Invertebrates Flashcards
(23 cards)
vertebrates
an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes
Invertebrates
an animal that does not have a backbone
Consumer
a mass of nerve cells
Ganglion
the digestive tract
Gut
a body cavity that contains the internal organs
Coelom
the body cavity in metazoans, located between the intestinal canal and the body wall
Bilateral Symmetry
the property of being divisible into symmetrical halves on either side of a unique plane
Radial Symmetry
symmetry around a central axis, as in a starfish
Asymmetry
lack of equality or equivalence between parts or aspects of something
Sponges
he members of the phylum Porifera
Cnidarians
an aquatic invertebrate animal of the phylum Cnidaria
Flatworms
phylum of relatively simple soft-bodied invertebrate animals
Roundworms
roundworms constitute the phylum Nematode
Mollusks
an invertebrate of a large phylum which includes snails, slugs, mussels, and octopuses
Open circulatory system
a circulatory system in which the circuity fluid is not contained entirely in the vessels
Closed circulatory system
have the blood closed at all times within vessels of different size and wall thickness
Annelid worms
also known as the ringed worms or segmented worms
Exoskeleton
a rigid external covering for the body in some invertebrate animals, especially arthropods, providing both 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
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 network of water vessels in the body, the tube feet being operated by hydraulic pressure within the vessels
