Invertebrate Animals Flashcards
(24 cards)
an animal with a backbone
vertebrate
an animal with no backbone
invertebrate
a person or thing that eats or uses something
consumer
a structure containing a number of nerve cell bodies
ganglion
the stomach or the belly
gut
the body cavity in metazoans
coelom
the property of being divisible into equal halves
bilateral symmetry
symmetry around a central axis
radial symmetry
lack of equality or equivalence between parts or aspects of something
asymmetry
a primitive sedentary aquatic invertebrate with a soft porous body that is typically supported by a framework of fibers
sponges
an aquatic invertebrate animal of the phylum
cnidarians
a worm of a phylum that includes the planarians together with the parasitic flukes and tapeworms
flatworms
a nematode, especially a parasitic one found in the intestines of mammals
roundworms
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
have the blood closed ata all times within vessels of different size and wall thickness
closed circulatory system
also known as the ringed worms or segmented worms, are a large phylum
annelid worms
each of the parts into which something is or may be divided
segment
a rigid external covering for the body
exoskeleton
an eye consisting of an array of numerous small visual units, as found in insects and crustaceans
compound eye
a pair of long, thin sensory appendages on the heads of insects
antenna
the process of transformation from an immature form to an adult form in two or more distinct stages
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
