Phyla

phyla: related classes grouped together (singular, phylum).
physical map: a map that locates a gene of interest precisely by showing the actual number of base pairs between genes on a chromosome.
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Simphyla A class of arthropods whose members are characterized by having long antennae, 10 to 12 pairs of legs, and centipedelike bodies. Occupy soil and leaf mold.
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The phyla arthropoda and mollusca both have exoskeletons. Since exoskeletons necessarily limit growth, phyla with exoskeletons have come up with various solutions.
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Phylum, Phyla (pl.): One of the major divisions of the animal kingdom.
Physical Control: Control of pests by physical means such as heat, cold, sound waves, etc.
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phylum pl. phyla
[Gk. phylon, race, tribe]
A taxonomic category; phyla are divided into classes.
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These three phyla are grouped in a clade — the alveolates — because
they all have a system of saclike structures ("alveoli") on the inner surface of their plasma membrane as well as
close homology in their gene sequences.
Ciliates ...
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The other platyzoan phyla are microscopic and pseudocoelomate. The most prominent are the Rotifera or rotifers, which are common in aqueous environments.
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All major animal phyla, save the Bryozoans, have their first appearance during the Cambrian. One of the dominant animal groups that appeared was the trilobites.
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The idea that the origin of higher taxa, such as genera (canines versus felines, for example), requires something special is based on the misunderstanding of the way in which new phyla (lineages) arise.
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He then grouped genera into families, families into orders, orders into classes, classes into phyla, and phyla into kingdoms. Linn identified two kingdoms: Animalia (animals) and Plantae (plants).
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[plural = phyla].
Class: a higher taxon consisting of one or more orders and distinct from other taxa of similar rank
Order: a higher taxon consisting of one or more families and distinct from other taxa of similar rank.
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Lynn Margulis, Five Kingdoms: An Illustrated Guide to the Phyla of Life on Earth, 3rd ed., St. Martin's Press, 1997, paperback, ISBN 0805072527 (many other editions) ...
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one of the main groups into which the animal and plant kingdoms are divided; plural, phyla
Source: Noland, George B. 1983. General Biology, 11th Edition. St. Louis, MO. C. V. Mosby
...
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ectoderm
The outermost of the three primary germ layers in animal embryos; gives rise to the outer covering and, in some phyla, to the nervous system, inner ear, and lens of the eye.
Lab 11 Animal Diversity I
Lab 14 Gametogenesis and Development ...
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phylum -- n. A category in the hierarchy of animal classification between class and kingdom; phyla- pl.
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A group of Metazoans that exhibit indeterminate, radial cleavage and that develop a mouth independent of, and at some distance from, the blastopore. (Echinoderms and Chordates and related minor phyla).
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The first period in the Palaeozoic era marked by the occurrence of many forms of invertebrate life (540-500
Mya
).
The sudden appearance of the major animal phyla in the fossil record during the Cambrian period is called Cambrian explosion.
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tend to share certain embryological traits; among these the formation of the "mouth first" (hence the name) during gastrulation, before the future anus. (The site of gastrulation initiation, the blastopore, becomes the mouth.) Major protostome phyla ...
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