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).
Closed circulatory system
heart circulates the blood through blood vessels in a closed loop (blood doesn’t leave blood vessels)
Annelid worms
also known as segmented worms, they have bilateral symmetry, a closed circulatory system, and a complex nervous system (each segment contains ganglion that is connected to to the brain by a nerve cord). Earthworms, marine worms, and leeches
Exoskeleton
a hard, external, supporting structure to hold up the body
Compound eye
eye made of many light detectors, and allows the ability to see images, found in arthropods such as insects and crustaceans.
Antenna
a feeler that is on the head of an invertebrate, such as a crustacean or an insect, which senses touch, taste, or smell
Metamorphosis
life cycle phase during which a rapid change from immature form to adult form takes place (insects- notably butterflies)
Endoskeleton
an internal skeleton made of bones and cartilage
Water vascular system
a system of canals filled with a watery fluid that circulates throughout the body of an echinoderm
