invertebrates Flashcards
an animal of a large group distinguished by the possession of a backbone or spinal column.
vertebrates
an animal that does not have a backbone
invertebrates
a person or something that eats something
consumer
a mass of nerve cells
ganglion
the digestive tract
gut
a body cavity that contains the internal organs
coelom
arrangement of an organism or part of an organism along a central axis, so that the organism or part can be divided into two equal halves.
bilateral symmetry
arrangement of parts of an organism around a single main axis, so that the organism can be divided into similar halves by any plane that contains the main axis.
radial symmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry.
asymmetry
a primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers or calcareous or glassy spicules.
sponge
an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates
cnidarians
a phylum that includes the planarians together with the parasitic flukes and tapeworms. They are distinguished by having a simple flattened body
flatworm
a nematode, especially a parasitic one found in the intestines of mammals.
roundworm
an invertebrate of a large phylum that includes snails, slugs, mussels, and octopuses.
mollusks
pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells.
open circulatory system
all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities.
closed circulatory system
also known as the ringed worms or segmented worms, are a large phylum
annelid worms
a portion cut off from a geometric figure by one or more points, lines, or planes: asa
segment
a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both support and protection.
exoskeleton
an eye consisting of an array of numerous small visual units, as found in insects and crustaceans.
compound eye
a conductor by which electromagnetic waves are sent out or received
antenna
includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog.
metamorphosis
an internal skeleton, such as the bony or cartilaginous skeleton of vertebrates.
endoskeleton
a network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels.
water vascular system
