| 单词 | lancelet |
| 例句 | Four more lines are drawn parallel to the lancelet line; each of these lines starts further up the right arm of the V than the next. Fundamentals of Biology 2015-01-01T00:00:00Z During embryonic development, what features do we share with tunicates or lancelets? Concepts of Biology 2013-04-25T00:00:00Z Vertebrata is a larger clade that also includes fish, lamprey, and lancelets. Biology for AP Courses 2022-06-09T00:00:00Z A few aquatic chordates, including lancelets, some amphibians, and some sea snakes, rely on gas exchange by diffusion across body surfaces. Miller & Levine Biology 2018-01-01T00:00:00Z 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 If the answer is no, a branch leads downward to lancelet. Fundamentals of Biology 2015-01-01T00:00:00Z A few living invertebrates, such as worm-like animals called lancelets, are closely related to vertebrates, but our ancestors split off from theirs more than 600 million years ago. A Long-Ago Ancestor: A Little Fish, With Incipient Jaws 2014-06-11T04:00:00Z The lancelet branched off first, followed by the shark, then the frog, then the snake and then the ostrich. Biology for AP Courses 2022-06-09T00:00:00Z Aglow under the sea In 2007, a different group of researchers found a fluorescent protein in the lancelet, a tiny somewhat eel-like marine creature closely related to vertebrates. First Fluorescent Protein Identified in a Vertebrate Animal 2013-06-13T20:45:00.327Z 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 The illustration shows the V-shaped Vertebrata clade, which includes lancelets, lampreys, fish, lizards, rabbits, and humans. Fundamentals of Biology 2015-01-01T00:00:00Z The lancelet, one of the closest living vertebrate cousins, gets by with only one. Thanks to Extra Genes, Eels Transform from Ribbons to Tubes 2012-03-14T21:45:00.247Z The lancelet branched off first, followed by the shark, then the ostrich, then the snake and then the frog. Biology for AP Courses 2022-06-09T00:00:00Z Amphioxus, am-fī-oks′us, n. the lancelet, one of the lowest backboned animals, found on the sandy coasts of warm and temperate seas. Chambers's Twentieth Century Dictionary (part 1 of 4: A-D) 2011-10-11T02:01:08.990Z Into this the cerebral vesicle of the larval lancelet opens. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z Extant members of Cephalochordata are the lancelets, named for their blade-like shape. Fundamentals of Biology 2015-01-01T00:00:00Z An acorn-tongued worm, a lancelet, a lamprey, a shark, and a perch. A Guide for the Study of Animals 2011-01-18T03:00:14.913Z The lancelet is a chordate, fish-like filter feeder that buries itself in marine sands. Biology for AP Courses 2022-06-09T00:00:00Z These early predecessors of man, thus seen in the dim recesses of time, must have been as lowly organised as the lancelet or amphioxus, or even still more lowly organised. The Descent of Man and Selection in Relation to Sex, Vol. I 2011-01-17T03:00:49.523Z In this, as in the case of the eye, the lancelet is lower than the ascidians, the insects, crustaceans, and many molluscs. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z The illustration shows a lancelet with a head protruding form the sand, and the rest of the body buried. Fundamentals of Biology 2015-01-01T00:00:00Z It is still more remarkable than the amphioxus or lancelet, which has been long known. 1931: A Glance at the Twentieth Century Molecular studies of fruit fly, lancelet, human, and nematode show that homologous genes, when present, are strongly conserved. Biology for AP Courses 2022-06-09T00:00:00Z By "launces" the writer meant what we should now call the lancelet. The Cornwall Coast The human heart may present in degenerates all types from the pulsating vessel found in the lancelet up to that of the mammal. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z This gap was filled some years ago by the discovery of the lancelet—Amphioxus—and the young of the sea-squirt—Ascidia. The World's Greatest Books — Volume 15 — Science In the transition that once took place from one species of ascidian larva to a form similar to the lancelet fish, he sees the new branch diverging in the series of vertebrates. The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality In an alternative model, insects are included with lancelet and human in a superphylum called the Coelomata, and the nematode is separate. Biology for AP Courses 2022-06-09T00:00:00Z We cannot suppose these to be nearly the earliest fishes, especially as the two lowest orders, now represented by the Amphioxus or lancelet and the lampreys, have not yet been found fossil. Darwinism (1889) As the head end of the spinal cord of the lancelet developed, the cartilage enclosing it developed to protect it. Degeneracy Its Causes, Signs and Results 2011-05-02T02:00:17.657Z The lancelet has a slender rod of cartilage along its back, and corresponds very closely with the ideal I have sketched of our primitive backboned ancestor. The World's Greatest Books — Volume 15 — Science II, � 1 and � 2 we have already referred to the value which Darwin, and more especially H�ckel, lays on the relationship of the larva of the ascidia to the lancelet fish. The Theories of Darwin and Their Relation to Philosophy, Religion, and Morality The shark branched off first, followed by the lancelet, then the frog, then the ostrich and then the snake. Biology for AP Courses 2022-06-09T00:00:00Z Both Darwin's vertebral plexus, and Herbert Spencer's "line of individuation," must begin with the lancelet and its disputed head, and end in the Catarrhine or Old World monkey. Life: Its True Genesis Transverse section of the lancelet, in the fore half. The Evolution of Man — Volume 2 All the lower vertebrates, the lancelets, lampreys, and fishes, are constantly taking in water at the mouth, and letting it out again by the lateral clefts of the gullet. The Evolution of Man — Volume 1 These early ancestors of man, thus seen in the dim recesses of time, must have been as simply, or even still more simply organised than the lancelet or amphioxus. The Descent of Man Man is at the highest summit, the lancelet at the lowest root, of the vertebrate stem. The Evolution of Man — Volume 2 We begin with the lancelet—after man the most important and interesting of all animals. The Evolution of Man — Volume 2 Especially in the lowest of all the vertebrates, the lancelet or Amphioxus, we have the oldest stem-forms completely preserved in the embryonic development. The Evolution of Man — Volume 2 The outer form of our hypothetical primitive vertebrate was at all events very simple, and probably more or less similar to that of the lancelet. The Evolution of Man — Volume 1 Goodsir, Prof., on the affinity of the lancelet to the ascidians. The Descent of Man But they are far below the true fishes, and form a very interesting connecting-group between them and the lancelet. The Evolution of Man — Volume 2 This one lowest vertebrate that merits the closest study—undoubtedly the most interesting of all the vertebrates after man—is the famous lancelet or amphioxus, to which we have already often referred. The Evolution of Man — Volume 1 Johannes Muller classed the lancelet with the fishes, although he pointed out that the differences between this simple vertebrate and the lowest fishes are much greater than between the fishes and the amphibia. The Evolution of Man — Volume 2 It must, therefore, be our next task to make a comparative study of the various forms of vertebrate gastrulation, and trace them backwards to that of the lancelet. The Evolution of Man — Volume 1 Hence we must once more thoroughly understand the palingenetic embryonic features of the lancelet before we go on to consider the cenogenetic forms of the craniota. The Evolution of Man — Volume 1 Later it approaches very closely, at one period, to the anatomic structure of the lancelet, afterwards to that of a fish, and again to the typical build of the amphibia and mammals. The Evolution of Man — Volume 1 |
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