Invertebrate Animals

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Invertebrate Animals
Invertebrate animals have a variety of body plans
and adaptations.
4.1
Most animals are invertebrates.
4.2
Cnidarians and worms have different body plans.
Most mollusks have shells, and echinoderms have
spiny skeletons.
4.3
4.4
Arthropods have exoskeletons and joints.
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4.1
Most animals are invertebrates.
Invertebrates are a diverse group of animals.
Species of invertebrates live in almost every
environment.
invertebrate
sponge
sessile
larva
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Sponges are simple invertebrates that have
several types of specialized cells.
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invertebrate
4.1
Most animals are invertebrates.
invertebrate
sponge
An animal that has no backbone.
sessile
larva
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KEY CONCEPT SUMMARY
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sponge
4.1
Most animals are invertebrates.
invertebrate
sponge
A simple multicellular invertebrate animal that
lives attached to one place and filters food from
water.
sessile
larva
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sessile
4.1
Most animals are invertebrates.
invertebrate
sponge
The quality of being attached to one spot not
free-moving.
sessile
larva
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larva
4.1
Most animals are invertebrates.
invertebrate
sponge
A free-living early form of a developing organism
that is very different from its adult form.
sessile
larva
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KEY CONCEPT SUMMARY
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Cnidarians and worms have different body plans.
4.2
cnidarian
Cnidarians have simple bodies with specialized
cells and tissues.
Most worms have organs and complex body systems.
tentacle
mobile
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cnidarian
4.2
Cnidarians and worms have different body plans.
cnidarian
tentacle
An invertebrate animal such as a jellyfish that
has a body with radial symmetry, tentacles with
stinging cells, and a central internal cavity.
mobile
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KEY CONCEPT SUMMARY
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tentacle
4.2
Cnidarians and worms have different body plans.
cnidarian
tentacle
A long, slender, flexible extension of the body
of certain animals, such as jellyfish. Tentacles
are used to touch, move, or hold.
mobile
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KEY CONCEPT SUMMARY
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mobile
4.2
Cnidarians and worms have different body plans.
cnidarian
tentacle
Able to move from place to place.
mobile
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KEY CONCEPT SUMMARY
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Most mollusks have shells, and echinoderms have
spiny skeletons.
4.3
Mollusks include bivalves, gastropods, and
cephalopods.
Echinoderms have a water vascular system and tube
feet.
mollusk
gill
lung
echinoderm
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mollusk
4.3
Most mollusks have shells, and echinoderms have
spiny skeletons.
mollusk
gill
An invertebrate animal with a soft body, a
muscular foot, and a mantle. Many mollusks have a
hard outer shell.
lung
echinoderm
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KEY CONCEPT SUMMARY
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gill
4.3
Most mollusks have shells, and echinoderms have
spiny skeletons.
mollusk
gill
A respiratory organ that filters oxygen dissolved
in water.
lung
echinoderm
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lung
4.3
Most mollusks have shells, and echinoderms have
spiny skeletons.
mollusk
gill
A respiratory organ that absorbs oxygen from the
air.
lung
echinoderm
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echinoderm
4.3
Most mollusks have shells, and echinoderms have
spiny skeletons.
mollusk
gill
An invertebrate sea animal with a spiny skeleton,
a water vascular system, and tube feet.
lung
echinoderm
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Arthropods have exoskeletons and joints.
4.4
Arthropods, which include insects,
crustaceans,
and arachnids,
are the most abundant and diverse group of
animals.
arthropod
exoskeleton
molting
insect
metamorphosis
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arthropod
4.4
Arthropods have exoskeletons and joints.
arthropod
exoskeleton
An invertebrate animal with an exoskeleton, a
segmented body, and jointed legs.
molting
insect
metamorphosis
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KEY CONCEPT SUMMARY
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exoskeleton
4.4
Arthropods have exoskeletons and joints.
arthropod
exoskeleton
The strong, flexible outer covering of some
invertebrate animals, such as arthropods.
molting
insect
metamorphosis
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molting
4.4
Arthropods have exoskeletons and joints.
arthropod
exoskeleton
The process of an arthropod shedding its
exoskeleton to allow for growth.
molting
insect
metamorphosis
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insect
4.4
Arthropods have exoskeletons and joints.
arthropod
exoskeleton
An arthropod with three body segments, six legs,
two antennae, and compound eyes.
molting
insect
metamorphosis
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metamorphosis
4.4
Arthropods have exoskeletons and joints.
arthropod
exoskeleton
The transformation of an animal from its larval
form into its adult form.
molting
insect
metamorphosis
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KEY CONCEPT SUMMARY
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4.1
Most animals are invertebrates.
I. Most animals are invertebrates.
invertebrate
A. Invertebrates are a diverse group of
organisms.
sponge
B. Sponges are simple animals.
sessile
1. Specialized Cells
larva
2. Reproduction
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KEY CONCEPT SUMMARY
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Cnidarians and worms have different body plans.
4.2
II. Cnidarians and worms have different body
plans.
cnidarian
A. Cnidarians have simple body systems.
tentacle
1. Tissues and Body Systems
mobile
2. Reproduction
B. Animals have different body plans.
C. Most worms have complex body systems.
1. Segmented Worms
2. Flatworms and Roundworms
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KEY CONCEPT SUMMARY
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Most mollusks have shells, and echinoderms have
spiny skeletons.
4.3
III. Most mollusks have shells, and echinoderms
have spiny skeletons.
mollusk
gill
A. Mollusks are soft-bodied animals.
lung
1. Bivalves
2. Gastropods
echinoderm
3. Cephalopods
B. Mollusks show a range of adaptations.
C. Echinoderms have unusual adaptations.
1. Spines and Skeletons
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2. Water Vascular System and Tube Feet
KEY CONCEPT SUMMARY
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Arthropods have exoskeletons and joints.
4.4
IV. Arthropods have exoskeletons and joints.
arthropod
A. Most invertebrates are arthropods.
exoskeleton
1. Exoskeletons and Jointed Parts
molting
2. Complex Body Systems
insect
B. Insects are six-legged arthropods.
metamorphosis
C. Crustaceans live in water and on land.
D. Arachnids are eight-legged arthropods.
E. Millipedes and centipedes are arthropods.
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KEY CONCEPT SUMMARY
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