Transcript Simple Invertebrates

Simple Invertebrates
Is a snake an invertebrate?
Characteristics
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Have no backbone
Includes sponges
Cnidarians (jellyfish)
Flatworms
Roundworms, segmented worms and
mollusks (clams)
Sponges
Sponges
• Sketch
• Label top opening, flagella, body, pore
Sponges
• Are called FILTER FEEDERS because
they take in dirty water and excrete
clean water
• Use hairs called FLAGELLA to keep
water moving through the sponge
Sponge Reproduction
• Asexual: use budding to grow an
exact clone on their body
• Asexual: use regeneration to grow
back body parts
• Sexual: use egg and sperm which
combine to form larva
Sessile
• An organism that stays attached to
one spot its entire life.
Flowers of the sea?
CNIDARIAN
• Jellyfish, Sea
anemone, coral,
hydra
• Sketch and
label with
tentacle and
mouth
Heniochus acuminatus
eating jellyfish
Sea anemone eating a
jellyfish
This turtle thought the plastic
bag was a jellyfish… he will
probably die
Jellyfish
• Catch prey with stinging tentacles
• Sexually : use sperm and egg which
combine to form larva
Jellyfish life cycle
• Sketch, label tentacles, top opening
Hydra
Hydra
• Catch prey
with tentacle
Hydra
• Reproduce asexually by budding
• Describe: baby grows on parent,
drops off
Invertebrates are not plants
b/c
• They eat for energy
• Do not have chlorophyll
Radial Symmetry
Body parts the same around a central
point
Bilateral symmetry
• Body parts same on 2 sides of a line
Asymmetry
• No line of symmetry
Page 357
Flatworms
• Bodies are soft
• Examples are planaria and tapeworm
• Most are parasites, which lives on a
host and harms it
Planaria
• Body: flat, triangular
head
• Eat dead meat and
plants
• Live in fresh water
• Move with cilia
• Reproduce by splitting
in two
• Hermaphrodite: both
male and female in the
same body
Tapeworms
• Attach to host with hooks or suckers
• Gets digested food from host
Roundworms
• Found in soil, animals, plants, fresh
water, and salt water (everywhere!!!!)
• Humans catch them by walking
barefoot through contaminated
fields
Roundworm mouthparts
Tick into skin, acting as a vector
Very graphic picture coming up
Guinea worm
Dracunculiasis
Pinworm
Trichinella
• can be prevented by cooking meat
thoroughly
• There is no cure
Dogs get heartworm
• by mosquito bites
• We call the mosquito a vector
Lumbricus terretrius
Anterior
• Above the waist
Posterior
• Below the waist
Dorsal
• On the back side
Ventral
• Belly side
• Setae
• 4 pr/segment…Bristles for movement
• (no skeletal system)
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• Mucous
• Keep skin wet for respiration…No lungs
• (no respiratory system)
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• Segments
• Movement… Holds organs in place
• Muscular system
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4a) Brain
4b) nerve cord
Color same color
Senses…Sends signals to organs
Nervous system
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• Mouth
• Ingestion
• Digestive system
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• Pharynx
• Swallowing
• Digestive system
• Crop
• Stores food
• Digestive system
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• Gizzards
• Grinds food
• Digestive system
#9
• Intestine
• Digests and absorbs food into circ
system
• Digestive system
#10
• Anus
• Excretes castings (good fertilizer)
• Digestive system
#11
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Aortic arches or hearts
Color reddish
Pumps blood
Circulatory system
#12
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Dorsal and ventral blood vessel
Color reddish
Takes blood to rest of body
Circulatory system
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Nephridia
#13
2 per segment
Filters liquid waste, excretes it thru skin
Excretory system
Worm Grunting
• To get worms to the surface, act like a mole
• Click here
• Why does it work?
• Click here