ArthropodsArthropods

Body PlansBody Plans

3 main 3 main characteristicscharacteristics

exoskeletonexoskeletonChitinChitinCan be hard or Can be hard or leatheryleathery

Used like armorUsed like armor

Molting for growingMolting for growing

Jointed Jointed appendagesappendages

Arthro “joint”Arthro “joint”

Pod “foot”Pod “foot”

ex. Antennae, claws, ex. Antennae, claws, legs, wings, flippers legs, wings, flippers

Segmented Segmented bodiesbodies

Insects –3Insects –3

Arachnids –2Arachnids –2

Centipedes 100Centipedes 100

FeedingFeeding

Parasites, Parasites, carnivores, carnivores, filter filter feeders, feeders, herbivoresherbivores

RespirationRespiration

Aquatic arthropodsAquatic arthropods

Gills just under Gills just under skeletonskeleton

Book gills (horseshoe Book gills (horseshoe crab) and book lungs crab) and book lungs (spiders)(spiders)

Appearance is book likeAppearance is book like

Spiracle hole for air Spiracle hole for air entranceentrance

InsectsInsectsSpiracle & Spiracle & Tracheal tubesTracheal tubes

Muscle movement Muscle movement pumps airpumps air

Internal transportInternal transportOpen circulatory Open circulatory systemsystem

Blood out through Blood out through arteries & then arteries & then collect backcollect back

ResponseResponseAll have ganglia All have ganglia brainbrainBody segments have Body segments have brainsbrainsWasp w/out head can Wasp w/out head can livelive

Sophisticated Sophisticated sensessenses

Compound eyesCompound eyes

Taste Taste receptorsreceptorsOn mouth On mouth antennae & antennae & legs (flies)legs (flies)

MovementMovementSpider legsSpider legsfliesflies

Growth & Growth & developmentdevelopment

Molting- shedding Molting- shedding small shellsmall shell

Vulnerable time w/ Vulnerable time w/ soft shellsoft shell

MetamorphosisMetamorphosis

EggEgg

LarvaeLarvae

PupaPupa

AdultAdult

SubphylumsSubphylums

Subphylum: Subphylum: ChelicerataChelicerata

CharacteristicsCharacteristics2 body parts2 body parts

CephalothoraxCephalothorax

AbdomenAbdomen

2 sets of appendages 2 sets of appendages on mouthon mouth

Chelicerae & Chelicerae & pedipalpspedipalps

ExamplesExamples

Horseshoe crabsHorseshoe crabs

ArachnidsArachnids

spidersspiders

Mites & TicksMites & Ticks

ScorpionsScorpions

Subphylum: Subphylum: CrustaceaCrustacea

Over 35,000 speciesOver 35,000 species

Water fleas .25mmWater fleas .25mm

Japanese spider Japanese spider crab 6 meters acrosscrab 6 meters across

examplesexamples

Crabs lobster Crabs lobster barnacles crayfish barnacles crayfish shrimpshrimp

CharacteristicsCharacteristics

Cephlothorax & Cephlothorax & abdomenabdomen

Hard exoskeletonHard exoskeletonCalcium carbonateCalcium carbonate

2 pair of Antennae2 pair of AntennaeUsed for sensory Used for sensory feeding or locomotionfeeding or locomotion

Mandible- mouth Mandible- mouth part for feedingpart for feeding

Short heavy Short heavy structurestructure

appendagesappendages

Barnacles- filter Barnacles- filter feedingfeeding

Crabs lobster clawsCrabs lobster claws

swimmeretsswimmerets

Subphylum: Subphylum: Uniramia Uniramia

Insects & friendsInsects & friends

examplesexamples

Insects, millipedes, Insects, millipedes, centipedescentipedes

CentipedesCentipedes

Carnivores w/ poisonCarnivores w/ poison

15-170 pairs of legs15-170 pairs of legs

Each segment has 1 Each segment has 1 pair of legspair of legs

MillipedesMillipedes

ScavengersScavengers

2 pairs of legs per 2 pairs of legs per segmentsegment

InsectsInsects

900,000 insect 900,000 insect speciesspecies

New species found New species found weeklyweekly

BodyBody3 part body3 part bodyHead thorax & Head thorax & abdomenabdomen3 pairs of legs at 3 pairs of legs at thoraxthorax