessKeys to Insect Success
Video clipVideo clip Metamorphosis- body form changes from Metamorphosis- body form changes from
juvenile to adultjuvenile to adult Larva, pupa, adultLarva, pupa, adult
Impact of InsectsImpact of Insects
Bees & flowersBees & flowers Termites & woodTermites & wood Insect Medicine?Insect Medicine? Diseases/ pestsDiseases/ pests EntomologyEntomology- study and classification of - study and classification of
insectsinsects
Grasshopper HeadGrasshopper Head
Compound eyesCompound eyes Simple eyesSimple eyes MandibleMandible PalpsPalps Antennae Antennae
Grasshopper ThoraxGrasshopper Thorax
Tympannic Tympannic membranemembrane
Jumping legsJumping legs Walking legsWalking legs 2 pairs of wings2 pairs of wings
Grasshopper AbdomenGrasshopper Abdomen
SpiraclesSpiracles Ovipositor (if female)Ovipositor (if female)