How To Use Medusoid In A Sentence
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However, this is not statistically significant for the bilaterians and only weakly significant for medusoids.
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A life cycle including both polypoid and medusoid phases that can be separate in space and scarcely overlapping in time characterizes many hydrozoans and most scyphozoans.
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Free-living medusoid hydrozoans can be hard to tell from scyphozoans, but hydrozoan medusae generally have a muscular shelf, or velum, projecting inward from the margin of the bell.
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Even the degeneration of a medusoid from a free-swimming animal to a mere brood-sac (gonophore) is not sudden and saltatory, but occurs by imperceptible modifications throughout hundreds of years, as we can learn from the numerous stages of the process of degeneration persisting at the same time in different species.
Evolution in Modern Thought
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Others appear to have been solitary coelenterate medusoids attached to the sea floor.
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Furnished with these facts, it is not difficult to recognize true beroidal forms in the embryos of sea-urchins and star-fishes, published by Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
Louis Agassiz His Life and Correspondence
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Furnished with these facts, it is not difficult to recognize true beroidal forms in the embryos of sea-urchins and star-fishes, published by Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
Louis Agassiz His Life and Correspondence
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A few, such as Hydra, are solitary polyps that lack a medusoid stage.
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Free-living medusoid hydrozoans can be hard to tell from scyphozoans, but hydrozoan medusae generally have a muscular shelf, or velum, projecting inward from the margin of the bell.
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Although they share traits with the scyphozoans and hydrozoans, cubozoans also possess traits found in neither of the two other medusoid classes.
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Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
Louis Agassiz: His Life and Correspondence
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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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Main Characteristics Radial symmetrical include the hydroids, jellyfish, anemones, and corals have tentacles with stinging cells in their tips which are used to capture and subdue prey one of two basic body types, polypoid or medusoid.
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Muller in his beautiful plates, and thus to trace the medusoid origin of the echinoderms, as the polypoid origin of the medusae has already been recognized.
Louis Agassiz: His Life and Correspondence
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Anthozoan cnidarians lack the medusoid lifestage found in other Cnidaria.
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The trachyline Hydrozoans possess only the medusoid form.
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Even the degeneration of a medusoid from a free-swimming animal to a mere brood-sac (gonophore) is not sudden and saltatory, but occurs by imperceptible modifications throughout hundreds of years, as we can learn from the numerous stages of the process of degeneration persisting at the same time in different species.
Evolution in Modern Thought
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The Scyphozoa, or jellyfish, are an exclusively marine class in which the medusoid stage dominates.
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Some of these medusoid fossils show clear impressions of tentacles around their margins.
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Anthozoan cnidarians lack the medusoid lifestage found in other Cnidaria.
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A few, such as Hydra, are solitary polyps that lack a medusoid stage.
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in some species of coelenterate, polyps are a phase in the life cycle that alternates with a medusoid phase
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Their medusoid bodies are bell-shaped, but some species lack the long, stinging tentacles frequently associated with jellyfish.
Undefined
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The medusoid Aspidella is virtually ubiquitous; Hiemalora, Nemiana, Eoporpita, and Tribrachidium also are distributed in a wide range of facies.
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Hydra never goes through a medusoid stage, and spends its entire life as a polyp.
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Common medusoids and fronds, however, do not generally show this restriction.
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As mentioned above, a few tetraradial ‘medusoids’ could be scyphozoan jellyfish, but tetraradial symmetry is also typical of the Hydrozoa and Cubozoa.
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These are much more restricted in their distribution, possibly because they did not have as much time to disperse as the fronds and medusoids, but probably also because of environmental restrictions on their range.
