Chapter 15 Invertebrates

An animal without a backbone Click for Term

Invertebrate An animal without a backbone Click for Term

A body plan in which two halves of an organism’s body are mirror images of each other Click for Term

Bilateral symmetry A body plan in which two halves of an organism’s body are mirror images of each other Click for Term

A body plan in which the parts of a body are arranged in a circle around a central point Click for Term

Radial symmetry A body plan in which the parts of a body are arranged in a circle around a central point Click for Term

Without symmetry Click for Term

Asymmetrical Without symmetry Click for Term

Group of nerve cells Click for Term

Ganglia Group of nerve cells Click for Term

The pouch where food is digested in animals Click for Term

Gut The pouch where food is digested in animals Click for Term

A cavity in the body of some animals where the gut and organs are located Click for Term

Coelom A cavity in the body of some animals where the gut and organs are located Click for Term

A circulatory system consisting of a heart that pumps blood through spaces called sinuses Click for Term

Open circulatory system A circulatory system consisting of a heart that pumps blood through spaces called sinuses Click for Term

A circulatory system in which a heart circulates blood through a network of vessels that forms a closed loop Click for Term

Closed circulatory system A circulatory system in which a heart circulates blood through a network of vessels that forms a closed loop Click for Term

One of many identical or almost identical repeating body parts Click for Term

Segment One of many identical or almost identical repeating body parts Click for Term

An external skeleton made of protein and chitin found in arthropods Click for Term

Exoskeleton An external skeleton made of protein and chitin found in arthropods Click for Term

An eye that is made of many identical units, or eyes, that work together Click for Term

Compound eye An eye that is made of many identical units, or eyes, that work together Click for Term

Feelers on an arthropod’s head that respond to touch or taste Click for Term

Antennae Feelers on an arthropod’s head that respond to touch or taste Click for Term

A jaw found on some arthropods Click for Term

Mandible A jaw found on some arthropods Click for Term

A process in which an insect or other animal changes form as it develops from an embryo or larva to an adult Click for Term

Metamorphosis A process in which an insect or other animal changes form as it develops from an embryo or larva to an adult Click for Term

An internal skeleton Click for Term

Endoskeleton An internal skeleton Click for Term

A system of water pumps and canals found in all echinoderms that allows them to move, eat, and breathe Click for Term

Water Vascular System A system of water pumps and canals found in all echinoderms that allows them to move, eat, and breathe Click for Term