How To Use Hydrozoan In A Sentence
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Moore and Harrington regarded Sphenothallus as a hydrozoan or scyphozoan.
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Yet another hypothesis for the origin of the mesoderm from the subumbrellar epithelium of a hydrozoan medusa buds has been recently advanced.
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Other colonial hydrozoans, such as the chondrophorines and siphonophorans, are pelagic; many of these have developed internal gas-filled floats as an aid to buoyancy.
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In some cases, gene relationships among cnidarian groups are congruent with the species phylogeny: hydrozoan sequences are sister-group to scyphozoan sequences, with anthozoan sequences branching basally to this ensemble.
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It is a widespread Paleozoic marine taxon that has been interpreted most recently as a tubiculous annelid or other ‘worm’ or as a thecate hydrozoan or scyphozoan cnidarian.
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While a few hydrozoans, such as Hydra, are solitary polyps, most live in colonies made up of anywhere from a few to thousands of individual polyps.
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Sphenothallus Hall, 1847 is a widespread Paleozoic marine taxon that has been interpreted most recently as a tubiculous annelid or other ‘worm’ or as a thecate hydrozoan or scyphozoan cnidarian.
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Scyphozoan medusae differ from those of hydrozoans in lacking a velum.
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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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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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Evolutionary developmental innovations important for colonial integration have evolved independently in many colonial hydrozoans, and are displayed both in Hydractinia and in more advanced forms of siphonophores.
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No fossils in the California Permian collection, other than the ‘hydrozoan’ described here, show a close affinity to Tethyan forms.
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Hatchlings will feed on macroplankton, small snails, crustaceans and other invertebrates such as hydrozoans and jellies.
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One of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan.
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In turn, anthozoan species seem to have lost their group A HOX9-14 gene (present in hydrozoans; inconclusive data for scyphozoans; figure 1).
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Porpita is a member of a small but very widespread group of hydrozoan cnidarians, the Chondrophorina.
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The life cycles of the hydrozoans P. carnea (B) and Hydractinia echinata (C) and a representative anthozoan (D).
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Most hydrozoans alternate between a polyp and a medusa stage - they spend part of their lives as ‘jellyfish’ which are hard to distinguish from scyphozoan jellyfish.
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There are three subgroups within the cnidarians that have medusae, cubozoans, hydrozoans, and 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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Many hydrozoan species perform large vertical diel migrations, which may bring individuals together in spawning aggregations.
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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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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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Most hydrozoans alternate between a polyp and a medusa stage - they spend part of their lives as ‘jellyfish’ which are hard to distinguish from scyphozoan jellyfish.
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One of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan.
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Neuronal GSX expression, as reported from several hydrozoan and anthozoan species, is clearly more significant.
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Hydra magnipapillata full genome and have not been identified until now in other hydrozoan or scyphozoan species, being only known from the anthozoan
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Hydra magnipapillata full genome and have not been identified until now in other hydrozoan or scyphozoan species, being only known from the anthozoan
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When Wotton in 1552 gave to anthozoan corals and gorgonians, and hydrozoans the name Zoophyte, it was because of their morphological similarity to higher plants.
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In Hydrozoans the same orthologous six genes are required for eye regeneration as in planarians, and in the box jellyfish Tripedalia a pax B gene, which may be a precursor of Pax6, was found to be expressed in the eyes.
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In the former, cleavage gives rise to a hollow blastula, which is filled in to a greater or lesser extent by the unipolar immigration of cells, much as occurs in hydrozoan cnidarians.
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In some cases, gene relationships among cnidarian groups are congruent with the species phylogeny: hydrozoan sequences are sister-group to scyphozoan sequences, with anthozoan sequences branching basally to this ensemble.
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Most hydrozoans alternate between a polyp and a medusa stage - they spend part of their lives as ‘jellyfish’ which are hard to distinguish from scyphozoan jellyfish.
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Jellyfish (medusae, which may be hydrozoan, scyphozoan or cubozoan) are important both as predators and prey in pelagic ecosystems.
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Getting hooked up with an animal like Donax seemed a very clever trick of hydrozoan evolution.
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There are three subgroups within the cnidarians that have medusae, cubozoans, hydrozoans, and scyphozoans.
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The pinnacle of hydrozoan colonial complexity can be found in members of the Family Siphonophora.
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The difference between most hydrozoans and most scyphozoans is that in hydrozoans, the polyp stage usually predominates, with the medusa small or sometimes absent.
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Although we cannot completely exclude a nonbiological or nonmetazoan origin, we identified what appear to be modern cnidarian developmental stages, including both anthozoan planula larvae and hydrozoan embryos.
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Scyphozoan medusae differ from those of hydrozoans in lacking a velum.
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Hydrozoan colonies display a diverse array of forms.
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Chondrophorines were once classified with another unusual group of hydrozoans, the siphonophores.
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The trachyline Hydrozoans possess only the medusoid form.
