channel
channel 1. The preferred linear route along which surface water and
groundwater flow is usually concentrated (although water can flow across wide, flat surfaces as sheet flow). It is commonly a linear, concave-based depression (e.g. river channel, submarine fan channel). The geometry may be sinuous, anastomosing, or straight, and with a widely variable width-to-depth ratio. See
BRAIDED STREAM; and
MEANDER.
2. A narrow seaway connecting two wider bodies of water (e.g. the English Channel).
3. In remote sensing, the range of wavelengths recorded by a single detector to form an image.
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Nemertinea
Book article from: The Columbia Encyclopedia, Sixth Edition
Nemertinea , phylum of elongated, often flattened, marine Worms , sometimes called...grooves are believed to have a chemoreceptive or endocrine function. Nemertinea is the most primitive phylum that has developed a closed circulatory system...
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Nemertini
Book article from: A Dictionary of Zoology
Nemertini ( Rhyncocoela , Nemertea , Nemertinea , proboscis worms , ribbon worms ) A phylum of unsegmented, nonparasitic worms which are bilaterally symmetrical and elongate...
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ribbon worm
Book article from: The Columbia Encyclopedia, Sixth Edition
ribbon worm see Nemertinea .
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worm
Book article from: The Columbia Encyclopedia, Sixth Edition
...well as the parasitic flukes (class Trematoda) and tapeworms (class Cestoda). The nemertines, or ribbon worms (phylum Nemertinea ), are often colorful marine carnivores with an extensible proboscis. The smallest species are only a fraction of an inch...
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