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Definition of Metazoa
1. Noun. Multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system.
Group relationships: Animal Kingdom, Animalia, Kingdom Animalia
Member holonyms: Metazoan, Cnidaria, Coelenterata, Phylum Cnidaria, Phylum Coelenterata
Generic synonyms: Subkingdom
Definition of Metazoa
1. n. pl. Those animals in which the protoplasmic mass, constituting the egg, is converted into a multitude of cells, which are metamorphosed into the tissues of the body. A central cavity is commonly developed, and the cells around it are at first arranged in two layers, -- the ectoderm and endoderm. The group comprises nearly all animals except the Protozoa.
Definition of Metazoa
1. Noun. All those multicellular animals, of the subkingdom Metazoa, that have differentiated tissue. ¹
¹ Source: wiktionary.com
Definition of Metazoa
1. metazoon [n] - See also: metazoon
Medical Definition of Metazoa
1.
Lexicographical Neighbors of Metazoa
Literary usage of Metazoa
Below you will find example usage of this term as found in modern and/or classical literature:
1. College zoology by Robert William Hegner (1918)
"There are a considerable number of animals which are intermediate between the
PROTOZOA and the metazoa, but, on the whole, the two groups are fairly well ..."
2. Behavior of the Lower Organisms by Herbert Spencer Jennings (1906)
"The metazoa differ from the Protozoa structurally in the important facts that
their bodies are made of many cells and that they have a nervous system. ..."
3. Text-book of Comparative Anatomy by Arnold Lang, Ernst Heinrich Philipp August Haeckel (1891)
"IN contradistinction to Protista or Protozoa we have real Animals or metazoa.
The bodies of the former consist of one single cell or of several similar ..."
4. Lectures on the Comparative Pathology of Inflammation by Elie Metchnikoff (1893)
"IN passing to the animal kingdom, we have to confess that we are at present
ignorant of the way in which the multicellular animals or metazoa are derived ..."
5. A Text-book of Invertebrate Morphology by James Playfair McMurrich (1896)
"THE metazoa are equivalent to colonies of Protozoa, the individual cells of which
have ... In the metazoa the physiological differentiations of the ..."
6. An Introduction to Zoology by Robert William Hegner (1910)
"AN INTRODUCTION TO THE metazoa 1. CELLULAR DIFFERENTIATION — TISSUES . THERE is
no sharp line between the metazoa and Protozoa. We have seen (Chap. ..."
7. Contributions to the Study of the Behavior of Lower Organisms by Herbert Spencer Jennings (1904)
"Passing now to the metazoa, we find in the flatworm, Planaria, as described by
... The flatworm may be considered typical of the lower bilateral metazoa ..."
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