Download 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
34.2
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.