Download Chapter 17 – Invertebrates Vocabulary Invertebrate – an animal that

Chapter 17 – Invertebrates Vocabulary
Invertebrate – an animal that does not have a backbone.
Symmetry – arrangement of individual body parts; can be radial or bilateral.
Polyp – vase shaped body of a cnidarians that is attached to the ground.
Medusa – bell shaped body of a cnidarians that can swim or move.
Mantle – thin layer of tissue that covers a mollusk’s body and that can secrete a shell.
Radula – scratchy, tonguelike organ in many mollusks that has rows of teethlike projects used to scrape and
grate food.
Closed Circulatory System – a type of blood circulation system in which blood is transported through blood
vessels rather than washing over organs.
Open Circulatory System – a type of blood circulation system that lacks blood vessels and in which blood
washes over the organs.
Appendage – structure such as a claw, leg, or antenna that grows from the body.
Exoskeleton – rigid, protective body covering of an arthropod that supports the body and reduces water loss.
Metamorphosis – a change in body form that can be complete or incomplete.