How To Use Zooid In A Sentence
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Mr. Busk, however, does not know of any gradations now existing between a zooid and an avicularium.
VII. Miscellaneous Objections to the Theory of Natural Selection
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But look carefully and you will see the tentaculate zooids that confirm their animal nature.
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The body, similar to the zooid of ectoprocts and entoprocts, comprises a cupulate section with a robust attachment.
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Obelia Medusa: Second Generation - The second generation of the obelia life cycle begins when the medusae are released by the gonozooids and become free swimming forms.
Undefined
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These cell masses, known as statoblasts, remain dormant for some time and can withstand drying and freezing; when conditions are favorable, the statoblasts germinates and forms a new zooid.
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I'm not a biologist, but I do read that a zooid is a single cell that can move independently within a larger organism.
Angola, Spare Standards And A Zooid: New Jazz Albums
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Adventitious avicularia and cortical zooidal polymorphs are not apparent.
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In colonial hydroids, the individual polyps, or zooids, are differentiated for different functions: gastrozooids feed, dactylozoids capture prey, and gonozooids give rise to medusoids with gametes.
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The feeding zooids use retractile tentacles, called the lophophore, to filter feed and have a U-shaped gut for digestion.
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They range in size from tiny zooids that live together in large matrix materials to large solitary individuals such as the cunjevoi.
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Uniserial budding produces a chain (runner or branch) one zooid wide, whereas, colonies that are biserial, zooids share one wall and result in a strip two zooids wide.
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It is interesting to see two such widely different organs developed from a common origin; and as the moveable lip of the cell serves as a protection to the zooid, there is no difficulty in believing that all the gradations, by which the lip became converted first into the lower mandible of an avicularium and then into an elongated bristle, likewise served as a protection in different ways and under different circumstances.
VII. Miscellaneous Objections to the Theory of Natural Selection
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Unlike fenestrate bryozoans, in fenestrate graptolites there is only one row of autozooids per branch.
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It is not easy to imagine two objects more widely different in appearance than a bristle or vibraculum, and an avicularium like the head of a bird; yet they are almost certainly homologous and have been developed from the same common source, namely a zooid with its cell.
VII. Miscellaneous Objections to the Theory of Natural Selection
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Mr. Busk, however, does not know of any gradations now existing between a zooid and an avicularium.
VII. Miscellaneous Objections to the Theory of Natural Selection
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The first polypide is formed from a blastema of varying origin, and further zooids in the colony develop through budding.
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Size comparisons between living and extinct hemichordate zooids are not conclusive evidence, however, as it is easy to imagine a small, hypothetical, zooid that possessed multiple tentaculated arms.
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Many dendroid colonies in lower Paleozoic trepostomes developed narrow exozones of young presumably feeding autozooids in cycles that covered growing branch tips.
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For what it's worth, a zooid is ‘an organic cell capable of spontaneous movement independent of the parent organism.’
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The most integrated colonies behave like individual organisms, for the zooids making up the colony are all specialized for certain functions and connected to each other.
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It is interesting to see two such widely different organs developed from a common origin; and as the moveable lip of the cell serves as a protection to the zooid, there is no difficulty in believing that all the gradations, by which the lip became converted first into the lower mandible of an avicularium and then into an elongated bristle, likewise served as a protection in different ways and under different circumstances.
VII. Miscellaneous Objections to the Theory of Natural Selection
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Even in the earliest stages of new growth, complete reversals in budding directions of zooids are evident.
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The shape of the zooid domain in the majority of Dictyonema colonies is highly elliptical, with the long axis of the ellipse perpendicular to the proximodistal axis of the stipe.
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The avicularia, like the vibracula, probably serve for defence, but they also catch and kill small living animals, which it is believed are afterwards swept by the currents within reach of the tentacula of the zooids.
VII. Miscellaneous Objections to the Theory of Natural Selection
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The autozooids are flanked by spines and there are also a few avicularia.
