| 单词 | hydroid |
| 例句 | Many hydrozoans form colonies that are composed of a branched colony of specialized polyps that share a gastrovascular cavity, such as in the colonial hydroid Obelia. Fundamentals of Biology 2015-01-01T00:00:00Z Willis and his colleagues found that nitrogen-15 levels in their nudibranchs were lower than they would expect if the animals were eating hydroids only. When this sea slug eats, it prefers ‘turducken of the ocean’ 2017-11-04T04:00:00Z The nudibranch, besides using the hydroids for habitat, regularly consume its home colony’s polyps. This sea slug has a trick for getting an extra treat 2017-10-31T04:00:00Z Cardinalfish zip by a loggerhead turtle as it rests among feathery invertebrates called hydroids. 2 Countries Reveal How Divided the World Is on Climate Change 2015-11-16T05:00:00Z “Finding really good hydroid experts is very difficult,” says James Carlton, a professor of marine sciences at Williams College and the director of the Williams-Mystic Maritime Studies Program. Can a Jellyfish Unlock the Secret of Immortality? 2012-11-28T23:26:58Z An example is the colonial hydroid called an Obelia. The sessile polyp form has, in fact, two types of polyps, shown in Figure 3. Fundamentals of Biology 2015-01-01T00:00:00Z This suggests that the slugs might be getting a significant amount of nutrition directly from small plankton, which contain lower quantities of nitrogen-15 than hydroids. When this sea slug eats, it prefers ‘turducken of the ocean’ 2017-11-04T04:00:00Z In certain hydroids, an imperfect zooid, whose special function is to produce medusoid buds. Webster's Unabridged Dictionary (2nd 100 Pages) 2012-03-24T02:00:19.387Z Zoophyte, zō′ō-fīt, n. a term employed by Cuvier in his earlier attempts at classification to designate numerous simple animals, sedentary in habit, often with a superficial resemblance to plants—now restricted to hydroid colonies.—adjs. Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) 2012-01-30T03:00:19.113Z There are significantly more crab experts, for instance, than hydroid experts. Can a Jellyfish Unlock the Secret of Immortality? 2012-11-28T23:26:58Z I know of no form in which so many of the characteristic features of a typical hydroid are more finely expressed than in this beautiful species.” On the Origin and Metamorphoses of Insects 2011-12-05T03:00:46.667Z These psychedelic slugs, also called nudibranchs, are known to feed on tentacled marine organisms known as hydroids, which are related to coral and sea anemones. When this sea slug eats, it prefers ‘turducken of the ocean’ 2017-11-04T04:00:00Z Long ago, Trembley attempted to cause, by grafting, the union of two pieces of hydroid polyps into a single individual. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z In the waters below and around the cape several specimens of algæ, medusa, hydroids, and other low forms of marine life were secured. The Romance of Polar Exploration Interesting Descriptions of Arctic and Antarctic Adventure from the Earliest Time to the Voyage of the ?Discovery? 2011-07-22T02:00:16.487Z In other hydroid species, the medusa dies after it spawns. Can a Jellyfish Unlock the Secret of Immortality? 2012-11-28T23:26:58Z The question of the geographical range of the sponges, hydroids, and polyzoa of brackish water may be considered briefly, for it is of importance in considering that of those which are confined to fresh water. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z They pop the polyps off the hydroids as one might pick a flower off a stalk. When this sea slug eats, it prefers ‘turducken of the ocean’ 2017-11-04T04:00:00Z He found, for instance, that, in the case of hydroids, the sexual cells did not arise in such a fashion. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z Note.—See in review the methods used to spread corals, hydroids, and other sedentary forms, starfish, clams, etc., as well as those used by the various vertebrates. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z But most hydroid experts find it nearly impossible to secure financing. Can a Jellyfish Unlock the Secret of Immortality? 2012-11-28T23:26:58Z In addition to these four species a minute hydroid belonging to the order Gymnoblastea and now being described by Mr. J. Ritchie has been taken in the ponds at Port Canning. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z Using statistical models, the researchers estimated that these plankton possibly contribute as much, or more, to these slugs’ diets as the hydroids themselves. When this sea slug eats, it prefers ‘turducken of the ocean’ 2017-11-04T04:00:00Z This new species is found only on nasty stinging hydroids that are the marine equivalent of habanero chiles. New Nudibranchs, and the Sting of Biodiversity 2010-05-24T20:36:00Z This gigantic creature grows from the small one, called a hydroid, represented in the small cut. Harper's Young People, November 18, 1879 An Illustrated Weekly But because there are so few hydroid experts, our understanding of these species is staggeringly incomplete. Can a Jellyfish Unlock the Secret of Immortality? 