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Arachnida Arachnida

Arachnida - PowerPoint Presentation

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Uploaded On 2017-05-29

Arachnida - PPT Presentation

Spiders ticks mites scorpions Spider structure Cephalothorax Anterior region of the body Abdomen Posterior region of the body Eyes 8 simple eyes on the cephalothorax Pedipalps Foot like appendages used for feeling sensing chemicals holding food communication and mating ID: 553788

body spider region crab spider body crab region egg diseases crayfish abdomen crustacean pedipalps legs humans venom cephalothorax tick

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Presentation Transcript

Slide1

Arachnida

Spiders, ticks, mites, scorpionsSlide2

Spider structureSlide3

Cephalothorax

Anterior region of the bodySlide4

Abdomen

Posterior region of the bodySlide5

Eyes

8 simple eyes on the cephalothoraxSlide6

Pedipalps

Foot like appendages used for: feeling, sensing chemicals, holding food, communication and matingSlide7

Chelicerae

The fangs for injecting venom – all spiders are carnivores Slide8

Sucking stomach

Sucks in liquefied foodSlide9

Digestive gland

Secretes enzymes to finish digestionSlide10

Dorsal heart

Enlarged blood vessel (aorta)Slide11

Book lungs

(breathing), opening is on the abdomenSlide12

Silk glands and spinnerets

Found on abdomen, used for: wrapping prey, making webs, egg sacs, safety lines, ballooningSlide13

Wrapping preySlide14

Spinning a webSlide15
Slide16
Slide17

Egg sacsSlide18
Slide19

Safety lineSlide20

BallooningSlide21

Spider reproduction

Male transfers sperm to females seminal receptacle with

pedipalps. Later, female releases egg and sperm into egg sac where fertilization occurs.Slide22

Spider affects on humans

Positive – controls insect populations Slide23

Spider affects on humans

Negative – black widow is most dangerous in U.S., brown recluse is 2

nd, hobo spider is 3rd Slide24

Spider bitesSlide25

Goliath Bird-Eating SpiderSlide26

Other arachnidsSlide27

Harvestmen (daddy-long-legs)

Not a spider – doesn’t have 2 distinct body regions and doesn’t produce silk or venomSlide28

Ticks

Parasites, suck blood from their hostSlide29
Slide30
Slide31

Tick diseases

Lymes disease

Rash that looks like a “bull’s eye”

Muscle ache

Stiff neckMigraineFlu like symptoms

Fatigue Slide32

Tick diseases

Rocky Mountain spotted fever

Fever

NauseaVomitingLoss of appetite

Spotted rash Slide33

Tick diseases

Bubonic plague

Buboes – caused by swollen lymph nodes

Gangrene in fingers and toesSlide34

Mites

Some do crop damageSlide35

Mite diseases

Chiggers – mite larvae that bore into the skin causing severe itchingSlide36

Scorpions

Sting forward over their head, some are dangerous to humansSlide37

Predators

Their pincers are their main weapons which are really extensions of their mouths (

pedipalps)Slide38

Watch out for the small ones…

Arizona Bark Scorpion is the only species in the U.S. that is considered threatening

The larger the pincers, the less venom they haveSlide39

Nocturnal

Can easily be seen at night with a black light – exoskeleton causes them to glowSlide40

Crustacea

Lobsters, crab, shrimp, crayfishSlide41

Non-typical crustaceans

Pill bugs (

rolly

polly), barnacles, daphnia, cyclops Slide42

Zooplankton

Organisms that drift with ocean currents and can’t photosynthesize – most are crustaceans and are VITAL to aquatic systemsSlide43

Largest Crab

Japanese Spider Crab

Leg span of almost 4 metersSlide44

Hermit CrabSlide45
Slide46

Coconut Crab

known for its ability to crack coconuts with its strong pincers in order to eat the contentsSlide47

Crayfish structure

Red is most common, then blue, then whiteSlide48

Cephalothorax

Anterior body region of a crustaceanSlide49

Abdomen

Posterior body region of a crustaceanSlide50

Carapace

Top shell of a crustaceanSlide51

Antennae

Feeling and sensing chemicalsSlide52

Antennules

Sense vibrations – gives them balanceSlide53

Chelipeds

Claws used for tearing food and for defenseSlide54

Legs

4 pair for walking, 1 pair for grabbing (chelipeds

)Slide55

Swimmerets

Aid in swimming, females carry eggsSlide56

Green gland

Excretory organs that get rid of nitrogenous wastesSlide57

Crayfish respiration

Gills are under the carapace and attached to legsSlide58

Crayfish circulation

Dorsal heart inside the pericardium, open circulatory systemSlide59

Self amputation and regeneration

If a cheliped

is damaged, they remove it and regrow another one

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