Transcript Invertebrates

Characteristic Of
Animals
Most are Motile
No Cell Walls
Heterotrophic
Multicellular
Eukaryotic
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What must animal do in order to 4
survive?
• Feeding- Energy
• Respiration- Exchange gases
• Circulation- move materials around the
body
• Excretion- get rid of waste
• Response- react to external stimuli.
• Movement- Move from place to place.
• Reproduction- create new organisms.
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Phyla of invertebrates include
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1. Porifera
2. Cnidarian
3. Flatworms
4. Roundworms
5. Segmented worms
6. Mollusks
7. Arthropods
8. Echinoderms
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Medusa
Polyp
Immobilize
and kill prey
with stinging
cells on
tentacles
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Body Plan
Radial
Symmetry
Have
tissues
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•Soft, Flattened
•Have tissues and internal organs
•Have a simple nervous system.
•Bilaterally symmetrical
•Gas exchange through skin.
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Cool Fact! They can regenerate missing parts
and even grow a new planaria from a piece of
one!
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Roundworms, hookworms
free-living and parasitic
aquatic and terrestrial
Digestive system with two openings
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Body
•Unsegmented
•Digestive system with two openings
•Exchange gases through body wallsthrough diffusion
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Diseases caused by roundworms:
Trichinosis
•In humans, can be contracted by eating infected pork.
•5% of cases are fatal
Ascarid Worm:
•Matures in the intestines of the host
•Eating vegetables that are not washed
Hookworms
•Soil
•Walking barefoot
•anemia, malnutrition, and in children causes under-development
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Segmented, Bilateral symmetry
Two way gut
-Feed by sucking in soil and decaying
matter
Closed system-blood vessels
Ex: Earthworms,
leeches
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Ecology:
•Recycling in nature
•Diet of many birds
•Diet of fish
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Latin mollus: “soft”
Examples: snails, slugs, clams, squids, and octopi.
2nd Largest animal phylum on Earth
• Almost all habitats
• Soft-bodied animals, usually with a hard external shell.
• Some have lost the shell completely.
• Have internal organs
• Shells are made of calcium carbonate
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Feeding:
Can be herbivores,
carnivores, filter
feeders, detritivores,
or parasites.
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Spiders, insects, centipedes,
scorpions, shrimp, crabs,
lobsters, butterflies
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Major Characteristics:
•Segmented bodies covered in an exoskeleton
of chitin (Carbohydrate).
•Jointed appendages
•Legs, antennae
•Three segments:
•Head, Thorax, Abdomen
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Exoskeleton
Protection
Helps prevent water loss
Provides framework for
muscle attachment
Does not grow. When
the organism outgrows it,
it molts.
•Metamorphosis (Insects)
Adult stage and larval stage
do not compete for food.
•Feeding: Can be herbivores,
carnivores, and omnivores.
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Circulation
•Open
circulatory
system
• Well
developed heart
with arteries
and vessels
Reproduction
•Internal fertilization land or
external Aquatic
34.1
Response
•Well
developed
nervous system
with brain
•Sensitive
organs such as
eyes and taste
receptors
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Clip
Arthropod Diversity!!
Clip
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UPS
DOWNS
•Termites destroy
wood
•Moths eat cloth
•Locusts destroy crops
•Cotton Boll Weevils
•Mosquitoes and
diseases
•Bees, butterflies, etc.,
pollinate crops
•Some produce silk, wax,
honey
•Food
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Termites
Insects and communication
Sounds- chirps, buzz
Light- Male fireflies
Chemicals- Pheromones
(mate, danger, or alert)
Insect Societies
•Complex group that works together for the
good of the colony.
•Different roles are preformed by groups
called castes.
•Each castes has a different body form to
carry out their specific task.
•Very sophisticated communication.
•Bees Dance!
•Ants leave pheromone
trails.
Carpenter ant castes, from
left to right: queen, winged
male, major worker, minor
worker
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“Spiny Skin”
~7,000 species
Sea stars, sand dollars, and sea urchins
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Major Characteristics
All are aquaticmarine
Spiny skin
Internal Skeleton
Move with tube
feet
“suction cup”
Sand dollars and
sea urchins have
moveable spines.
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Feeding:
•Various methods
Sea Star:
Pushes stomach out through its
mouth (which is on the underside)
into a clam and then digests.
Can regenerate missing parts
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•Ecology:
•Major food source for other marine animals
•Carnivorous echinoderms help control
populations of clams
•“Crown of Thorns” sea star destroys coral
reef systems.