Definitions
from The Century Dictionary.
- All those animals which are above the Protozoa, and which in the course of their development undergo certain metamorphoses, consisting of the primary segmentation of a true egg or ovum, and the subsequent passage through an embryonic condition in which they possess at least two distinct germinal layers: animals exhibiting cellular differentiation.
from the GNU version of the Collaborative International Dictionary of English.
- noun plural (Zoöl.) 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 andendoderm . The group comprises nearly all animals except the Protozoa.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun A taxonomic
subkingdom within thekingdom Animalia — themetazoa .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun multicellular animals having cells differentiated into tissues and organs and usually a digestive cavity and nervous system
Etymologies
Sorry, no etymologies found.
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Examples
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You didn't answer this question, but said that molecular homology does indicate vertical descent (common ancestry from an actual cell) in Metazoa, “the group located above the Darwinian threshold.”
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"Planula" theory, according to which the ancestral form of the Metazoa was a two-layered closed sac formed typically by delamination, less often by invagination.
Form and Function A Contribution to the History of Animal Morphology
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The album, "Metazoa," was recorded with and produced by Billy Anderson (NEUROSIS, MELVINS, SLEEP, PRIMORDIAL), mixed by Anderson, and mastered by Justin Weis (HAMMERS OF MISFORTUNE, LUDICRA, SLOUGH FEG).
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Current revision as of 06: 20, 8 February 2010 taxonomic Kingdom Animalia (also called Metazoa heterotrophs (i.e. they rely directly or indirectly on other organisms for their nourishment).
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Current revision as of 06: 20, 8 February 2010 taxonomic Kingdom Animalia (also called Metazoa heterotrophs (i.e. they rely directly or indirectly on other organisms for their nourishment).
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Of course, above the level of the domains, Woese's thinking is (more or less) conventional evolution — the vertical descent of familiar monophyletic groups (the eukaryotes, the Metazoa, etc).
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We can repeat the exercise if you like for Metazoa, Chordata, etc.
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You then cited publications where Woese, Doolittle, and others, affirm their faith in the monophyly of Eukarya, Metazoa, chimps and humans, whatever.
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Of course, above the level of the domains, Woese's thinking is (more or less) conventional evolution — the vertical descent of familiar monophyletic groups (the eukaryotes, the Metazoa, etc).
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I then would run my ancestry lines from Chordata (3) down to Metazoa (2) and from Metazoa to the ground line (1).
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