Lab 9: Animal Diversity Flashcards
Acoelomate
A solid-bodied animal lacking a cavity between the gut and outer body wall.
An animal that lacks a coelom. Acoelomates, which include the flatworm, fluke, tapeworm, and ribbon worm, exhibit bilateral symmetry and possess one internal space, the digestive cavity.
Bilateral Symmetry
Body symmetry in which a central longitudinal plane divides the body into two equal but opposite halves.
The 3 Domains
Bacteria, Archaea, and Eukaria
Eukarya The domain that includes all eukaryotic organisms.
The domain that includes all eukaryotic organisms.
Includes 4 Kingdoms: Plantae Animalia Fungi Protista
eukaryotic cell
A type of cell with a membrane-enclosed nucleus and membrane-enclosed organelles. Organisms with eukaryotic cells (protists, plants, fungi, and animals) are called eukaryotes.
No cell wall.
Protist
An informal term applied to any eukaryote that is not a plant, animal, or fungus. Most protists are unicellular, though some are colonial or multicellular.
Protista
a paraphyletic group (Pertaining to a group of taxa that consists of a common ancestor and some, but not all, of its descendants.)
Asymmetry
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cephalization
An evolutionary trend toward the concentration of sensory equipment at the anterior end of the body.
coelom
A body cavity lined by tissue derived only from mesoderm. Provides cushion and shock absorption.
coelomate
An animal that possesses a true coelom (a body cavity lined by tissue completely derived from mesoderm).
deuterostome development
In animals, a developmental mode distinguished by the development of the anus from the blastopore; often also characterized by radial cleavage and by the body cavity forming as outpockets of mesodermal tissue
exoskeleton
A hard encasement on the surface of an animal, such as the shell of a mollusc or the cuticle of an arthropod, that provides protection and points of attachment for muscles.
Multicellular
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Nonvascular
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protostome development
In animals, a developmental mode distinguished by the development of the mouth from the blastopore; often also characterized by spiral cleavage and by the body cavity forming when solid masses of mesoderm split.
pseudocoelomate
An animal whose body cavity is lined by tissue derived from mesoderm and endoderm.
an invertebrate (as a nematode or rotifer) having a body cavity that is a pseudocoel
radial symmetry
Symmetry in which the body is shaped like a pie or barrel (lacking a left side and a right side) and can be divided into mirror-imaged halves by any plane through its central axis.
