Invertebrate Animal Flashcards
Vertebrates
an animal that has a backbone
Invertebrates
an animal that does not have 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
the property of being divisible into symmetrical halves on either side of a unique plane
Radical Symmetry
symmetry around a central axis, as in a starfish or a tulip flower
Asymmetry
lack of equality between parts or aspects of something; lack of symmetry
Sponge
a primitive sedentary aquatic invertebrate with a soft porous body that draw in a current of water to extract nutrients and oxygen
Cnidarians
an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates
Flatworms
a worm of a phylum that includes the planarians together with the parasitic flukes and tapeworms
Roundworms
a nematode, especially a parasitic one found in the intestines of mammals
Mollusks
an invertebrate of a large phylum that includes snails, slugs, mussels, and octopuses
Open circulatory system
pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells
Closed circulatory system
have the blood closed at all times within vessels of different size and wall thickness
Annelid worms
any of various worms or wormlike animals of the phylum Annelida characterized by an elongated, cylindrical body divided into ringlike segments
Exoskeleton
a rigid external covering for the body in some invertebrate animals, providing support and protection
Compound eye
an eye consisting of an array of numerous small visual units, as found in insects and crustaceans
Antenna
either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods
Metamorphosis
(in an insect or amphibian) the process of transformation from an immature form to an adult form in two or more distinct stages
Endoskeleton
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates
Water vascular system
a system of canals in echinoderms containing a circulating watery fluid that is used for the movement of the tentacles and tube feet
