invertebrate animals Flashcards
an animal that has a backbone
vertebrates
an animal that does not have a backbone
invertebrates
an organism that eats other organisms or organic matter
consumer
a mass of nerve cells
ganglion
the digestive tract
gut
a body cavity that contains the internal organs
coelom
the 2 sides of its body mirror each other on each side of its body the ant has one eye one antenna and three legs
bilateral symmetry
its body is organized around the center like spokes on a wheel
radical symmetry
you can not draw a straight line to divide its body into two or more equal parts its body is not organized around a center
asymmetry
they are the simplest invertebrates they have no tissues guts or neurons adult sponges move only millimeters a day if they move at all
sponges
have complex tissues and a gut for digesting food they have simple network of nerve cells they move more quickly than sponges can if the body cells are separated they can come back together
cnidarians
they are divided into 3 major classes planarians and marine flatworms flukes and tapeworms
flatworms
have bodies that are long slim and round like spaghetti they have bilateral symmetry they have a simple nervous system
roundworms
they fit into 3 classes the gastropods includes slugs ans snails the bivales include clams and other shellfish that have 2 shells cephalopods includes squids and octopuses
mollusks
a circulatory system in which the circulatory fluid is not contained entirely within vessels
open circulatory system
