Transcript Chapter 11 - BELIfeScience7

Complex Invertebrates
Arthropods and Echinoderms
15-3 Arthropods
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Arthropods
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More than a million
have been
identified
Main competition
for food
Insects,
Crustaceans,
spiders, and
scorpions
15-3 Arthropods
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3 Main
Characteristics
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Exoskeleton
 Rigid covering
 Does not grow
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Must be shed
(molting)
15-3 Arthropods
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3 Main
Characteristics
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Segmented body
Jointed
appendages
15-3 Arthropods
Open Circulatory system
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Blood is not
contained in tubes
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From heart
through open
spaces in body
Blood carried food
but not oxygen
Reproduce sexually
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Stay males and
females
15-3 Arthropods
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Crustaceans
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Crabs
Lobsters
Barnacles
Shrimp
15-3 Arthropods
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Crustaceans
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Body divided into
segments
 A pair of
appendages is
attached to each
segment
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Claws, legs, or
antennae
Can regenerate
certain body parts
15-3 Arthropods
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Crustaceans
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Most live in watery environments
Breath through gills
15-3 Arthropods
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Centipedes
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Have one pair of
legs in each
segment of their
body
Have claws that
inject venom
 Carnivores
Live in moist
environments
15-3 Arthropods
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Millipedes
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Have 2 pairs of
legs for each
segment of their
body
Herbivores
Roll up in ball when
in danger
Live under logs and
rocks
15-3 Arthropods
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Arachnids
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Body divided into 2
parts
 Head and
abdomen
4 pairs of legs
 Are attached to
their head
15-3 Arthropods
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Spiders
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Feed on insects or
small vertebrates
Webs
 Made of silk
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Secreted by
structures in
abdomen
Most are remade
every day
15-3 Arthropods
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Funnel Web
15-3 Arthropods
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Trapdoor Web
15-3 Arthropods
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Spiders
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Injects venom in
prey through fangs
 Either kills or
paralyzes prey
 Preserves living
creatures
15-3 Arthropods
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Spiders
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Have book lungs
 Has several
sheets of tissue
 As oxygen
passes over
sheets it is
removed
15-3 Arthropods
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Scorpions
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Have large stingers
Hold prey with
claws
Live under rocks
and logs
Nocturnal
15-3 Arthropods
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Ticks and Mites
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Live on other
organisms
Live off body fluids
 Juices of plants
 Blood of animals
15-3 Arthropods
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Insect Structure
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3 Parts
 Head
 Chest (Thorax)
 Abdomen
Has 3 pairs of legs
attached to the
chest
15-3 Arthropods
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Insect Structure
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Many eyes
 Compound eyes
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Contain many
lenses
Detect
movement
Simple eyes
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Detect light and
dark
15-3 Arthropods
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Insect Structure
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Most have wings
 Can have many
pairs
Has series of tubes
for carrying oxygen
Reproduce sexually
15-3 Arthropods
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Growth and
Development
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Grow rapidly
 Must shed
exoskeleton
Metamorphosis
 When an insect
changes their
appearance
during
development
15-3 Arthropods
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Metamorphosis
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Complete
 4 stage process
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Egg
Larva
 Spends
most of the
time eating
Pupa
 Usually
covered in
cocoon or
chrysalis
Adult
15-3 Arthropods
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Metamorphosis
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Incomplete
 Egg
 Young
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Nymphs
Looks like adult
but doesn’t
have all
characteristics
Adult
15-3 Arthropods
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Insect Behavior
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Most live solitary
lives
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Do not directly
compete for
available food
Males must attract
females
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Buzzing
Colors/lights
Pheromones
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Chemicals that
attract opposite
sex
5-3 Arthropods
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Insect Behavior
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Social insects
 Can not survive
on their own
 Form colonies or
hives
 Individuals
perform specific
jobs
15-3 Arthropods
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Defense
Mechanisms
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Mimics
 Look like
surroundings
 Look like a
predator
Weapons
 Stingers
 Bite
 Venom
15-3 Arthropods
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Syrphid Fly
15-3 Arthropods
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Walking Stick
15-3 Arthropods
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Viceroy Butterfly
15-3 Arthropods
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Owl Butterfly
15-4 Echinoderms: The “SpinySkinned” Animals
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Echinoderms
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Spiny skin
Internal skeleton
 Bone like plates
 Made of calcium
5 part body
15-4 Echinoderms: The “SpinySkinned” Animals
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Echinoderms
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Water vascular
system
 Fluid-filled
internal tubes
that…
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carry food and
oxygen
Remove waste
Help with
movement
15-4 Echinoderms: The “SpinySkinned” Animals
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Echinoderms
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Tube feet
 Suction-cuplike
 Use to walk
 Use to open
shells and catch
food
15-4 Echinoderms: The “SpinySkinned” Animals
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Starfish
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Have 5 or more
arms extending
from a central body
Have hundreds of
tube feet
 Used to open
clams
Regenerate
15-4 Echinoderms: The “SpinySkinned” Animals
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Sea Lilies
15-4 Echinoderms: The “SpinySkinned” Animals
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Feather Star
15-4 Echinoderms: The “SpinySkinned” Animals
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Sea Cucumber
15-4 Echinoderms: The “SpinySkinned” Animals
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Sea Urchins
15-4 Echinoderms: The “SpinySkinned” Animals
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Sand Dollar