Invertebrate Animal Flashcards
(23 cards)
an animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes.
Vertebrates
an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 percent of animal species and about 30 different phyla.
Invertebrates
a person or thing that eats or uses something.
Consumer
Brain and Nervous System. The cerebral ganglion, located at the front of the worm, serves as the brain. This nerve bundle is responsible for receiving external information such as light, heat, moisture, and vibrations
Ganglion
the stomach or belly.
Gut
the body cavity in metazoans, located between the intestinal canal and the body wall.
Coelom
the property of being divisible into symmetrical halves on either side of a unique plane.
Bilateral Symmetry
symmetry around a central axis, as in a starfish or a tulip flower.
Radial Symmetry
lack of equality or equivalence between parts or aspects of something; lack of symmetry.
Asymmetry
the members of the phylum Porifera, are a basal Metazoa clade as a sister of the Diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate through them, consisting of jelly-like mesohyl sandwiched between two thin layers of cells
Sponges
an aquatic invertebrate animal of the phylum Cnidaria, which comprises the coelenterates.
Cnidarians
a phylum of relatively simple soft-bodied invertebrate animals. With about 25,000 known species they are the largest phylum of acoelomates. are found in marine, freshwater, and even damp terrestrial environments. Most are free-living forms, but many are parasitic on other animals.
Flatworms
The nematodes or constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments.
Roundworms
an invertebrate of a large phylum which 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 systems (evolved in crustaceans, insects, mollusks and other invertebrates) 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.
Open circulatory system
Vertebrates, and a few invertebrates, have a closed circulatory system. Closed circulatory systems have the blood closed at 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
The annelids, also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches
Annelid worms
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
either of a pair of long, thin sensory appendages on the heads of insects, crustaceans, and some other arthropods
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