2012-11-28T23:26:58Z This animal, which has been found in N. America and in Germany, possesses both an asexual hydroid and a sexual medusoid generation. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z Much of the seaweed from deeper bottoms seems to be covered with a dense fur, which under a hand lens resolves into beautiful hydroids,—near relatives of the anemones and corals. The Log of the Sun A Chronicle of Nature's Year While we avoided the painful stings of the hydroid, we weren’t entirely lucky. New Nudibranchs, and the Sting of Biodiversity 2010-05-24T20:36:00Z You see the hydroid does not in the least resemble a jelly-fish. Harper's Young People, November 18, 1879 An Illustrated Weekly It may, as Dr. Haast supposes, be a ground feeder, existing on the smaller hydroid zoophytes, otherwise it must, I think, turn on its side in seizing its prey. Natural History of the Mammalia of India and Ceylon There is little to be said as regards the distribution of the sponges, hydroids, and polyzoa of fresh water in other parts of India. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z When these attain their full size they lay eggs which sink to the bottom and grow up into the plant-like hydroids. The Log of the Sun A Chronicle of Nature's Year It is usually present on Campanularian hydroids, but may be found on algæ and Bryozoa. Marine Protozoa from Woods Hole Bulletin of the United States Fish Commission 21:415-468, 1901 Innumerable algae and curious fungi of the sea, hydroids, delicate-frost formed emerald plumuluria and campanuluna, bryozoa, mollusks, barnacles and varieties of coral had used it as a builder's quarry and granary. Lippincott's Magazine of Popular Literature and Science Volume 12, No. 28, July, 1873 Also applied to the proboscis or manubrium of a hydroid medusa. The Gutenberg Webster's Unabridged Dictionary Section F, G and H Both hydroid and medus� were found in a small pool of brackish water at Port Canning. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z In other words, a hydroid is exactly like its grandmother and granddaughter, but as different from its parents and children in appearance as a plant is from an animal. The Log of the Sun A Chronicle of Nature's Year Great heavens," exclaimed Professor Abel Able, "it is a gigantic hydroid polyps! The Second Deluge Many "worms," crustaceans, pteropods, asteroids, gastropods and hydroids were obtained, and McLean and I had many interesting hours classifying the specimens. The Home of the Blizzard Being the Story of the Australasian Antarctic Expedition, 1911-1914 Two forms of zooids in life project from small pores in the coral and resemble those of other hydroids. The Gutenberg Webster's Unabridged Dictionary Section F, G and H The medusa was originally taken off the coast of Ceylon, while the hydroid was discovered in ponds of brackish water at Port Canning. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z Mr. Clark, one of my assistants, has made very good drawings of all its stages of growth, and of various other hydroid medusae peculiar to this coast. Louis Agassiz: His Life and Correspondence It is thus possible to force upon this hydroid an arrangement of organs which is altogether different from the hereditary arrangement. Darwin and Modern Science Only the medusa, which is found in Lake Tanganyika, Lake Victoria Nyanza and the R. Niger, has been found and it is doubtful whether a hydroid generation exists. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z They in turn produce the eggs from which the hydroids are developed. The Gutenberg Webster's Unabridged Dictionary Section F, G and H This is a branching hydroid that does not produce free medus�. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z The naturalists of the eighteenth century were acquainted with more than one species of freshwater polyzoon, but they did not distinguish these species from the hydroids. Freshwater Sponges, Hydroids & Polyzoa 2011-06-25T02:00:17.833Z An observation made by the writer on the regeneration of polyps in a hydroid, Eudendrium racemosum, at Woods Hole, may be mentioned as an instance of this. Darwin and Modern Science If the stem of this hydroid, which is usually covered with polyps, is put into an aquarium the polyps soon fall off. Darwin and Modern Science This hydroid consists of a long straight main stem which grows vertically upwards and which has at regular intervals very fine and short bristle-like lateral branches, on the upper side of which the polyps grow. Darwin and Modern Science |
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