单词 | tunicate |
例句 | Photo A shows tunicates, which are sponge-like in appearance and have holes along the surface. Fundamentals of Biology 2015-01-01T00:00:00Z Most tunicates live on the ocean floor and are suspension feeders. Concepts of Biology 2013-04-25T00:00:00Z The team eventually settled on three possibilities: a soft species of coral, a sea sponge or a marine invertebrate called a tunicate. American ocean explorers discover unknown blue organism on seafloor southwest of St. Croix 2022-09-06T04:00:00Z The researchers were interested in tunicates because they filter-feed on plankton by continuously drawing water through their barrel-shaped bodies. Hope for New Drugs Arises from the Sea 2022-08-27T04:00:00Z They found that the ancestors of one group of palaemonid shrimp had all once lived inside ascidians, a group of tubular filter-feeding organisms that includes tunicates and sea squirts. These symbiotic shrimp ‘speed date’ to find new hosts 2022-05-25T04:00:00Z Illustration C shows an adult tunicate, which resembles a tree stump anchored to the bottom. Fundamentals of Biology 2015-01-01T00:00:00Z Tunicate larvae hatch from eggs inside the adult tunicate’s body. Concepts of Biology 2013-04-25T00:00:00Z It belongs to a larger group of invertebrate animals that are closely related to all vertebrates: the tunicates. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z The researchers identified other parallels between the tunicate and vertebrate immune systems. This strange marine creature has an immune system remarkably similar to ours 2018-12-05T05:00:00Z Along with tunicates and lancelets, these include hagfish, lampreys and marine worms called hemichordates. The backbone begins: a spine-tingling story 2018-07-02T04:00:00Z The name tunicate derives from the cellulose-like carbohydrate material, called the tunic, which covers the outer body of tunicates. Fundamentals of Biology 2015-01-01T00:00:00Z After hatching, a tunicate larva swims for a few days until it finds a suitable surface on which it can attach, usually in a dark or shaded location. Concepts of Biology 2013-04-25T00:00:00Z The vast majority of adult tunicates sit on the bottom of the ocean and pump water into their mouth to filter feed; they do not come with a food-collection apparatus outside the body. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z Another way in which the tunicates’ immune system mirrors the vertebrate version involves cells that are specialized to kill other cells. This strange marine creature has an immune system remarkably similar to ours 2018-12-05T05:00:00Z Having sketched that picture, he traces the evolution of definitive vertebrate characteristics by mining rich new studies from neglected chordate groups, from lancelets and tunicates to hagfish and lampreys. The backbone begins: a spine-tingling story 2018-07-02T04:00:00Z Illustration B shows the tunicate larval stage, which resembles a tadpole, with a post anal tail at the narrow end. Fundamentals of Biology 2015-01-01T00:00:00Z Most tunicates live a sessile existence in shallow ocean waters and are suspension feeders. Concepts of Biology 2013-04-25T00:00:00Z In fact, many tunicates decide cell fates extremely early in development. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z As the scientists report online today in Nature, tunicates also deploy such cell executioners. This strange marine creature has an immune system remarkably similar to ours 2018-12-05T05:00:00Z The predatory tunicate waits for its prey, then envelopes its next meal using its entire body. 10 Stunning Undersea Creatures That Don't Even Look Real 2016-06-03T04:00:00Z Bulbs, such as a scaly bulb in lilies and a tunicate bulb in daffodils, are other common examples. Fundamentals of Biology 2015-01-01T00:00:00Z Sessile adult tunicates lose the notochord; what does this suggest about one function of this structure? Concepts of Biology 2013-04-25T00:00:00Z “This appears to have given tunicates a lot of flexibility to go evolving into outer space,” Holland says, referring to their unusual body forms and ecologies. