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Автор: Jesse Russel
Год: 2012
Издание:
Книга по Требованию
Страниц: 68
ISBN: 9785510584066
High Quality Content by WIKIPEDIA articles! The Ctenophora ( /t??n?f?r?/; singular ctenophore, /?t?n?f??r/ or /?ti?n?f??r/; from the Greek ????? kteis 'comb' and ???? phero 'carry'; commonly known as comb jellies) are a phylum of animals that live in marine waters worldwide. Their most distinctive feature is the "combs", groups of cilia that they use for swimming, and they are the largest animals that swim by means of cilia – adults of various species range from a few millimeters to 1.5 meters (59 in) in size. Like cnidarians, their bodies consist of a mass of jelly with one layer of cells on the outside and another lining the internal cavity. In ctenophores these layers are two cells deep while those in cnidarians are only one cell deep. Ctenophores also resemble cnidarians in having a decentralized nerve net rather than a brain. Some authors combined ctenophores and cnidarians in one phylum, Coelenterata, as both groups rely on water flow through the body cavity for both digestion...
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