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The unusual ‘sea pansy,’ Renilla, has a primary polyp that is broad and flattened, with autozooids and siphonozooids on the upper surface.
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Dissemination is effected by the agency of water, of air, of animals -- and fruits and seeds are therefore grouped in respect of this as hydrophilous, anemophilous and zooidiophilous.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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As autozooids grew in length, the outermost diaphragms were calcified in sequence as their membranes formed.
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The feeding zooids use retractile tentacles, called the lophophore, to filter feed and have a U-shaped gut for digestion.
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It is not easy to imagine two objects more widely different in appearance than a bristle or vibraculum, and an avicularium like the head of a bird; yet they are almost certainly homologous and have been developed from the same common source, namely a zooid with its cell.
VII. Miscellaneous Objections to the Theory of Natural Selection
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The skeletal morphology of monticular zooids in H. portelli suggests that specialized male polymorphs may not have evolved by Late Eocene times.
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Enlarged avicularia on zooids at row bifurcations, on branch margins, and adjacent to ovicells are generally similar to those in M. auriculatum.
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Avicularia are small heterozooids in which the zooecium and operculum form a beak-like, snapping structure that deters small predators.
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The individuals of the colony are called zooids and many zooids with individual siphonal openings cover the surface of the colony.
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Dissemination is effected by the agency of water, of air, of animals -- and fruits and seeds are therefore grouped in respect of this as hydrophilous, anemophilous and zooidiophilous.
Encyclopaedia Britannica, 11th Edition, Volume 2, Part 1, Slice 1
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When the limits of the substrate have been reached, a Hydractinia colony will bud reproductive polyps called gonozooids from the stolonal mat.
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Even in the earliest stages of new growth, complete reversals in budding directions of zooids are evident.
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Further, older autozooids in major proximal regions of some large dendroid colonies stopped growing skeletons outwardly as distal colony growth continued.
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They may be polymorphic with ovicells, vibracula, kenozooids, and/or avicularia in addition to autozooids.
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[12] The spermatozooids of certain plants can be strongly attracted towards a pipette which is filled with malic acid -- crowding around and into it with avidity.
Darwin, and After Darwin (Vol. 1 and 3, of 3) An Exposition of the Darwinian Theory and a Discussion of Post-Darwinian Questions
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The autozooids have small apertures and often preserve long peristomes inclined at an acute angle to the colony surface.
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These are marine bryozoans with tubular zooids with strongly calcified walls.
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Autozooidal apertures are oval and aligned in raised, radial rows diverging from depressed maculae; they are sometimes connate but more usually separated from adjacent apertures.
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The vibracula may have been directly developed from the lips of the cells, without having passed through the avicularian stage; but it seems more probable that they have passed through this stage, as during the early stages of the transformation, the other parts of the cell with the included zooid could hardly have disappeared at once.
VII. Miscellaneous Objections to the Theory of Natural Selection
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1 Each such zooid in these pelagic colonial hydroids or hydrozoans has a high degree of specialization and, although structurally similar to other solitary animals, are all attached to each other and physiologically integrated rather than living independently.
Pounding The Rock
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The avicularia are believed by Mr. Busk, Dr. Smitt, and Dr. Nitschenaturalists who have carefully studied this groupto be homologous with the zooids and their cells which compose the zoöphyte; the moveable lip or lid of the cell corresponding with the lower and moveable mandible of the avicularium.
VII. Miscellaneous Objections to the Theory of Natural Selection
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The body of the zooid and tunic is transparent enough for the observation of heartbeats.
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In Ectoprocta there are similar specialized zooids, avacularia, vibracula, and gonozooids.
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Each individual, or zooid, is enclosed in a sheath of tissue, the zooecium, that in many species secretes a rigid skeleton of calcium carbonate.
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Such zooids are specialised to such an extent that they lack the structures associated with other functions and are therefore dependent for survival on the others to do what the particular zooid cannot do by itself.
Pounding The Rock
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Other zooids include the avicularia, where the operculum has been modified into a jaw, and the vibracula where the operculum has been modified into a bristle.