单词 | zooid |
例句 | Like a coral reef, it is composed of individual parts, known as zooids, which perform specialized functions. Dancers From the Deep Sea Shine on the U.N. for Climate Week 2021-09-14T04:00:00Z Each siphonophore is a colony of individual zooids, clusters of cells that clone themselves thousands of times to produce an extended, stringlike body. This Might Be the Longest Creature Ever Seen in the Ocean 2020-04-14T04:00:00Z Each siphonophore is made up of many little "zooids," reports LiveScience. ‘Longest animal ever’ discovered off Australia’s coast 2020-04-13T04:00:00Z The creatures, made up of individual zooids - small, multicellular organisms - normally reside in warmer waters, like the tropics, and usually don’t travel farther north than the waters off southern California. Pyrosome population growing again off of Oregon coast 2018-04-22T04:00:00Z A single organism, known as a zooid, is only a fraction of a millimeter. Mysterious, Brain-Like Blob Found in Lagoon 2017-08-31T04:00:00Z Known as pyrosomes, they are tubular colonies of hundreds or thousands of tiny individual creatures called zooids, enmeshed together in a gelatinous tunic roughly the consistency of gummy bear candy. Jellied sea creatures confound scientists, fishermen on U.S. Pacific Coast 2017-06-27T04:00:00Z The colony is made of hundreds to thousands of cloned zooids. A Colonizing Fire of Giant Plankton 2014-08-14T04:00:00Z Growing with one side adherent to a stem; - a term applied to the lateral zooids of corals and other compound animals. Webster's Unabridged Dictionary 2012-03-24T02:00:23.513Z 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 From this bud is developed the first zooid and first serial theca of the colony. Encyclopaedia Britannica, 11th Edition, Volume 12, Slice 3 "Gordon, Lord George" to "Grasses" 2011-11-13T03:00:13.177Z A single zooid of the same. a = nucleus. b = contractile vacuole. c = the characteristic “collar” of naked streaming protoplasm. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z All of these zooids remain embedded in a single gelatinous tunic. A Colonizing Fire of Giant Plankton 2014-08-14T04:00:00Z In the order Stelechotokea the colony consists of a stem formed by a greatly-elongated mother zooid, and the daughter zooids are borne as lateral buds on the stem. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In Autolytus there is, to begin with, a conversion of the posterior half of the body to form a sexual zooid. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" They somewhat resemble the feeding zooids, but are destitute of mouths. The Gutenberg Webster's Unabridged Dictionary Section T, U, V, and W Monad cluster of the same in optical section, showing the relation of the individual monads or flagellate zooids to the stem d. Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 4 "Finland" to "Fleury, Andre" 2011-03-20T02:00:30.697Z Numerous zooids of different kinds are attached to the under side of the float. The Gutenberg Webster's Unabridged Dictionary Section P and Q They resemble and are closely allied to certain families of the Cornulariidae, differing from them only in mode of budding and in the dispostion of the daughter zooids round a central, much-elongated mother zooid. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" But before this separates off a number of other zooids are formed from a zone of budding which appears between the two first-formed individuals. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" 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 Mr. Busk, however, does not know of any gradations now existing between a zooid and an avicularium. The Origin of Species by means of Natural Selection, 6th Edition Some of the zooids have very long tentacles; some have a mouth and digest food; others produce gonophores. The Gutenberg Webster's Unabridged Dictionary Section P and Q The elongation of the mouth and stomodaeum confer a bilateral symmetry on the body of the zooid, which is extended to other organs of the body. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Ultimately, a chain of sexual zooids is thus formed. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" All the zooids of a colony are produced from one primary zooid, by successive buddings. The Gutenberg Webster's Unabridged Dictionary Section F, G and H The latter contains the proximal moieties of the zooids and numerous but separate spicules. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The individuals are round and disk-shaped, with a large zooid in the center of the under side, surrounded by smaller nutritive and reproductive zooids, and by slender dactylozooids near the margin. The Gutenberg Webster's Unabridged Dictionary Section P and Q In Actinians the epithelio-muscular cells of the endoderm are crowded with yellow spherical bodies, which are unicellular plants or Algae, living symbiotically in the tissues of the zooid. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" A given stock only produces zooids of one sex. Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 7 "Cerargyrite" to "Charing Cross" It owes its commercial value to the beauty of its hard red calcareous axis which in life is covered by a cortex in which the proximal moieties of the zooids are imbedded. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The stem represents a greatly enlarged and elongated mother zooid. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The pinnae are formed by the elongated autozooids, whose proximal portions are fused together to form a leaf-like expansion, from the upper edge of which the distal extremities of the zooids project. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Alcyonaria.—In this sub-class the zooid has very constant anatomical characters, differing in some important respects from the Actinian zooid, which has been taken as a type. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" B, Single zooid with the adjacent soft tissues as seen after removal of the skeleton by decalcification. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The structure of the zooid of Heliopora, however, is that of a typical Alcyonarian, and the septa have only a resemblance to, but no real homology with, the similarly named structures in madreporarian corals. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" B, Single zooid and axis of the same magnified. m, Mouth; mf mesenterial filament; ax, axis. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In division a vertical constriction divides a zooid into two equal or unequal parts, and the several parts of the two corals thus produced are severally derived from the corresponding parts of the dividing corallum. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The only exceptions to this structure are found in the arrested or modified zooids, which occur in many of the colonial Alcyonaria. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In colonial corals a bud is always formed from the edge-zone, and this bud develops into a new zooid with its corallum. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Buds arise from the edge-zone which already communicate with the cavity of the zooid by the canals. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" After division the corallites continue to grow upwards, and their zooids may remain united by a bridge of soft tissue or coenosarc. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Thus the coenenchyma forms a stem, sometimes branched, from the surface of which the free portions of the zooids project. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Such modified zooids are called siphonozooids, their function being to drive currents of fluid through the canal-systems of the colonies to which they belong. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Though the corallum appears to live within the zooid, it is morphologically external to it, as is best shown by its developmental history. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The zooid then is, as it were, moulded upon the corallum. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" As the buds develop the canal system becomes much extended, and calcareous tissue is deposited between the network of canals, the confluent edge-zones of mother zooid and bud forming a coenosarc. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Every Alcyonarian colony is developed by budding from a single parent zooid. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In the first-named, the zooids are united only by their bases and the skeleton consists of loose spicules. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" These form a more or less complicated canal system, lined by endoderm, and communicating with the cavities of the zooids. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" The most simple form of budding is found in the genus Cornularia, in which the mother zooid gives off from its base one or more simple radiciform outgrowths. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Each outgrowth contains a single tube or solenium, and at a longer or shorter distance from the mother zooid a daughter zooid is formed as a bud. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" This gives off new outgrowths, and these, branching and anastomosing with one another, may form a network, adhering to stones, corals, or other objects, from which 99 zooids arise at intervals. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In the order Pseudaxonia the colonies are upright and branched, consisting of a number of short zooids whose proximal ends are imbedded in a coenenchyma containing numerous ramifying solenia and spicules. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" Further complications arise when the lower walls of the mother zooid become thickened and interpenetrated with solenia, from which buds are developed, so that lobose, tufted, or branched colonies are formed. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" In the Tubipondae the spicules of the proximal part of the body-wall are fused together to form a firm tube, the corallite, into which the distal part of the zooid can be retracted. Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2 "Anjar" to "Apollo" |
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