Invertebrate Flashcards
Vertebrates
an animal of a large group distinguished by the possession of a backbone
an animal lacking a backbone
Invertebrates
Consumer
a person or thing that eats or uses something.
a structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber.
Ganglion
Gut
the stomach or belly.
the body cavity in metazoans, located between the intestinal canal and the body wall.
Coelom
Bilateral Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane.
symmetry around a central axis, as in a starfish or a tulip flower.
Radial Symmetry
Asymmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry.
a primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers or calcareous or glassy spicules. Sponges draw in a current of water to extract nutrients and oxygen.
Sponges
Cnidarians
an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates.
a worm of a phylum that includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body that lacks blood vessels, and a digestive tract that, if present, has a single opening.
Flatworms
Roundworms
a nematode, especially a parasitic one found in the intestines of mammals.
an invertebrate of a large phylum that includes snails, slugs, mussels, and octopuses. They have a soft, unsegmented body and live in aquatic or damp habitats, and most kinds have an external calcareous shell.
Mollusks
Open circulatory system
pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood.
