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
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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 webSlide15Slide16Slide17
Egg sacsSlide18Slide19
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 hostSlide29Slide30Slide31
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 CrabSlide45Slide46
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