Body Symmetry
Animals with this type of symmetry can be divided into two equal halves that are mirror images.
What is bilateral symmetry?
The outer skeleton found in many invertebrates, including insects and crustaceans.
What is an exoskeleton?
The four stages of complete metamorphosis, in order.
What are egg, larva, pupa, and adult?
A soft-bodied invertebrate, like a snail or octopus, belongs to this group.
What are mollusks?
This is the percentage of animal species that are invertebrates.
What is about 95%?
Starfish have this type of symmetry, where body parts are arranged around a central point.
What is radial symmetry?
These bristle-like structures help earthworms move through soil.
What are setae?
The life cycle of grasshoppers involves only three stages. This is called what kind of metamorphosis?
What is incomplete metamorphosis?
Invertebrates with jointed legs, segmented bodies, and exoskeletons are in this group.
What are arthropods?
The body structure of most mollusks includes a foot, a visceral mass, and this outer layer.
What is the mantle?
Some sponges have this type of symmetry, or lack any regular pattern at all.
What is asymmetry?
Insects breathe through tiny holes in their body called these.
What are spiracles?
During the pupa stage, this process occurs to prepare an insect for adulthood.
What is transformation (or reorganization)?
Starfish and sea urchins are part of this spiny-skinned invertebrate group.
What are echinoderms?
Coral reefs are formed by colonies of these tiny invertebrates.
What are polyps (or coral polyps)?
This type of symmetry is common in animals that are active movers with distinct head and tail ends.
What is bilateral symmetry?
Octopuses and squids have these special arm-like structures with suckers.
What are tentacles?
A caterpillar is in this stage of complete metamorphosis.
What is the larva stage?
Insects are part of this largest invertebrate group.
What are arthropods?
The name for the process crabs and insects use to shed their exoskeleton as they grow.
What is molting?
An advantage of radial symmetry for invertebrates like sea stars.
What is sensing the environment from all directions?
Arachnids have this many body segments.
What are two body segments?
This is why incomplete metamorphosis is considered "simpler" than complete metamorphosis.
What is the lack of a pupa stage?
Jellyfish, corals, and sea anemones belong to this group with stinging cells.
What are cnidarians?
The earthworm’s digestive system includes this structure, which grinds food.
What is the gizzard?