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z When the researchers staged fights in the lab dish between cells from different tunicates, they found that the bodies piled up. This strange marine creature has an immune system remarkably similar to ours 2018-12-05T05:00:00Z Salps are part of a group called tunicates, says Madin, a tunicate specialist. Mysterious Balls of Goo Are Rolling Onto American Beaches 2015-07-22T04:00:00Z In contrast, a new algae, or tunicate, or bristleworm might require months of careful study to distinguish it from other known species. The Richest Reef: Time to Call It a Day 2015-06-30T04:00:00Z During embryonic development, what features do we share with tunicates or lancelets? Concepts of Biology 2013-04-25T00:00:00Z It was therefore likely that the ancestral tunicate still underwent metamorphosis and had a sessile adult stage before the gene losses that resulted in a new type of heart, the researchers argued. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z The golden star tunicate may look like a flower, but this marine invertebrate is a brawler, attacking its tunicate neighbors in melees that feature ferocious cell-to-cell combat. This strange marine creature has an immune system remarkably similar to ours 2018-12-05T05:00:00Z From left to right: wing of a large marsh grasshopper, brittle star and vase tunicate sections. A Museum Chapel for Microscopic Biodiversity 2013-03-01T16:15:03.220Z When a ship docks, the tunicates reproduce in new waters, leaving their larvae to colonize the area. Green Blog: Marine Invaders, Coming to a Coast Near You 2012-03-13T14:17:26Z The name tunicate derives from the cellulose-like carbohydrate material, called the tunic, which covers the outer body. Concepts of Biology 2013-04-25T00:00:00Z Other tunicates, too, have undergone many radical gene losses and genome rearrangements. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z Stomach content data indicates that fish and tunicates are eaten as well, sometimes, in some places. Grampus griseus joins the globicephalines 2012-02-27T21:15:05.413Z An aptitude for reproduction like that in plants exists in many cœlenterates, worms, and tunicates. The Biological Problem of To-day Preformation Or Epigenesis? The Basis of a Theory of Organic Development 2011-08-29T02:01:04.170Z The tunicate genome contains a few other golden nuggets of information as well, including clues about how introns form. Big Reveals for Genome of Tiny Animal 2010-11-24T16:19:00Z The primary foods of tunicates are plankton and detritus. Concepts of Biology 2013-04-25T00:00:00Z “Therefore, we can’t be sure what the ancestor of tunicates looked like,” Holland says. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z In 1851 two very important memoirs were published in the Transactions of the Royal Society, which contained the results of Huxley's observations of the interesting animals known as "tunicates." Thomas Henry Huxley; A Sketch Of His Life And Work But if we make a jump, say to the tunicate mollusks, we see no reason there to infer the existence of consciousness at all. An Introduction to Philosophy But we will pass over these cases in order to dwell more particularly on the remarkable tunicate known as Pyrosoma, a name indicative of its phosphorescent property, being derived from two Greek words signifying fire-body. Young Folks' Library, Volume XI (of 20) Wonders of Earth, Sea and Sky The other organs of the young tunicate are all of vertebral type. Composition-Rhetoric Even if the ancestral tunicate remains a mystery, Oikopleura demonstrates that when genes go missing, their absence can sometimes lead to evolutionary innovations, such as this creature’s baroque but ultimately successful way of life. A Strange Creature Discards Genes to Make a Better Heart 2022-02-03T05:00:00Z It is also found to a slight extent in certain animals, as the tunicates. The Gutenberg Webster's Unabridged Dictionary Section C The tunicates are the only class of animals that have a real cellulose or woody coat. The Evolution of Man — Volume 2 The amphioxus reveals the great secret of the origin of the vertebrates from the invertebrate vermalia, and in its development and structure connects directly with certain lower tunicates, the ascidia. The Evolution of Man — Volume 1 Coelomation takes place with equal clearness and transparency in the case of the amphioxus, the lowest vertebrate, and its nearest relatives, the invertebrate tunicates, the sea-squirts. The Evolution of Man — Volume 1 In particular, the indefatigable Russian zoologist, Kowalevsky, found them in all the most diverse sections of the invertebrates—the worms, tunicates, echinoderms, molluscs, articulates, etc. The Evolution of Man — Volume 1 |
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