invertebrate animal Flashcards
vertebrate
an animal that has a backbone
invertebrate
an animal without a backbone
consumer
an organism that eats other organisms or organic matter.
ganglion
a mass of nerve cells
gut
the digestive tract
coelom
a body cavity that contains the internal organs
bilateral symmetry
one side of the body is a mirror image of the opposite side (like ants)
radial symmetry
the body is organized around the center, like the spokes of a wheel
asymmetry
organism whose body is not organized around the center; body cannot be divided into two or more equal parts
sponges
simplest invertebrates, asymmetrical with no tissues, guts, or neurons, cannot make their own food
cnidarians
aquatic invertebrates that have stinging cells (hydrozoans, jellyfish, and sea anemones/corals)
flatworms
simplest type of worms (planarians and marine flatworms, flukes, and tape worms)
roundworms
worm, especially a parasitic one, found in the intestines of mammals (hookworms and pinworms) bodies are long, slim, and round
mollusks
snails and slugs (gastropods), clams and oysters (bivalves-2 shells), squids and octopuses (cepholapods)
Open circulatory system
where pumps blood into a cavity called a hemocoel where it surrounds the organs and then returns to the heart(s) through ostia (openings).
